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Journal articles on the topic 'Seedling water'
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1
Struve, Daniel, Petra Sternberg, Nick Drunasky, Kurt Bresko, and Rico Gonzalez. "Growth and Water Use Characteristics of Six Eastern North American Oak (Quercus) Species and the Implications for Urban Forestry." Arboriculture & Urban Forestry 32, no. 5 (2006): 202–13. http://dx.doi.org/10.48044/jauf.2006.026.
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Seedling growth and water use of six North American oak species were studied in a series of four experiments to determine inter- and intraspecies water use characteristics. Xeric-site adapted species (chestnut oak, Q. prinus [L.] and black oak, Q. velutina [Lamb.]) had slower growth (height and dry weight accumulation and lower shoot:root ratios) than mesic-site adapted species (bur oak, Quercus macrocarpus [Michx.]; pin oak, Q. palustris [Muenchh.], northern red oak, Q. rubra [L]; and Shumard oak, Q. shumardii [Buckl.]). Principal component analysis (a statistical technique used to identify correlated variables) using 11 variables found that seedling water use loaded positively with seedling growth factors (taller seedlings tended to have higher dry weights and greater leaf and root areas and used more water than shorter seedlings, which tended to have lower dry weights, smaller leaf, and root areas) in the first principal component. However, in the third experiment, seedling growth factors loaded negatively with seedling water use for Q. prinus. Tall Q. prinus seedlings tended to use less water than short seedlings. However, other measures of water use (g water cm −1height and cm −2leaf and root area) loaded negatively on the first principal component. Correlations between seedling heights and seedling waters use were significant and positive, but great within-species and within half-sib family differences in height-adjusted water use (g water cm −1height) were found. By plotting height-adjusted water use against seedling height, efficient and inefficient water use seedlings could be identified. Inefficient water use seedlings were shorter and had higher water use cm −1height than efficient water use seedlings. Inefficient water use seedlings were described as having a xeric-water use habit, whereas tall seedlings had a mesic-water use habit. Potentially, height-adjusted water use could be used as a method for selecting individual oak seedlings better adapted to stressful urban planting sites.
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Ross, Darrell W., and C. Wayne Berisford. "Nantucket Pine Tip Moth (Lepidoptera: Tortricidae) Response to Water and Nutrient Status of Loblolly Pine." Forest Science 36, no. 3 (1990): 719–33. http://dx.doi.org/10.1093/forestscience/36.3.719.
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Abstract Loblolly pine (Pinus taeda L.) seedlings were grown in a greenhouse under conditions of variable water and nutrient availability and then exposed to natural populations of the Nantucket pine tip moth (Rhyacionia frustrana [Comstock]). Seedling growth was directly related to water and nutrient availability. Tip moth oviposition was highest on the most vigorous seedlings, even after accounting for differences in seedling size among treatments. The ratios of mean number of pupae per seedling to mean number of eggs per seedling for each treatment indicated percent tip moth survival may have been lower on vigorous seedlings than on stressed seedlings, but differences may have been due to factors other than the suitability of seedlings as larval food. Larger numbers of heavier pupae developed on vigorous seedlings than on stressed seedlings. Pupal weights were directly related to total nitrogen concentration and inversely related to total phenolic and condensed tannin concentrations of pine shoot tissues. Total phenolic and condensed tannin concentrations were inversely related to seedling growth. These results suggest that tip moth populations will increase rapidly following silvicultural treatments that increase water and nutrients available to young loblolly pines. For. Sci. 36(3):719-733.
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Song, Yong Xian, Juan Li Ma, and Xian Jin Zhang. "Design of Water and Fertilizer Measurement and Control System for Seedlings Soil Based on Wireless Sensor Networks." Applied Mechanics and Materials 241-244 (December 2012): 86–91. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.86.
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Water and fertilizer are two important factors in seedlings growth and development, the reasonable management of water and fertilizer can play a greater growth potential for seedling, and blind management of water and Fertilizer not only is harmful for seedling growth, but also will lead to the water resource waste and environmental pollution. In order to precisely determine the seedlings fertilizer demand, this paper presents a method seedlings fertilizer and water measurement and control system based on wireless sensor network, the system can realize automatic deployment of information acquisition node, data self-organization transfer, namely, wireless communication, and can accurately detect information of soil water and fertilizer and identify water and Fertilizer on the best demand of seedlings growth stages for different seedlings, different regions, different period of climate and seedling growth status, so the best water and fertilizer control is achieved in seedling cultivation. This system were introduced and analyzed from the hardware structure, software structure and so on in this paper, and it has the advantages of low power consumption, low cost, good robustness, flexibility and so on. The experiment results shown that the system is practical and efficient, which can be applied in farmland, and nursery area.
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Samuelson, Lisa J., and John R. Seiler. "Interactive Role of Elevated CO2, Nutrient Limitations, and Water Stress in the Growth Responses of Red Spruce Seedlings." Forest Science 39, no. 2 (1993): 348–58. http://dx.doi.org/10.1093/forestscience/39.2.348.
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Abstract Red spruce (Picea rubens Sarg.) seedlings were grown from seed for 5 mo in ambient (362 ppm) or elevated (711 ppm) CO2 to determine the potential effect of an increase in global CO2 concentration on seedling growth and establishment. CO2 exposure treatments were crossed with two levels of soil fertility and water stress treatments to determine if seedling dry weight, size, and fixed growth responses to elevated CO2 depended on nutrient and water supply. Seedling dry weight and size responses to elevated CO2 at 5 mo did not depend on nutrient and water supply. Seedlings grown in both soil fertility treatments and water stress treatments responded similarly to CO2 treatment. Water stress and CO2 treatments did have an interactive influence on the fixed growth potential of the terminal leader. Leaf weight, leaf area, and height of the terminal leader of water-stressed seedlings were greater in seedlings exposed to elevated CO2 during budset than seedlings exposed to ambient CO2. Total new fixed growth (lateral plus terminal) and total terminal fixed growth (leaf plus stem) were greater in seedlings that formed shoot primordia in elevated CO2 than in ambient CO2. Red spruce seedlings grown in elevated CO2 for 5 mo had greater stem diameter, height, branching density, leaf weight, root weight, stem weight, total weight, and mean relative growth rate (RGR) from 3 to 5 mo than seedlings grown in ambient CO2. Red spruce seedling responses to elevated CO2 suggest that seedling establishment in natural environments may be enhanced when ambient CO2 concentrations rise even if water and nutrient availabilities are limited. FOR. SCI. 39(2):348-358.
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Abdelmalik, Abdelmalik M. "Enhanced Growth and Drought Resistance in Seedlings of Acacia tortilis due to Inoculation of Arbuscular Mycorrhiza Fungi and Bacillus subtilis." International Journal of Agriculture and Biology 26, no. 06 (2021): 750–60. http://dx.doi.org/10.17957/ijab/15.1891.
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A shade house experiment was conducted in Saudi Arabia to evaluate the impact of a mixture of three arbuscular mycorrhiza fungi (AMF) namely Funneliformis mosseae, Rhizophagus intraradices and Claroideoglomus etunicatum, a bacterium Bacillus subtilis, and their combinations on the growth and drought resistance potential of Acacia torilis seedlings under moderate and water deficit-stress. Thus, inoculants treatments (AMF, Bacillus subtilis, AMF+Bacillus, and control) and several watering intervals (1, 2, 3 and 4 weeks) were applied. Inoculation of AMF and Bacillus to A. tortilis seedlings found effective in terms of improved seedling growth. AMF and combined inoculation resulted in a larger shoot (shoot fresh and dry weights, seedling height, leaf number, leaf area) and root development (root fresh and dry weights, root length, root surface area, and root volume) as compared to the non-inoculated seedlings. Single inoculants of B. subtilis, showed better improvement in 1- and 2-week watering intervals compared to the control. Inoculated seedlings showed lower proline accumulation than non-inoculated seedlings, and thus improved seedling resistance to water deficit-stress. Mycorrhizal and mixed inoculation enhanced the amount of chlorophyll in the seedling’s leaves. Furthermore, seedlings with AMF and co-inoculants showed better drought tolerance even at 3- and 4-week watering intervals. © 2021 Friends Science Publishers
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Selahvarzi, Bahareh, and Seyed Mohsen Hosseini. "Survival, growth and mineral accumulation in ash Fraxinus excelsior L. seedlings irrigated with water treatment effluent." Folia Forestalia Polonica, Series A - Forestry 54(3) (September 1, 2012): 159–68. https://doi.org/10.5281/zenodo.30841.
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A pot experiment was carried out to study the effect of irrigation with water treatment effluent on the growth and chemical constituents of ash seedlings Fraxinus excelsior L. according as soil chemical properties. This research was conducted at the site near to the Eastern Tehran water treatment plant. Ash seedling were planted in pots in three score rows After measuring their primary dimensions, the seedlings were irrigated with water treatment effluent, well water and water mix (50% well water + 50% water treatment effluent) for the period of April–October 2010. Three replications were considered for each of the score rows. During the entire period of observations, survival and growth parameters of three random seedling samples from each treatment were measured once in two months until the end of the growth season (October 2010). Observations included seedling height, collar diameter and survival. Application of water treatment effluent, well water and water mix indicated same seedling survival but water treatment effluent was superior than other treatments in improving seedling growth parameters (height, collar diameter and biomass dry weight) as well as it brought about the highest concentration of N, P, K and Mg in plant parts, when compared with mix water and well water treatments.
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Svenson, Sven E. "Shading and DCPTA Interactively Influence Shoot Growth of Hypoestes." HortScience 30, no. 4 (1995): 854D—854. http://dx.doi.org/10.21273/hortsci.30.4.854d.
