Relevant bibliographies by topics / Seedling emergency

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Seedling emergency'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Seedling emergency"

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Boligon, Alexandra Augusti, Alessandro Dal'Col Lúcio, Sidinei José Lopes, Alberto Cargnelutti Filho, and Danton Camacho Garcia. "Wheat seedling emergence estimated from seed analysis." Scientia Agricola 68, no. 3 (2011): 336–41. http://dx.doi.org/10.1590/s0103-90162011000300010.

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There are various vigor tests for the evaluation of seeds physiological quality, however, few studies correlate this tests with plants emergency. This study aimed at identifying wheat (Triticum aestivum L.) seed analysis variables that best predict seedling emergence. Wheat seeds (CEP 30 cultivar) were divided into two batches, one initially subjected to the accelerated ageing process and forming the low-quality batch, and the other, without application of the accelerated ageing process, to compose a high-quality batch. The following seed test variables were evaluated: (i) percentage of normal seedlings in the germination tests, (ii) initial germination counting, (iii) accelerated ageing, (iv) cold test without soil, (v) germination speed index, and (vi) emergence of seedlings in sand after seven and 15 days. The following seedling characteristics were evaluated: root and shoot lengths, total length, and dry mass of the root and shoot. The characteristics evaluated for the seedlings were subjected to path analysis and the seed tests variables to stepwise multiple regression analysis, taking seedling emergence at seven days as the response variable. Factor analysis was also carried out on all variables. Dry mass of the shoot and root length presented the best correlation with seedling emergence for the high-quality batch, but this behavior was not observed for any variable in the low-quality batch. Accelerated ageing was the best seedling emergence estimator for both batches of the used cultivar.
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El-Keblawy, Ali, K. H. Shaltout, J. Lovett-Doust, and A. Ramadan. "Population dynamics of an Egyptian desert shrub, Thymelaea hirsuta." Canadian Journal of Botany 75, no. 12 (1997): 2027–37. http://dx.doi.org/10.1139/b97-914.

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Natural populations of the evergreen shrub, Thymelaea hirsuta (L.) Endl., were studied over 6 years at five desert habitats, in terms of seedling recruitment and adult survival and as a function of plant size and gender class. Habitat and time significantly influenced mortality of both reproductive and non-reproductive plants. Plant size also significantly affected adult mortality. Seedling recruitment varied significantly with habitat and year and approached zero some years. Significant among-year and among-population variation in population growth rates were observed over the 6 years of study, and all populations declined in size (ranging from −1.7% per year at the coastal dune site to −10.9% per year at the inland plateau site). Spearman rank correlation analysis between habitats ranked according to a north–south gradient and demographic variables indicates that this gradient is associated with a pattern of lower seedling emergence and survival and a lower population growth rate and greater mortality for all size-classes of Thymelaea plants. In experimental botanic garden plots, germination of seed collected from five natural populations, and seedling survival in the following year were assessed under conditions of high, medium, and low seedling density. Seedling emergency differed significantly according to maternal habitat. With regular watering, seeding survival to one year was 72% (averaged across habitats and densities). This compares with 64% for seedlings grown at the highest density, suggesting that the intense mortality observed under field conditions is more likely to be a result of water shortage than intraspecific competition. Key words: Egyptian desert, Thymelaea hirsuta, germination and establishment, seedlings, recruitment, competition, population growth rate.
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de Lucena Marinho, Jéssica, José Henrique Bizzarri Bazzo, Carolina Pereira Cardoso, Claudemir Zucareli, and Inês Cristina de Batista Fonseca. "PRODUTIVIDADE E QUALIDADE FISIOLÓGICA DE SEMENTES DE CULTIVARES DE TRIGO EM DIFERENTES DENSIDADES DE SEMEADURA." COLLOQUIUM AGRARIAE 14, no. 3 (2018): 122–31. http://dx.doi.org/10.5747/ca.2018.v14.n3.a234.

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Determination of optimum wheat sowing density, adequate to the genotype and the environment, is essential to avoid lodging and competition between plants, which can reduce seed productivity and quality. In this sense, the objective of this study was to evaluate the effect of seeding density (in cultivars BRS Sabiá e BRS Gralha-Azul) on productivity and physiological quality of seeds of two wheat cultivars. The seeds were produced in the experimental field of the Brazilian Agricultural Research Corporation, in Londrina-PR, at the National Center for Soy Research (Embrapa Soja) in experimental design of randomized blocks in a 2x4 factorial scheme, with four replications. The following evaluations were performed: seed productivity, thousand seeds mass, first count of germination, germination, seedling length, seedling dry weight, accelerated aging, seedling emergence in sand and emergency speed index. In general, the increase in seed density increases seed production and does not alter germination and emergence of seedlings of both cultivars. The cultivar BRS Gralha-Azul proved to be more productive than BRS Sabiá. The increase in seeding density increases seed vigor for BRS Sabiá cultivar and reduces to BRS Gralha-Azul cultivar.
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Suñé, A. S., D. B. Rodrigues, A. S. Almeida, et al. "New Vigor Methodology in Pearl Millet Seeds." Journal of Agricultural Science 11, no. 4 (2019): 205. http://dx.doi.org/10.5539/jas.v11n4p205.