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The objective of this study was to determine if shading and DCPTA application interactively influence seedling emergence and shoot growth of Hypoestes phyllostachya Bak. seedlings. Hypoestes `Carmine Red' seeds were soaked for 6 h in distilled water, and then soaked 6 h in solutions containing' 10 mg DCPTA/liter (30 mM) and 0.1% Tween-80, 0.1% Tween-80, or distilled water. Date of seedling emergence was recorded after sowing (0.5 cm) in 9-cm (460 ml) pots filled with 440 ml of a 5 pine bark: 4 Florida sedge peat: 1 sand medium. Forty pots from each of the three seed-soak treatments were grown under 30%, 63%, or 84% shading, provided by saran-type shadecloth, using natural photoperiods (completely randomized design). Shoot heights and dry weights were recorded 75 days after sowing. Neither shading nor DCPTA influenced total seedling emergence or seedling emergence rate (time to 50% emergence). Under 30% shading, seedlings from DCPTA-treated seeds were taller and had more shoot dry weight than seedlings from surfactant- or water-treated-seeds; however, DCPTA did not influence seedling height or shoot weight under 63% or 84% shading.
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Zhang, Bingchao, Xiangyu Wen, Yongshuang Wen, et al. "Design and Testing of a Closed Multi-Channel Air-Blowing Seedling Pick-Up Device for an Automatic Vegetable Transplanter." Agriculture 14, no. 10 (2024): 1688. http://dx.doi.org/10.3390/agriculture14101688.
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In this study, a closed multi-channel air-blowing plug seedling pick-up device and a combined plug tray were designed to address the issues of complex structure, high seedling damage rates and low pick-up efficiency in fully automated vegetable transplanter systems. The device operates by sealing the plug seedlings in a seedling cup, where compressed air is channeled into the sealed cavity through multiple passages during the seedling pick-up process. The upper surface of the seedling plug is subjected to uniform force, overcoming the friction and adhesion between the plug seedlings and the tray. This process presses the seedlings into the guide tube, completing the pick-up operation. A mechanical model for the plug seedlings was developed, and the kinetics of the pick-up process were analyzed. The multi-channel high-pressure airflow was simulated and evaluated, identifying three key parameters affecting seedling pick-up performance: water content of the seedling plug, air pressure during pick-up, and air-blowing duration. Using these factors as variables, and with seedling pick-up rate and substrate loss rate as evaluation indicators, single-factor experiments and a three-factor, three-level orthogonal experiment were conducted. The experiments’ results showed that the best seedling pick-up performance was achieved when the water content of the plug was 20%, the air pressure was 0.3 MPa, and the air-blowing time was 30 ms. Under these conditions, the seedling pick-up success rate was 97.22%, and the substrate loss rate was 10.46%.
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Grauke, L. J., and Richard D. O'Barr. "Initial Survival of Pecan Grafts on Seedling Rootstock of Pecan, Water Hickory, and their Interspecific Hybrid." HortTechnology 6, no. 1 (1996): 45–48. http://dx.doi.org/10.21273/horttech.6.1.45.
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`Oconee' pecan [Carya illinoinensis (Wangenh.) K. Koch] scions were grafted on seedling rootstock from nine open-pollinated seedstocks. Rootstock included three seedstocks each of pecan, water hickory [C. aquatica (F. Michx.) Nutt.], and their interspecific hybrid, Carya × lecontei (Little). Pecan seedlings had the largest basal diameters and water hickory seedlings the smallest. Seedlings of `Elliott' and `Curtis' seedstocks were larger than seedlings from `Moore' seedstock. Pecan and C. × lecontei seedlings were grafted more successfully than water hickory. Graft success varied among seedstocks of pecan and C. × lecontei Foliage color of seedlings, possibly indicative of iron nutritional status, was influenced by species; pecan seedling leaves were darker green than those of water hickory seedlings, but similar to C. × lecontei leaves. `Oconee' scion leaves were darker green on pecan rootstock than when grafted on C. × lecontei rootstock.
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Kerr, Kelly L., Nicole Zenes, Anna T. Trugman, and William R. L. Anderegg. "Testing the effects of species interactions and water limitation on tree seedling biomass allocation and physiology." Tree Physiology 41, no. 8 (2021): 1323–35. http://dx.doi.org/10.1093/treephys/tpab005.
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Abstract Species interactions mediate tree responses to water limitation because competition and/or facilitation alter plant physiology and growth. However, because it is difficult to isolate the effects of plant–plant interactions and water limitation from other environmental factors, the mechanisms underlying tree physiology and growth in coexisting plants under drought are poorly understood. We investigated how species interactions and water limitation impact the physiology and growth of trembling aspen (Populus tremuloides), narrowleaf cottonwood (Populus angustifolia) and ponderosa pine (Pinus ponderosa) seedlings in a controlled environment growth chamber, using aspen as a focal species. Seedlings were grown in pots alone or with a con- or hetero-specific seedling, and were subjected to a water limitation treatment. Growth, water status and physiological traits were measured before, during and after the treatment. Under well-watered conditions, the presence of another seedling affected growth or biomass allocation in all species, but did not impact the physiological traits we measured. Under water limitation, the presence of a competing seedling had a marginal impact on seedling growth and physiological traits in all species. Throughout the study, the magnitude and direction of seedling responses were complex and often species-specific. Our study serves as an important step toward testing how species’ interactions modify physiological responses and growth in well-watered and water-limited periods.
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Blain, Dominique, and Martin Kellman. "The effect of water supply on tree seed germination and seedling survival in a tropical seasonal forest in Veracruz, Mexico." Journal of Tropical Ecology 7, no. 1 (1991): 69–83. http://dx.doi.org/10.1017/s0266467400005101.
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ABSTRACTIn Iropical seasonal forests, mass seedling death may incidentally occur early in the rainy season following untimely germination provoked by an isolated heavy rainfall. We hypothesized that, in a soil with little moisture retention capacity, irregular rainfall patterns would result in large fluctuations of water supply and, in the early wet season, drought episodes could cause seedling death. This hypothesis was tested in a seasonal tropical forest in Mexico where seedling density is low and the soil consists of almost pure sand with a low water retention capacity. Various patterns of simulated rainfall were applied in the forest to seeds and seedlings of three common tree species. Overall very little difference in germination and seedling survival was observed between the various rainfall treatments. The results showed that rainfall patterns and the soil texture may interact in a much more complex way than was initially hypothesized, and that water availability to seeds and seedlings is not necessarily predictable. The absence of seedlings of the three tree species might be better explained by high seed predation and low light level in the understorey.
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Johnsen, Kurt H. "Growth and ecophysiological responses of black spruce seedlings to elevated CO2 under varied water and nutrient additions." Canadian Journal of Forest Research 23, no. 6 (1993): 1033–42. http://dx.doi.org/10.1139/x93-132.
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Two controlled-environment studies examined growth and ecophysiological responses of black spruce (Piceamariana (Mill.) B.S.P.) seedlings to elevated CO2 under varied water and nutrient additions. Growth analyses were conducted followed by measurements of gas exchange, xylem pressure potential and foliar N concentrations. Growth under elevated CO2 (700 ppm) increased final seedling dry weights by 20–48% compared with seedling growth under ambient CO2 (350 ppm). Percent increases in seedling dry weight were greater under drought versus well-watered conditions and higher versus lower nutrient additions. Seedlings grown under elevated CO2 displayed higher water use efficiency than seedlings grown under ambient CO2. This was apparent based upon instantaneous gas exchange as well as xylem potential pressure measurements. Elevated CO2-induced stimulation of relative growth rate was greatest shortly after seedling emergence and decreased with increased seedling size. Acclimation of net photosynthesis was observed and was reversible. Analyses using allometric principles indicate net photosynthetic acclimation resulted from: (i) growth-induced nutrient dilution; (ii) a decrease in foliar N levels not owing to dilution; and (iii) a decrease in net photosynthetic activity.
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Wallstedt, Anna, Andrew Coughlan, Alison D. Munson, Marie-Charlotte Nilsson, and Hank A. Margolis. "Mechanisms of interaction between Kalmia angustifolia cover and Picea mariana seedlings." Canadian Journal of Forest Research 32, no. 11 (2002): 2022–31. http://dx.doi.org/10.1139/x02-124.
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Sites dominated by Kalmia angustifolia L. are often associated with slow decomposition of organic matter, decreased nitrogen (N) mineralization rates, and low black spruce (Picea mariana (Mill.) BSP) productivity. The objective of this study was to separate the effects of belowground competition by Kalmia from the effects of water-soluble soil phenols on black spruce seedlings growing under different levels of Kalmia cover. A factorial greenhouse bioassay was established in which black spruce seedlings were grown for 6 months in intact blocks of soil with three different levels of Kalmia cover. The soil was treated with charcoal to reduce the amounts of water-soluble phenols, and (or) tubes were inserted to exclude Kalmia roots. At low Kalmia cover, reducing the level of belowground competition increased seedling biomass by 134%. However, reducing belowground competition did not increase seedling biomass at the two higher levels of Kalmia cover. It is possible that seedling biomass remained low because of an increased immobilization of N in the organic layer. Furthermore, the proportion of ectomycorrhiza morphotypes differed among seedlings growing under different levels of Kalmia cover. The effect of water-soluble phenols on seedling growth remains uncertain, since we observed a confounding effect of the charcoal treatment on soil microbial biomass and seedling response.
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Peng, Fei, Wataru Tsuji, Tao Wang, and Atsushi Tsunekawa. "Effects of Sand Burial and Water Regimes on Seed Germination and Seedling Emergence of Two Desert Species." Advanced Materials Research 356-360 (October 2011): 2465–72. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.2465.
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Reaumuria songarica (Pall.) Maxim and Nitraria tangutorum Bobr. are two species growing on nebkhas in dune system. But N. tangutorum distributes more widely than R. songarica does. Sand burial and drought are two major disturbing factors in the field. Experiments were conducted under controlled conditions to investigate sand burial depth and simulated precipitation amount on seed germination, seedling emergence and seedling mass of the two shrubs to explain the dominance of N. tangutorum over R. songarica. Seeds were buried at 6 depths (0, 0.5, 1.5, 3, 5, 8 cm) and irrigated with 3 water regimes (5, 7, 10 mm) in plastic pots (8 cm in diameter and 11 cm in height) under the same light intensity and alternating temperature in an environment controlled growth chamber. R. songarica has a greater germination percentage than N. tangutorum under each burial depth with any water regime. R songarica seed germination increased with burial depth at each water regime and when depth is deeper than 1.5 cm all the seeds germinated under 7 and 10 mm water treatment. N. tangutorum seed germination increased until an optimal burial depth and then decreased. The optimal burial depth shifts with water regime. Seedling emergence of R songarica did not occur at depth deeper than 1.5 cm under any water regime. N. tangutorum seedling emergence maximized at 3, 1.5 and 0.5 cm with 5, 7 and 10 mm water supply regime respectively. Under all the treatments, N. tangutorum seedlings had larger dry mass than R. songarica seedlings. Higher N. tangutorum seedling emergence percentage and seedling mass with given water supply enhance its possibility to appear on nebkhas in the study area.
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Jiménez-Arias, David, Sarai Morales-Sierra, Andrés A. Borges, Antonio J. Herrera, and Juan C. Luis. "New Biostimulants Screening Method for Crop Seedlings under Water Deficit Stress." Agronomy 12, no. 3 (2022): 728. http://dx.doi.org/10.3390/agronomy12030728.
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Biostimulants can be used in many crops growing under water deficit conditions at the seedling stage. This study used tomato, Solanum lycopersicum L., seedlings growing in commercial 150-cell trays as an experimental setup to reproduce mild drought stress effects. The method showed significant reductions in seedling growth and RGR (25%) after a seven-day experiment. Gas exchange parameters (Pn, Gs and E) had significantly lower values (30–50%) than the control seedlings. Stress-related metabolite, ABA, exhibited a significant accumulation in the tomato seedlings (24 h), consistent with SINCED2 gene expression. Proline levels were twice as high in the water-deficit treated seedlings, remaining at this level until the end of the experiment. However, total carbohydrates were significantly lower in water-deficit treated seedlings. Qualitative and quantitative analysis suggested that using the variable ‘seedling biomass accumulation’ could simplify the methodology. Twelve different biostimulants were assayed, implementing this simplification, and all of them showed higher biomass accumulation in the treated seedlings than in the non-treated ones under water deficit. Among them, putrescine, spermine and spermidine were the most effective. The method is adjustable to different biostimulant volumes (1, 3 and 5 mL; 1 mM BABA), with no significant differences between the treatments.
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Augustine, Steven P., and Keith Reinhardt. "Differences in morphological and physiological plasticity in two species of first-year conifer seedlings exposed to drought result in distinct survivorship patterns." Tree Physiology 39, no. 8 (2019): 1446–60. http://dx.doi.org/10.1093/treephys/tpz048.
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Abstract First-year tree seedlings represent a critical demographic life stage, functioning as a bottleneck to forest regeneration. Knowledge of how mortality is related to whole-seedling carbon and water relations is deficient and is required to understand how forest compositions will be altered in future climatic conditions. We performed a greenhouse drought experiment using first-year seedlings of two common pine species found in the Intermountain West, USA. Gas exchange, biomass gain, allometry and xylem water potentials were compared between well-watered and droughted seedlings from emergence until drought-induced mortality. In both species, morphological adjustments to confer drought tolerance, such as increased leaf mass per unit area, were not observed in seedlings exposed to drought, and droughted seedlings maintained photosynthesis and whole-seedling carbon gain well into the experiment. Yet, there were important differences between species in terms of carbon budgets, physiological responses and mortality patterns. In Pinus ponderosa P. & C. Lawson, physiological acclimation to drought was much greater, evident through stronger stomatal regulation and increased water-use efficiency. Photosynthesis and carbon budgets in P. ponderosa were greater than in Pinus contorta Dougl. ex. Loud., and survival was 100% until critical hydraulic thresholds in leaf water content and seedling water potentials were crossed. In P. contorta, physiological adjustments to drought were less, and mortality occurred much sooner and well before injurious hydraulic thresholds were approached. First-year conifer seedlings appear canalized for a suite of functional traits that prioritize short-term carbon gain over long-term drought tolerance, suggesting that conifer seedling survival is linked with carbon limitations, even during drought, with survival in species having narrower carbon survival margins being more hampered by carbon limitations.
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Wolken, Jane M., Simon M. Landhäusser, Victor J. Lieffers, and Uldis Silins. "Seedling growth and water use of boreal conifers across different temperatures and near-flooded soil conditions." Canadian Journal of Forest Research 41, no. 12 (2011): 2292–300. http://dx.doi.org/10.1139/x11-136.
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To test the hypothesis that seedling growth and water use increase with soil temperature and improved soil aeration and vary with species, we evaluated the above- and below-ground growth and water use of seedlings of four northern boreal conifer species: black spruce ( Picea mariana (Mill.) B.S.P.), white spruce ( Picea glauca (Moench) Voss), tamarack ( Larix laricina (Du Roi) K. Koch), and lodgepole pine (Pinus contorta Dougl. ex Loud.) grown under different temperature and near-flooded soil conditions. Seedlings were grown in specialized pots that maintained the water table level at either 15 cm (high water table treatment: very wet) or 30 cm (low water table treatment: moderately wet) below the soil surface, and whole-seedling transpiration was assessed. Soil temperature (5, 10, or 20 °C) was controlled with a water bath surrounding the pots. Although some species were sensitive to the high water table treatment, soil temperature was the driver of seedling growth and water use. We ranked the ability of the seedlings of the species to tolerate the cold soil conditions examined as black spruce > lodgepole pine > tamarack > white spruce. The ranking of the ability to tolerate near-flooded conditions was tamarack and lodgepole pine > black spruce > white spruce.
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Mao, Hanping, Guoxin Ma, Luhua Han, Jianping Hu, Feng Gao, and Yang Liu. "A whole row automatic pick-up device using air force to blow out vegetable plug seedlings." Spanish Journal of Agricultural Research 18, no. 4 (2021): e0211. http://dx.doi.org/10.5424/sjar/2020184-17003.
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Aim of study: To develop a whole row automatic pick-up device using air force to blow out plug seedlings, to avoid the damage to seedlings that the current way of seedling picking by needle insertion induces.Area of study: Jiangsu Province, China.Material and methods: We designed a pick-up device which mainly consists of a seedling transporting device, a seedling air loosening device, a seedling clamping device and an automatic control system. The damage rate of seedling was significantly reduced and the success rate of seedling picking was increased by using the new seedling air loosening method and the new designed end-effectors. A prototype of the new pick-up device was produced according to the calculation results, and the performance tests were arranged under actual production conditions in an indoor laboratory.Main results: The calculation showed that when the diameter of the blowhole in air nozzle is 3.5 mm, and the air pressure is between 0.146 MPa and 0.315 MPa, the seedlings can be blown out successfully. Besides, the clamping strain test showed that the new designed end-effector can meet the requirements of seedling picking. The orthogonal test showed that both the air pressure and water content significantly affected the success ratio. The success ratio reached 96.64% when air pressure was 0.4 MPa, water content was 55%-60% and airflow rate was 100%, what meets the current requirements of transplanting.Research highlights: This research can provide some references for the automatic transplanting technology.
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Chun, S. C., and R. W. Schneider. "Sites of Infection by Pythium Species in Rice Seedlings and Effects of Plant Age and Water Depth on Disease Development." Phytopathology® 88, no. 12 (1998): 1255–61. http://dx.doi.org/10.1094/phyto.1998.88.12.1255.
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Seedling disease, caused primarily by several species of Pythium, is one of the major constraints to water-seeded rice production in Louisiana. The disease, also known as water-mold disease, seed rot, and seedling damping-off, causes stand reductions and growth abnormalities. In severe cases, fields must be replanted, which may result in delayed harvests and reduced yields. To develop more effective disease management tactics including biological control, this study was conducted primarily to determine sites of infection in seeds and seedlings; effect of plant age on susceptibility to P. arrhenomanes, P. myriotylum, and P. dissotocum; and minimum exposure times required for infection and seedling death. In addition, the effect of water depth on seedling disease was investigated. Infection rates of seed embryos were significantly higher than those of endosperms for all three Pythium spp. The development of roots from dry-seeded seedlings was significantly reduced by P. arrhenomanes and P. myriotylum at 5 days after planting compared with that of roots from noninoculated controls. Susceptibility of rice to all three species was sharply reduced within 2 to 6 days after planting, and seedlings were completely resistant at 8 days after planting. There was a steep reduction in emergence through the flood water, relative to the noninoculated control, following 2 to 3 days of exposure to inoculum of P. arrhenomanes and P. myriotylum. In contrast, P. dissotocum was much less virulent and required longer exposure times to cause irreversible seedling damage. Disease incidence was higher when seeds were planted into deeper water, implying that seedlings become resistant after they emerge through the flood water. These results suggest that disease control tactics including flood water management need to be employed for a very short period of time after planting. Also, given that the embryo is the primary site of infection and it is susceptible for only a few days, the disease should be amenable to biological control.
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Rosmala, Arrin, Selvy Isnaeni, and Roza Yunita. "Optimizing the Growth of Tasikmalaya Honje (Etlingera elatior) Accession Seeds by Implementing Fermentation of Rabbit Urine and Coconut Water." JERAMI : Indonesian Journal of Crop Science 6, no. 1 (2023): 14–20. http://dx.doi.org/10.25077/jijcs.6.1.14-20.2023.
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Organic matter has an important role besides providing macro and micro nutrients to plants, it can also improve environmental quality. The fermentation of rabbit urine and coconut water is expected to optimise the growth of honje seedlings. The aim of this study was to determine the concentration of fermented rabbit urine and coconut water that can optimise the growth of honje seedlings of Tasikmalaya accession. The study used a completely randomised design with seven treatments, namely A = control, B = 25% rabbit urine fermentation, C = 50% rabbit urine fermentation, D = 25% coconut water, E = 25% rabbit urine fermentation + 25% coconut water, F = 50% rabbit urine fermentation + 25% coconut water, G = 50% rabbit urine fermentation + 50% coconut water. The results showed that the treatments gave significantly different results on shoot emergence, seedling height, seedling diameter, and root crown ratio. Treatment G produced the fastest shoot emergence (6 days), and plant height (10.4 cm). Meanwhile, the widest seedling diameter was produced by treatment B (4.4cm), C (3.9 cm), and treatment G (3.9cm). Treatment C produced the highest root crown ratio of 0.5.
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da Silva, Richardson Barbosa Gomes, Danilo Simões, Ivar Wendling, et al. "Leaf Angle as a Criterion for Optimizing Irrigation in Forest Nurseries: Impacts on Physiological Seedling Quality and Performance after Planting in Pots." Forests 14, no. 5 (2023): 1042. http://dx.doi.org/10.3390/f14051042.
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Seedling species with different architectures, e.g., mean leaf angles, are often subjected to the same irrigation management in forest nurseries, resulting in wasted water and fertilizer and reduced seedling quality. We aimed to evaluate whether irrigation volumes applied to tree seedling species with different leaf angles affect the physiological quality in forest nurseries and, consequently, performance after potting. We submitted nine seedling species with different mean leaf angles to four daily water regimes (8, 10, 12, and 14 mm). In the nursery, the following physiological attributes were considered to assess seedling quality: leaf water potential, daily transpiration rate, SPAD value, chlorophyll a and b, anthocyanins, carotenoids, and total nutrient content. After potting, we evaluated height and stem diameter over 120 days. Leaf angle can be used as a criterion for optimizing irrigation in forest nurseries, avoiding water and fertilizer wastage, and increasing physiological seedling quality. Leaf angle measurements combined with concurrent assessments of leaf traits are helpful in further understanding the effects of leaf angle variation and water regime on seedling quality. For positive leaf angles, an irrigation volume of 8 mm is sufficient to increase physiological seedling quality. Conversely, seedlings with negative leaf angles show the opposite response, requiring the largest irrigation volume (14 mm) to increase physiological seedling quality, except when the mean leaf area is small and concentrated in the upper half of the stem, which facilitates the access of irrigation water to the substrate and thus satisfies seedling water requirements. For all species, up to 120 days after planting in pots, the effect of the irrigation volume that provides greater growth and physiological quality at the end of the nursery phase is not overcome by other irrigation volumes applied.
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Moe, Roar, John E. Erwin, and Will Carlson. "Factors Affecting Gerebera jamesonii Early Seedling Branching and Mortality." HortTechnology 6, no. 1 (1996): 59–61. http://dx.doi.org/10.21273/horttech.6.1.59.
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The role of irradiance and/or ethylene in inducing mortality and self-branching disorders in Gerbera jamesonii Bolus. seedlings was studied. Seedling mortality increased from 8% to 57% when seed was covered with vermiculite than left uncovered during germination. Supplemental lighting for 30 days after germination decreased seedling mortality and decreased the time to visible bud compared to seed germinated under natural light only. In subsequent experiments, seeds were germinated and then seedlings were water logged or sprayed with ethephon (0.69, 3.45, or 17.25 mM) at four different stages of seedling development. Half of the ethephon-treated seedlings were sprayed with silver thiosulfate (STS). Seedling mortality was greatest after cotyledon expansion but before expansion of the first tree leaf. The highest ethephon concentration caused reduced seedling dry weight after 42 days. Applying STS did not overcome self-branching or meristem necrosis.
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Livingston, N. J., and T. A. Black. "The growth and water use of three species of conifer seedlings planted on a high-elevation south-facing clearcut." Canadian Journal of Forest Research 18, no. 10 (1988): 1234–42. http://dx.doi.org/10.1139/x88-190.
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Container-grown 1-0 seedlings of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco), western hemlock (Tsugaheterophylla (Raf.) Sarg.), and Pacific silver fir (Abiesamabilis (Dougl.) Forbes) were spring planted on a south-facing high-elevation clearcut located on Mount Arrowsmith, Vancouver Island, British Columbia, and their growth and development was measured over three successive growing seasons. Treatments designed to modify seedling microclimate, including provision of shade cards, irrigation, and irrigation and shade cards combined, had a marked effect on the extent and type of growth in all species. Irrigated seedlings had the largest shoot dry masses and the highest shoot to root dry mass ratios. Shaded seedlings had larger shoots than untreated seedlings, which had the lowest shoot to root dry mass ratios. All seedlings showed a pronounced decline in seasonal growth 1 year after planting. Douglas-fir seedlings exhibited a high degree of drought tolerance; in the driest year there was only a 20% difference in total dry matter production between irrigated and nonirrigated seedlings. Western hemlock and Pacific silver fir seedlings, despite not being drought tolerant, expended water to achieve growth and thereby exposed themselves to desiccation. Measurements of growing-season seedling dry matter production were better related to estimates of growing-season transpiration, obtained by summing the products of seedling leaf area, hourly D/(RvT′), where D is vapour pressure deficit, Rv is the gas constant for water vapour, and T′ is the absolute air temperature, and stomatal conductance derived from a boundary-line analysis model, than to estimates of growing-season average total seedling canopy conductance, i.e., the average of the products of seedling leaf area and stomatal conductance.
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Paine, C. E. Timothy, Kyle E. Harms, and Jesús Ramos. "Supplemental irrigation increases seedling performance and diversity in a tropical forest." Journal of Tropical Ecology 25, no. 2 (2009): 171–80. http://dx.doi.org/10.1017/s0266467408005798.
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Abstract:Diversity is positively correlated with water availability at global, continental and regional scales. With the objective of better understanding the mechanisms that drive these relationships, we investigated the degree to which variation in water availability affects the performance (recruitment, growth and survival) of juvenile trees. Precipitation was supplemented throughout two dry seasons in a seasonal moist forest in south-eastern Peru. Supplementing precipitation by 160 mm mo−1, we increased soil moisture by 17%. To generate seedling communities of known species composition, we sowed 3840 seeds of 12 species. We monitored the fates of the 554 seedlings recruited from the sown seeds, as well as 1856 older non-sown seedlings (10 cm ≤ height < 50 cm), and 2353 saplings (> 1 m tall). Watering significantly enhanced young seedling growth and survival, increasing stem density and diversity. Watering diminished the recruitment of species associated with upland forests, but increased the survival of both upland- and lowland-associated species. Though supplemental watering increased the growth of older seedlings, their density and diversity were unaffected. Sapling performance was insensitive to watering. We infer that variation in dry-season water availability may affect seedling community structure by differentially affecting recruitment and increasing overall survival. These results suggest that differential seedling recruitment and survival may contribute to the observed relationships between water availability, habitat associations and patterns of tree species richness.
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Oshima, Chiaki, Yuji Tokumoto, and Michiko Nakagawa. "Biotic and abiotic drivers of dipterocarp seedling survival following mast fruiting in Malaysian Borneo." Journal of Tropical Ecology 31, no. 2 (2014): 129–37. http://dx.doi.org/10.1017/s026646741400073x.
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Abstract:South-East Asian tropical rain forests experience sporadic, but profuse, seed production after general flowering, leading to the synchronous emergence of various seedlings and subsequent seedling dynamics, which play a crucial role in determining species distribution and coexistence. We examined the relative importance of both biotic (initial height, conspecific seedling density) and abiotic (canopy openness, per cent sand, soil water content) drivers using survival data for 1842 seedlings of 12 dipterocarp species for 1.5 y following mast fruiting in an old-growth Bornean tropical rain forest. More than 30% of all dipterocarp seedlings survived 1.5 y after mast fruiting. When all species were analysed together, we found that initial seedling height, canopy openness and conspecific seedling density affected dipterocarp seedling survival. Negative density dependence indicated that predators were not satiated, but dipterocarp seedlings rather suffered from host-specific natural enemies or intraspecific competition. Species-level analyses of seven dipterocarp species showed large variation in response to biotic and abiotic factors. These results suggest that interspecific differences in the relative importance of biotic and abiotic effects on seedling survival might contribute to species coexistence.
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Kulkarni, Manoj G., Glendon D. Ascough, and Johannes Van Staden. "Effects of Foliar Applications of Smoke-Water and a Smoke-isolated Butenolide on Seedling Growth of Okra and Tomato." HortScience 42, no. 1 (2007): 179–82. http://dx.doi.org/10.21273/hortsci.42.1.179.
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The ecologic significance of smoke-related seed germination is now well recognized. Consequently, smoke solutions and a pure butenolide, the active compound from smoke that stimulates germination of a number of plant species, show great potential for enhancing the growth of vegetable crops. Achieving maximum production and better and faster growth of the seedlings has always been a priority for vegetable growers. This study therefore highlights the effects of foliar application of smoke-water and a butenolide on seedling growth of okra [Abelmoschus esculentus (L.) Moench] and tomato (Lycopersicon esculentum Mill.). Treating okra seedlings with smoke-water (1:500 v/v) showed a significant (P < 0.05) increase in shoot/root length, shoot fresh/dry weight, number of leaves, total leaf area, and stem thickness compared with the control treatment. Treatment of okra seedlings with smoke-water significantly (P < 0.05) increased the absolute growth rate (AGR) per week. However, the seedling vigor index (SVI) did not improve as a result of no change in root fresh weight. On the other hand, foliar application of smoke-water and butenolide showed a pronounced effect on the seedling growth of tomato. Most of the growth parameters examined for both the treatments were significantly (P < 0.05) increased, resulting in a significantly (P < 0.05) higher SVI and AGR than the control. This study indicates that the foliar application of smoke-water or butenolide may be a useful and inexpensive technique for enhancing seedling growth of vegetable crops.
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E’rahim, Nur Izzah Khadijah, Mohd Shukor Nordin, and Mohd Syahmi Salleh. "EFFECTS OF SEED PRIMING ON SEED GERMINATION AND EARLY SEEDLING GROWTH OF CHILI (CAPSICUM ANNUM L.) UNDER WATER DEFICIT CONDITION." Tropical Agrobiodiversity 2, no. 1 (2021): 37–41. http://dx.doi.org/10.26480/trab.01.2021.37.41.
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Seed priming may improve seed germination and early seedling growth of plants under water deficit condition. The present study was conducted to investigate the effects of seed priming on the germination and early seedling growth of chili under water deficit condition and to identify the optimum rate of seed priming for higher seed germination and early seedling growth. The water deficit stress level towards early seedling growth also been identified. The priming treatments involved were non-priming as control, and priming with gibberellic acid (GA3) at 5 mg/L, 10 mg/L and 15 mg/L. Seed germination experiment was conducted using wet-tissue method for seven days duration. Germination percentage, germination index and seedling vigour index were recorded in the seed germination experiment. The germinated seeds were then sown and grown under five different levels of water deficit treatment in accordance with the frequency of watering mainly watering 8 times (S1), 4 times (S2), 2 times (S3), once (S4), and not watered (S5), in a duration of 14 days. The early seedling growth performance was based on plant height, and root length. Seed germination and early seedling growth performance of 5 mg/L GA3 primed seeds was significantly better as compared to other seed priming treatments. In addition, the S1 and S2 could be regarded as non-stress condition, S3 and S4 as mild to moderate stress and S5 as severe stress since all seedlings were not survived under S5 condition. In general, S2 was found to be the optimum watering treatment as it recorded the highest plant height and root length of the seedlings.
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Sucoff, Edward, Cindy Buschena, and Perry Tamte. "Desiccation and water potentials in the roots, leaves, and shoots of bare-root red pine and white spruce." Canadian Journal of Forest Research 15, no. 5 (1985): 989–92. http://dx.doi.org/10.1139/x85-157.
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Bare-root seedlings of red pine (Pinusresinosa Ait.) and white spruce (Piceaglauca (Moench) Voss) were dried in various controlled situations before measurement of water potential (ψ) and moisture contents. For each situation, root ψ was directly proportional to and highly correlated with shoot ψ. The regression lines did not vary with environment for fully exposed seedlings within a seedling lot. Regressions did differ between seedling lots and between seedlings that had roots only, shoots only, or both roots and shoots exposed. Since the differences between root and shoot ψ were sometimes large and roots are more likely to be damaged by a given level of desiccation during handling, we suggest that root ψ may be the preferred predictor of postplanting seedling behavior.
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ZIA, Yusra, Muhammad Zafar IQBAL, and Muhammad SHAFIQ. "THE EFFECTS OF AUTOMOBILE MOTOR WORKSHOP WASTE WATER ON SEEDLING GROWTH OF KIDNEY BEAN AND MUNG BEAN CROPS UNDER ABIOTIC STRESS." Journal of Plant Development 29, no. 1 (2022): 133–40. http://dx.doi.org/10.47743/jpd.2022.29.1.881.
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The waste water generation from the automobile motor workshop activities are responsible for environmental degradation in the form of water pollution and showed variable impact on plant growth. This paper gives information, assessment and screening about the effect of motor work shop waste water on seedling growth of two different types of legume bean crops namely, kidney bean (Phaseolus vulgaris L.) and mung bean (Vigna radiata (L.) R. Wilkczek) in pot culture experiments. The results showed that the increase in treatment of 25%, 50%, 75%, and 100% of motor workshop waste water decreased the root, seedling length, number of leaflets, shoot, leaves dry weight and root/shoot ratio of common bean as compared to control. The waste water treatment of 25% significantly (p<0.05) decreased root growth performance and leaves dry weight of common bean as compared to control. The treatment of polluted water produced beneficial and harmful effects on root, shoot length, seedling size, number of leaves, leaf area and biomass production of mung bean. The treatment of waste water at 25% significantly (p<0.05) decreased shoot length, leaf area, shoot dry weight, specific leaf area and leaf area ratio as compared to control. Increase in concentrations of polluted water at 50% significantly effects seedling length, specific leaf area and leaf rea ratio of polluted water on mung bean. The seedlings of P. vulgaris and V. radiata tested different percentage of tolerance to waste water treatment and found high in control treatment. The results showed that seedlings of P. vulgaris showed lowest (32.59%) percentage of tolerance to high concentration (100%) of polluted waste water treatment of workshop. The treatment of polluted water at 25, 50, 75 and 100% decreased the tolerance indices values in seedlings of V. radiata by 104.35, 83.37, 67.63 and 63.16 percent as compared to control. The decrease in seedling growth of growth parameter of P. vulgaris in this study revealed that it was might be due to abiotic stress produced by waste water. The chemical analysis of waste water showed gradually increase values of pH (7.61-9.32), electrical conductivity (0.56-2.62 mScm-1), chloride (13.60-50.96 mgL-1) and CaCO3 (45.90-65.21 mgL-1) as compared to control.
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Yeiser, J. L., and J. L. Paschke. "Regenerating Wet Sites with Bare-Root and Containerized Loblolly Pine Seedlings¹." Southern Journal of Applied Forestry 11, no. 1 (1987): 52–56. http://dx.doi.org/10.1093/sjaf/11.1.52.
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Abstract Seedling survival on a 1983 planted test site with a perched water table was 99% for both containerized and bare-root seedlings planted in May after the perched water table receded and 15% for seedlings planted in February while soils were saturated. Also, differences in survival forMay 1984 plantings on an upland flatwoods site, a terrace along an ephemeral stream, and a river floodplain site, indicate that each site possesses inherent properties uniquely influencing seedling survival. After the perched water table had receded, first-year mean survival of containerized seedlings was 19% higher than for bare-root seedlings. Some families showed tolerance to excessive soil moisture and are probably well suited for general planting on wet sites. The higher cost of containerized seedlings can be justified if a replant or marginal survival can be avoided. SouthJ. Appl. For. 11(1): 52-56.
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Nuryawan, A., S. Fatimah, K. S. Hartini, and N. Masruchin. "Experimental study on the utilization of residue from particleboard’s recycling activity." IOP Conference Series: Earth and Environmental Science 912, no. 1 (2021): 012069. http://dx.doi.org/10.1088/1755-1315/912/1/012069.
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Abstract Both solid and liquid residues derived from activity of particleboard (PB)’srecycling were investigated. The solid was attempted to make recycle particleboard (rPB) while the liquid was tried to use as fertilizer to seedling of Acacia crassicarpa. Objective of this study was to compare quality between PB and rPB and to evaluate seedling growth of A.crassicarpa exposed to liquid disposal from PB’s recycling activity. Methods of this study were consisted of testing of physical and mechanicalproperties of industrial PB, manufacturing rPB, and comparing the properties between PB and rPB. Prior to manufacture rPB, liquid disposal from PB’s recycling activity was released through water immersion of industrial waste’s PB comprised of predominant trimming residues. The liquid disposal was measured its nitrogen (N) content and then it was kept in a gallon for further use as fertilizer. Observation on growth parameters (height, diameter, leaves number and seedling’s strength) of both treated and untreated seedlings was conducted weekly for 2 months. Results of this study showed: 1)rPB was feasible to be produced but their quality was slightly decreased. 2) Liquid disposal during cyclist test and water immersion of PB’s residues contained 0.69% N. 3) Growth parameters of A.crassicarpa seedling showed response positively and significant statistically between treated and untreated seedlings. These findings suggested that both residues originated from PB’s recycling can be utilized further; the solid can be used as raw material of rPB while the liquid can be utilized as fertilizer to seedlings.
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Puentes-Marín, Juliana, Andrés González-Melo, Beatriz Salgado-Negret, et al. "Wood Anatomical and Demographic Similarities Between Self-Standing Liana and Tree Seedlings in Tropical Dry Forests of Colombia." Plants 13, no. 21 (2024): 3023. http://dx.doi.org/10.3390/plants13213023.
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Canopy lianas differ considerably from trees in terms of wood anatomical structure, and they are suggested to have a demographic advantage—faster growth and higher survival—than trees. However, it remains unclear whether these anatomical and demographic differences persist at the seedling stage, when most liana species are self-standing and, consequently, might be ecologically similar to trees. We assessed how self-standing liana and tree seedlings differ in relation to wood anatomy, growth, and survival. We measured 12 wood traits and monitored seedling growth and survival over one year for 10 self-supporting liana and 10 tree seedling species from three tropical dry forests in Colombia. Liana and tree seedlings exhibited similar survival rates and wood anatomies for traits related to water storage and mechanical support. Yet, for traits associated with water transport, liana seedlings showed greater variability in vessel lumen size, while tree seedlings had higher vessel density. Also, the liana relative growth rate was significantly higher than for trees. These results indicate that, while self-supporting liana and tree seedlings are anatomically similar in terms of mechanical support and water storage—likely contributing to their similar survival rates—liana seedlings have a growth advantage, possibly due to more efficient water transport. These findings suggest that the well-documented anatomical and demographic differences between adult lianas and trees may depend on the liana’s developmental stage, with more efficient water transport emerging as a key trait from early stages.
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Singh, N. B., and Nimisha Amist. "Interactive Effects of Cinnamic Acid and Water Stress on Wheat Seedlings." INTERNATIONAL JOURNAL OF PLANT AND ENVIRONMENT 4, no. 01 (2018): 105–12. http://dx.doi.org/10.18811/ijpen.v4i01.11616.
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In the present study we compared the effects of allelochemical with water stress (WS) on growth, biochemical parameters and responses of antioxidative enzymes in wheat seedlings. The wheat seedlings were treated with 0.5, 1.0 and 1.5 mM concentrations of cinnamic acid (CA) with and without water stress by withholding water supply for 5 days. Leaf water status, photosynthetic pigments, protein content, amount of proline and nitrate reductase (NR) and antioxidant enzymes activities were examined. CA resulted in reduction of seedling height with drastic decrease in stressed seedlings. The combined treatments CA+WS further decreased the seedling height. The same result was registered for seedlings dry weight, relative water content and pigment and protein contents. Total soluble sugar content and nitrate reductase activity were variedly affected under all treatments. Proline content and lipid peroxidation increased. Activity of superoxide dismutase increased significantly (less than 0.05) while catalase P activity was lower in all treatments. Ascorbate peroxidase and guaiacol peroxidase activities were higher as compared with catalase which showed protection of wheat seedlings from oxidative stress. Water stress elevated the toxic effect of allelochemical.
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Karl, Michael G., and Paul S. Doescher. "Regulating Competition on Conifer Plantations with Prescribed Cattle Grazing." Forest Science 39, no. 3 (1993): 405–18. http://dx.doi.org/10.1093/forestscience/39.3.405.
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Abstract On conifer plantations, competitive understory vegetation often retards growth and establishment of tree seedlings. Livestock grazing exemplifies a method of controlling the understory vegetation and increasing the availability of site resources to tree seedlings. We hypothesized that prescribed cattle grazing ameliorates water stress of young tree seedlings by reducing root growth of competing understory species. On a Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) and ponderosa pine (Pinus ponderosa Dougl.) plantation in southwest Oregon planted in 1986, seedling water stress was evaluated with the pressure chamber technique and supplemented with gravimetric soil water determinations in 1986-1989. Root growth of orchardgrass (Dactylis glomerata L.), the major understory competing species, was quantified in 1988 and 1989 with the root periscope/mini-rhizotron technique. Seedling water stress levels during spring and summer were similar in a cattle-grazed vs. ungrazed area in 1986 through 1988, but in summer 1989, water stress was reduced significantly in the grazed area. Soil water content was higher in the grazed area in 1989, especially at the 10-20 cm soil depth. End of season (July) orchardgrass root growth was reduced 18% and 15% with grazing in 1988 and 1989, respectively. We conclude that repeated cattle grazing of orchardgrass reduced transpirational surface area and root growth sufficiently to increase soil water availability to seedlings. Thus, prescribed cattle grazing on conifer plantations can enhance seedling physiological status by acting as a regulator of above- and belowground competition. For. Sci. 39(3):405-418.
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Sana Shazia, Noor-un-Nisa Memon, Niyaz Ahmed Wahocho, et al. "COMPARATIVE EFFECT OF HYDRO AND HALOPRIMING ON SEED GERMINATION AND SEEDLING GROWTH OF IPIL IPIL (Leucaena leucocephala)." Pakistan Journal of Biotechnology 21, no. 1 (2024): 141–47. http://dx.doi.org/10.34016/pjbt.2024.21.01.856.
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An experiment was conducted during the year 2020 to investigate the comparative effect of hydro and halopriming on seed germination and seedling growth of Ipil Ipil. The seeds of Ipil Ipil were primed in various solutions for 30 hours. The seeds were soaked in priming solutions viz. distilled water, luke warm water, NaCl solution @ 1% and 2%. The unprimed seeds were taken as control. The data was recorded for seed germination percentage, mean germination time (MGT), germination index (GI), seedling vigor index (SVI), fresh biomass of shoot, fresh biomass of roots, dry biomass of shoot, dry biomass of roots, quality index of the seedlings, sturdiness quotient and leakage of the electrolytes. The results revealed that all the observed parameters studied in the present study were significantly (P<0.05) influenced by various seed priming treatments. The results of seed priming depict that seed germination (90.00%), germination index (0.43), germination time (5.22 days) and seedling vigor index (1498.0) were observed better in response to the luke warm water. While the seeds primed with NaCl @ 1% had better results for fresh biomass of shoot (5.58 g), root (1.44 g), dry biomass of shoot (1.57 g) and root (0.29 g). Quality index of the seedlings and sturdiness quotient had better result from NaCl treatment. The quality of the seedlings was measured in terms of sturdiness quotient, quality index of the seedlings and leakage of the electrolytes. The sturdiness quotient (0.98), quality index of the seedling (24.85) was also better in response to the halo (NaCl) seed priming @ 1%. The only leakage of the electrolytes had no significant of seed priming. It is concluded from the present study that all seed germination related parameters are greatly affected by the lukewarm water treatment. However, parameters related with the seedling growth are affected by the NaCl treatment @ 1%.
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Collet, Catherine, Henri Frochot, Jean-Marc Guehl, and André Ferhi. "Effect of two forest grasses differing in their growth dynamics on the water relations and the growth of Quercus petraea seedlings." Canadian Journal of Botany 74, no. 10 (1996): 1562–71. http://dx.doi.org/10.1139/b96-189.
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Interference between 1-year-old sessile oak (Quercus petraea (Mattus.) Liebl.) seedlings and two grass species (Agrostis stolonifera L. and Deschampsia cespitosa (L.) Beauv.) was evaluated during 3 years after seedling transplantation. The seedlings were grown in large containers under crossed levels of watering regimes (regular irrigation that maintained the soil at field capacity or seasonal water stress) and grass competition (with Agrostis, Deschampsia, or bare soil). After 3 years, seedling basal diameter was 2.5 times greater in the absence of competing vegetation than with one of the two grasses. Within the grass-competition treatments, diameter was 1.3 times as great for the seedlings grown in the irrigated treatments than for the seedlings grown in the water-stressed treatments and was 1.3 times greater for the seedlings grown with Agrostis than for the seedlings grown with Deschampsia. During the first 2 years, the seedlings grew much faster in the bare soil than in the weedy treatments, whatever the watering level. During the 3rd year, the seedlings in all the irrigated treatments showed similar relative growth rate values, which were much higher than those in the water-stressed treatments. Each year, soil water potential reached −2.5 MPa under the two grasses and −0.7 MPa under bare soil by the end of summer. On the contrary, competition for nutrients seemed to be low. Assessments of plant carbon isotope composition showed that the seedlings in the weedy water-stressed treatments had higher intrinsic water-use efficiency, and also suggested that the competition exerted by the two grasses occurred mainly for water. We conclude that during the first 2 years, the negative effects of the two grass species on seedling growth seemed to be largely independent of any competition for water. Conversely, during the 3rd year, the influence of the grasses on the seedlings seemed to be related only to competition for water. Keywords: root interactions, water stress, osmotic adjustment, carbon isotope discrimination, classical growth analysis.
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Machado Neto, Nelson Barbosa, Sérgio Marques Saturnino, Daniel Carlini Bomfim, and Ceci Castilho Custódio. "Water stress induced by mannitol and sodium chloride in soybean cultivars." Brazilian Archives of Biology and Technology 47, no. 4 (2004): 521–29. http://dx.doi.org/10.1590/s1516-89132004000400004.
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Four soybean (Glycine max L. Merril.) cultivars were contrasted in relation to germination and vigour of seedlings, when seeds were submitted to water stress induced by mannitol or sodium chloride. Water stress affected seed germination and seedling development, however, seedling development was affect in higher osmotic potential (-0.3MPa) than the necessary to affect germination -1.2MPa when induced by mannitol or -0.6MPa when induced by sodium chloride. 'Pioneira' and 'Xingu' cultivars had high development in low water availability and/or salinity conditions.
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Addaheri, A. MS, and A. Ch Al-Fahad. "Humic Pre-treated Seeds of Oat Enhances Germination and Seedling Vigor Under Effects of Water Salinity." IOP Conference Series: Earth and Environmental Science 1449, no. 1 (2025): 012086. https://doi.org/10.1088/1755-1315/1449/1/012086.
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Abstract Humic was used as a soaking solution before planting to enhance oat seeds’ tolerance to salinity. To achieve this aim, a factorial experiment of two factors was carried out in the seeds technology laboratory. The first factor was soaking the oat seeds in humic acid for periods of 0, 3, and 6 hours, then the seeds were planted under another factor: the salinity of irrigation water of 0, 3, 6, 9, and 12 dS m−1 (EC). The most important results were summarized as follows: There is an important effect of soaking oat seeds with humic acid on the dry weight of seedlings and the length of the shoot, as soaking for 3 hours recorded the maximum seedlings’ dry weight. Oat seeds soaked in humic acid for 6 hours recorded the greatest shoot length. Increased salinity of irrigation water often led to a reduction in most germination and seedling vigor indicators. The two-way interaction of soak oat seeds with humic acid and salinity of irrigation water had a statistically significant impact on the oat seedling fresh weight, root length, and shoot length. This study concludes that soaking oat seeds with humic acid before planting was beneficial for seedling growth in terms of the dry weight of seedlings and length of seedling shoots, and soaking oat seeds with humic acid for 3 and 6 hours before planting was beneficial for enhancing shoot length when rinsed with water with a salinity of 6 and 9 dS m-1 and soaking in humic acid for 6 hours was beneficial for enhancing shoot length of oat seedling when rinsed with water with a salinity of 0, 6, 9, and 12 dS m−1.
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Benigno, Stephen M., Kingsley W. Dixon, and Jason C. Stevens. "Seedling mortality during biphasic drought in sandy Mediterranean soils." Functional Plant Biology 41, no. 12 (2014): 1239. http://dx.doi.org/10.1071/fp13366.
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Climate change is increasing the frequency and intensity of drought, and seedling response to a recurrent pattern of drought stress is necessary to understand vegetation establishment patterns in particularly for ecological restoration and conservation projects. A controlled environment study investigated seedling physiological response of framework Mediterranean tree species to simulated successive droughts. Six-month-old seedlings were grown in 1.0 m tall pots to emulate deep soil profiles and subjected to a well watered treatment and a drought treatment consisting of an initial 60 day drought (water withholding), followed by 120 days of re-watering and a subsequent 60 day drought. Soil water access, soil water content, maximum root depth and xylem water potential were assessed through successive harvests. To assess seedling response to multiple droughts, gas-exchange and chlorophyll fluorescence measurements were taken every 15 days after each drought, and multiple times throughout re-watering. No seedling mortality was observed during the initial drought, whereas 100% mortality of all species occurred within 48 days of the second drought. Seedling gas exchange and water potential decreased with decreasing water availability but was dependent on the isohydric or anisohydric behaviour of individual species. An absence of sustained photoprotection during the second drought phase heightened photodamage to foliar tissues resulting in a more rapid decrease of gs and leaf water potential. Therefore, biphasic drought proved detrimental to seedling establishment by reducing physiological resilience, highlighting the severity of future climate change predictions towards the regeneration capacity of Mediterranean ecosystems.
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Pramanik, SK, and S. Sikder. "Germination and Seedling Leaf Chlorophyll Content of Wheat (Triticum aestivum L.) Grown under Industrial Wastewater Condition." Agriculturists 18, no. 1 (2020): 10–17. http://dx.doi.org/10.3329/agric.v18i1.49454.
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The tobacco industry is one of the biggest industries in the world generates and disposes large quantities of wastewater in the environment which may be toxic to the plant, animal, public health as well as environment. Therefore, an experiment was conducted during November, 2019 at Crop Physiology and Ecology Laboratory, Hajee Mohammad Danesh Science and Technology University, Dinajpur, Bangladesh to observe the effects of tobacco industry wastewater on germination, early seedling growth and seedling leaf chlorophyll content of wheat (TriticumaestivumL.). Three wheat genotypes (BARI Gom 28, BARI Gom 29 and BAW 1177) and two growing conditions (normal tap water and tobacco industry wastewater) were assigned in a completely randomized design with three replications in germination test. Results showed that germination characteristics, seedling growth and chlorophyll content in leaf of seedling significantly influenced by wheat genotype, growing condition and their interaction. Irrigation with tobacco industry wastewater lowered the germination percentage, rate of germination, co-efficient of germination and vigor index. However, seedlings irrigated with tobacco industry wastewater produced longer shoot and root as compared to seedlings irrigated with tap water. Similarly, tobacco industry wastewater increased the shoot and root dry weight but reduced the chlorophyll content in leaf of seedling. Among the three wheat genotypes, BAW 1177 performed better under both tap water and wastewater conditions regarding germination, early growth and chlorophyll content in leaf of seedling.
 The Agriculturists 2020; 18(1) 10-17
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Groninger, J. W., J. R. Seiler, S. M. Zedaker, and P. C. Berrang. "Photosynthetic response of loblolly pine and sweetgum seedling stands to elevated carbon dioxide, water stress, and nitrogen level." Canadian Journal of Forest Research 26, no. 1 (1996): 95–102. http://dx.doi.org/10.1139/x26-010.
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Seedling stands of loblolly pine (Pinustaeda L.) and sweetgum (Liquidambarstyraciflua L.) were grown in monoculture or mixed stands for two growing cycles in controlled-environment chambers. Treatments consisted of ambient (408 ppm) and elevated (806 ppm) CO2, concentrations, water-stressed and well-watered conditions, and low (20 kg N/ha) and high (215 kg N/ha) nitrogen application rates. Photosynthesis rates were measured under ambient and elevated cuvette CO2 concentrations for both whole stands and individual seedlings from these stands. Significant interactions between CO2 and water suggested that elevated CO2 concentration compensated for low water availability in individually measured loblolly pine and in whole seedling stands regardless of stand type. Expressing photosynthesis on a soil area versus a leaf-mass basis influenced the photosynthetic rankings of the three stand types relative to one another. Net photosynthetic rates per unit leaf mass were 390 and 880% higher in individually measured seedlings than in whole monoculture stands for loblolly pine and sweetgum, respectively. Lower photosynthetic contributions from lower canopy leaves in whole seedling stands compared with the upper canopy leaves used in individual-seedling measurements were thought to be responsible for lower photosynthetic rates in seedling stands. These results suggest that photosynthetic response is influenced by canopy dynamics that are unaccounted for by individual-seedling measurements of photosynthesis. Differences in photosynthetic response between loblolly pine and sweetgum stands and individuals are thought to be largely due to species-specific differences in canopy light extinction characteristics.
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Dai, Qiufang, Ziwei Chen, Zhen Li, et al. "A Monitoring, Evaluation, and Prediction System for Slight Water Stress in Citrus Seedlings Based on an Improved Multilayer Perceptron Model." Agronomy 14, no. 4 (2024): 808. http://dx.doi.org/10.3390/agronomy14040808.
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To address the lack of effective monitoring, evaluation, and prediction methods for water stress in citrus seedlings, we conducted 10 sets of water stress gradient experiments. Based on the experimental dataset, we constructed, trained, and improved an MLP classification model for citrus seedling water stress. In addition, we developed a monitoring, evaluation, and prediction system based on this model. The experiments demonstrated that 7 days of slight water stress can induce changes in overall root wilting and growth stagnation, and the chlorophyll content in the leaves can decrease by up to 11.78%. Furthermore, the optimal VWC for seedlings was [45%, 50%], the boundary of drought was [20%, 25%], and the boundary of waterlogging was [50%, 55%]. We validated the effectiveness of the system in assessing the growth status of seedlings over the past 7 days and predicting it after 7 days through testing sets and experiments on slight water stress. We found that the system achieved non-destructive remote monitoring, evaluation, and prediction of slight water stress in citrus seedlings, thus enhancing seedling quality. These research findings provide valuable insights into water stress management in citrus seedlings and other crops.
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Yang, Rong, Jia Ping Li, and Yan Zhang. "Research for the Effect of Different Concentrations of Biological Activity of Water on the Germination of Maize and the Growth of Maize Seedling." Advanced Materials Research 955-959 (June 2014): 2123–27. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.2123.
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Use different concentrations of biological activity water on corn seeds (Zhen Dan 958) by soaking to deal with, dilution multiple is primary liquid、10 times、50 times、100 times、200 times、400 times and 800 times respectively, as a comparison with distilled water, exploring the influence of biological activity water on corn seeds germination and seedling growth. The result shows: the highest germination rate、germination potential、germination index and germination energy of corn seeds are dealt with by dilute 800 times biological activity water, the aboveground part and root of maze seedlings’ dry weight is largest; dealing with by dilute 800 times biological activity water of maze seedlings’ chlorophyll are at its highest. The experiment tells that biological activity water has effect on corn seeds germination and seedling growth, its effect and dilute strength are related.
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Hernández, José A., Pedro Díaz-Vivancos, José Ramón Acosta-Motos, and Gregorio Barba-Espín. "Potassium Nitrate Treatment Is Associated with Modulation of Seed Water Uptake, Antioxidative Metabolism and Phytohormone Levels of Pea Seedlings." Seeds 1, no. 1 (2021): 5–15. http://dx.doi.org/10.3390/seeds1010002.
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(1) Background: Seed treatment with potassium nitrate (KNO3) has been associated with dormancy breaking, improved germination and enhanced seedling growth and uniformity in a variety of plant species. However, the KNO3 effect seems to be dependent on plant species and treatment conditions. (2) Methods: We describe the effect of incubation of dry pea seeds with different KNO3 concentration on water uptake kinetic, early seedling growth, antioxidant metabolism and hormone profile in pea seedlings. (3) Results: Low (0.25 mM) KNO3 levels increased seedling water uptake and growth, whereas high (40 mM) levels decreased seedling growth. KNO3 treatment differentially affected the antioxidant defences. Low KNO3 levels maintained the activity of antioxidant enzymes, while high levels reduced the activity of H2O2-scavenging enzymes. KNO3 induced a progressive decline in ascorbate levels and reduced (GSH) and oxidised (GSSG) glutathione. Low KNO3 levels strongly increased GA1 and decreased ABA in both seedlings and cotyledons, resulting in a decline in the ABA/GAs ratio. (4) Conclusions: Pea seed treatment with a low KNO3 level promoted early seedling growth. In this process, an interaction among KNO3, antioxidant defences and ABA/GAs ratio is proposed.
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Li, Shu Lin, Zhao Hui Li, Ya Fei Wang, Xiao Ruan, Cun De Pan, and Qiang Wang. "Preliminary Study for the Allelopathic Effect of Water Extracts from Solidago canadensis Leaves." Advanced Materials Research 699 (May 2013): 340–48. http://dx.doi.org/10.4028/www.scientific.net/amr.699.340.
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The allelopathy of the exotic invasive plant, Solidago canadensis L. was studied. S. canadensis leaves were extracted with water and partitioned against ethyl acetate and n-butanol sequentially. The two organic fractions, original water extract and the residual water after the organic solvent extraction were tested for inhibitory activity on seed germination and seedling growth of wheat (Triticum aestivum), setaria (Setaria viridis) and its own species. Germination rate, vigor and index were recorded as germination parameters, and radicle and plumule growth and fresh weight of seedlings were recorded as seedling growth parameters. Results showed that the water extracts of S. Canadensis leaves had significant impacts on the seed germination and seedling growth of the three tested plants. n-Butanol fraction showed the strongest allelopathic effect, while the residual water after the organic solvent extraction had no significant phytotoxic effect compared with the control. n-Butanol fraction at 0.5 mg•ml-1 could significantly inhibited the seed germination of the same species, and that at 5 mg•ml-1 could significantly inhibited the seedling growth of the same species. n-Butanol fraction at 1.5 mg•ml-1 could significantly inhibited the seed germination and seedling growth of wheat. n-Butanol fraction at 5 mg•ml-1 could significantly inhibited the seed germination and seedling growth of setaria. The allelochemicals were mainly contained in n-butanol fraction of water extracts from S. canadensis leaves.
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Silva, Richardson Barbosa Gomes da, Mônica Moreno Gabira, Débora Zanoni do Prado, Gláucia Uesugi, Danilo Simões, and Magali Ribeiro da Silva. "Influence of Mean Leaf Angles and Irrigation Volumes on Water Capture, Leaching, and Growth of Tropical Tree Seedlings." Forests 11, no. 11 (2020): 1198. http://dx.doi.org/10.3390/f11111198.
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Research Highlights: The mean leaf angle and crown projection area can be used as criteria for grouping tree seedling species in different irrigation zones in tree nurseries with overhead microsprinkler systems, preventing water and fertilizer waste, and increasing growth. Background and Objectives: There are important gaps in current functional knowledge about how plant architecture, especially the mean leaf angles of tree seedlings, affect water and nutrient solution capture in overhead microsprinkler systems. These gaps contribute to water and fertilizer waste in tree nurseries. This research aimed to ascertain how mean leaf angles affect irrigation water capture, leaching, and the growth of tree seedlings given different volumes of irrigation. Materials and Methods: Nine species of tree seedlings with different mean leaf angles were submitted to four irrigation volumes (8, 10, 12, and 14 mm) applied daily by overhead microsprinklers in a split-plot design completely randomized. The variables leaching fraction, height, stem diameter, shoot, root, and total dry mass, Dickson quality index, crown projection area, root system quality, and leachate electrical conductivity were evaluated. Results: For species with mean leaf angles of −54, 31, 38, 42, 55, 57, and 58°, the 8 mm irrigation volume was sufficient to produce greater growth and less leaching. For species with angles of −56 and −14°, the 14 mm irrigation volume was required to produce greater growth. Conclusions: The tree seedling species with positive mean leaf angles facilitate irrigation water and nutrient solution capture, allowing the application of lower irrigation volume. On the other hand, some tree seedling species with negative mean leaf angles hinder irrigation water and nutrient solution capture, requiring the application of higher irrigation volume. When the tree seedling species have a negative mean leaf angle, but the crown projection area is small, the difficulty of water and nutrient solution reaches directly the substrate is attenuated.
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Wang, Shi-fa, Huan-yong Li, Chun-ya Feng, et al. "Design and Applied Research of Indoor Soilless Planting Device for Sprout-Seedling Vegetables in Family Rooms." Applied Engineering in Agriculture 36, no. 4 (2020): 605–10. http://dx.doi.org/10.13031/aea.13809.
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Highlights The planting device designed in the study was very suitable for planting sprout-seedling vegetable in family room. The humidity in the planting device was maintained higher than 80%, which far exceeded the humidity in the room. Increasing both the humidity and water supplementation for sprouts was an innovation of this design. The sprout yield reached 50-70 kg m -2 yr -1 , the economic value reached 700-1000 RMB yuan ($99.5-$142.2) m -2 yr -1 . Abstract . In this study, we designed an indoor soilless planting device for planting sprout-seedling vegetables in family rooms and used it to conduct experiments. The results showed that the indoor soilless planting device designed by us had the advantages of a high moisturizing effect (above 80%), convenient disassembly, attractive appearance, low cost and high practicability, and it was very suitable for planting sprout-seedling vegetables such as radish seedlings, water spinach seedlings, pea seedlings, pine willow seedlings, sunflower seedlings, etc. The planting device could meet the needs of people to plant sprouts in family rooms in their spare time, which could not only provide families with high-quality fresh vegetables but could also beautify indoor environments with high economic and ecological benefits. The results show that the average yield of sprout-seedling vegetables reached 50 kg m-2 yr-1 to 70 kg m-2 yr-1, and the average economic value reached 700 RMB yuan ($99.5) m-2 yr-1 to 1000 RMB yuan ($142.2) m-2 yr-1. Keywords: Design, Family rooms, Indoor, Planting device, Soiless, Sprout-seedling vegetables.
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Ye, Long Hua, Qiu Jing Li, Li Xue, Gan Wen Lie, Xiao Li Hou, and Hong Yue Chen. "Effects of Ozone and Drought on Physiological Characteristics of Three Seedling Types in South China." Applied Mechanics and Materials 522-524 (February 2014): 1089–97. http://dx.doi.org/10.4028/www.scientific.net/amm.522-524.1089.
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Seedlings of Michelia macclurei, Cinnamomum camphora and Rhodoleiachampionii were placed in open-top chambers (OTC) with two ozonic treatments including E40 (nature air, 40 ppb) and E150 (150 ppb) and two water treatments. Physiological indexes such as chlorophyll, soluble sugar, soluble protein, proline, MDA and SOD of three seedling types were evaluated. With increasing experimental time, chlorophyll content generally decreased or remained steady, soluble sugar content increased followed by a decrease and SOD activity increased for the three seedling types in ozone treatment, drought treatment or ozone-drought intercross treatment. Contents of soluble protein and proline increased for the three seedling types in ozone treatment and drought treatment. The MDA content increased for M. macclurei and C. camphora in ozone treatment and drought treatment and for R. championii in the three stress treatments. Principal component analysis indicated that the resistance abilities of ozone, drought or intercross stress for the three seedling types was C. camphora seedlings > M. macclurei seedlings > R. championii seedlings.
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Bulmer, C. E., and D. G. Simpson. "Soil compaction and water content as factors affecting the growth of lodgepole pine seedlings on sandy clay loam soil." Canadian Journal of Soil Science 85, no. 5 (2005): 667–79. http://dx.doi.org/10.4141/s04-055.
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The response of lodgepole pine (Pinus contorta Dougl. var. latifolia Engelman.) seedlings to three levels of soil compaction and water content was evaluated in raised beds filled with a sandy clay loam soil. In compacted soils, seedling survival, height, root collar diameter and root growth were reduced. Soil water regime was adjusted with irrigation to levels associated with plant moisture stress (near wilting point) and limiting soil aeration (near 0.10 m3 m-3 air-filled porosity). Soil water regime affected seedling performance, with higher survival, root collar diameter and root growth observed on treatments with higher water content. Compaction had detrimental effects on growth at all levels of soil water availability. Compaction and water content had strong effects on soil mechanical resistance. Limitations to seedling growth and survival were at least partly explained through their relationships with soil water content and soil mechanical resistance, and combinations of these factors as described by the least limiting water range concept. Key words: Soil compaction; soil physical properties; water availability; plant growth response; least limiting water range
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NICOLAU, JOSEFA PATRÍCIA BALDUINO, FRANCISCO EUDES DA SILVA, FRANCIVAL CARDOSO FELIX, SALVADOR BARROS TORRES, MAURO VASCONCELOS PACHECO, and MÁRCIO DIAS PEREIRA. "DISCONTINUOUS HYDRATION ON THE GERMINATION OF Mimosa caesalpiniifolia AND Pityrocarpa moniliformis SEEDS UNDER WATER STRESS." Revista Caatinga 33, no. 2 (2020): 555–61. http://dx.doi.org/10.1590/1983-21252020v33n228rc.
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ABSTRACT The use of discontinuous hydration cycles can act in improving seed germination and seedling initial growth under water stress. In this context, the objective of this study was to evaluate the effect of discontinuous hydration on the germination of Mimosa caesalpiniifolia and Pityrocarpa moniliformis seeds under water stress. For this, seeds of these species were subjected to 0 (without hydration), 2 and 4 hydration cycles (18 h) and dehydration (12 and 18 h, respectively), with subsequent germination under water stress simulated for osmotic potentials of 0.0 (distilled water), -0.2, -0.4, -0.6 and -0.8 MPa. Seedlings were evaluated using tests of germination, germination speed index, mean germination time and seedling length. Discontinuous hydration in M. caesalpiniifolia and P. moniliformis seeds hampers germination and vigor of seedlings under water stress up to -0.6 MPa. However, the use of two cycles in P. moniliformis favors germination under more severe water stress (-0.8 MPa).