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The use of high quality seeds is of utmost importance and is intimately related to seed vigor. The objective of this study was to stablish a novel methodology for evaluating the vigor of pearl millet seeds. The experiment was performed at the Federal University of Pelotas, using 5 seed lots of pearl millet cv. BRS1501. The research was carried out in two stages: first, seed lots were characterized (physiological quality tests); second, the initial emergence and development of pearl millet seedlings was evaluated, testing four different substrates and five sowing depths in the emergence test. The experimental set up consisted of a completely randomized design with four replicates. Means were compared by the Scott-Knott test at the 5% probability level. The substrates sand and carbonized rice husk, at 1.0 cm depth, satisfactorily stratified seed lots. These methodologies correlated with the speed of emergency index and seedling emergency. Thus, the study identified an innovative method for testing vigor in pearl millet seeds.
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Menegatti, Renata Diane, Luana Oliveira de Oliveira, Ádrya Vanessa Lira da Costa, Eugenia Jacira Bolacel Braga, and Valmor João Bianchi. "MAGNETIC FIELD AND GIBBERELIC ACID AS PRE-GERMINATION TREATMENTS OF PASSION FRUIT SEEDS." Revista Ciência Agrícola 17, no. 1 (2019): 15. http://dx.doi.org/10.28998/rca.v17i1.6522.

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<p>The aim of this study was to evaluate the effect of pre-germination treatments (magneto-priming and immersion of seeds in gibberellic acid solution) on variables associated with germination, emergence and vigor of Passiflora edulis seeds ‘BRS Gigante Amarelo’ cultivar. Seeds were extracted from fruits, washed, immersed for 6 hours in solutions with different GA3 concentrations and later arranged in a circular form in Petri dishes at temperature of 25°C, with and without exposure to magnetic field. Subsequently, analyses associated with the germination and emergency test were carried out. The experimental design was completely randomized design, with 3x2 factorial, three GA3 concentrations (0, 50 and 100 mg L-1) and presence/absence of magnetic field (MF), with four replicates of 20 seeds each. Variables germination percentage, germination speed index, mean germination time, percentage of emerged seedlings, emergence speed index, shoot length and root length and seedling dry weight were evaluated. Results indicate that the exposure of passion fruit seeds to MF in an isolated way stimulates seed germination, emergence and vigor, being an alternative to conventional treatments based on chemical substances.</p>
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Brzezinski, Cristian Rafael, Julia Abati, Fernando Augusto Henning, et al. "Spray volumes in the industrial treatment on the physiological quality of soybean seeds with different levels of vigor." Journal of Seed Science 39, no. 2 (2017): 174–81. http://dx.doi.org/10.1590/2317-1545v39n2175179.

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Abstract: The aim of this work was to evaluate the effect of different spray volumes, via industrial treatment, on the physiological quality of soybean seeds with different levels of vigor. The experimental design was completely randomized in a 2x5 factor scheme, with four replications. Factors consisted in two levels of seed vigor (high and low) and five spray volumes (0, 600, 1200, 1800 and 2400 mL. 100 kg-1). Products used to obtain the volumes were: fungicide (carbendazin + thiram); insecticide (imidacloprid + thiodicarb); nematicide (abamectin); micronutrients (cobalt, molybdenum and zinc); polymer (peridiam); biostimulants (kinetin + gibberellic acid) and inoculum (Bradyrhizobium japonicum). The used cultivars were BRS 360 RR and BRS 1010 IPRO. The physiological seed quality was determined by the following evaluations: germination, first count of the germination test, seedling emergence in sand, emergency speed index, total length of shoot and root of the seedlings. In the different spray volumes, high vigor soybean seeds have higher physiological quality than low vigor seeds. The increased spray volumes in seed treatments reduce the physiological quality of low vigor soybean seeds.
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HELALIA, AWAD M., and J. LETEY. "EFFECTS OF DIFFERENT POLYMERS ON SEEDLING EMERGENCY, AGGREGATE STABILITY, AND CRUST HARDNESS." Soil Science 148, no. 3 (1989): 199–203. http://dx.doi.org/10.1097/00010694-198909000-00007.

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Felippi, Marciele, Solon Jonas Longhi, and Maristela Machado Araújo. "Holocalyx balansae: ASPECTOS FENOLÓGICOS, MORFOLÓGICOS E GERMINAÇÃO DE SEMENTES." FLORESTA 44, no. 4 (2014): 677. http://dx.doi.org/10.5380/rf.v44i4.30999.

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O reduzido conhecimento sobre aspectos básicos relacionados à autoecologia de espécies florestais nativas inviabiliza a elaboração de estratégias para o manejo adequado de florestas, restauração e produção de mudas. Assim, o estudo teve como objetivo caracterizar a época de floração e frutificação, morfologia da flor, fruto, semente, plântula e muda de Holocalyx balansae Micheli (alecrim), além de analisar características físicas e fisiológicas de um lote de sementes. As observações fenológicas foram realizadas mensalmente. O lote de sementes foi formado a partir de seis indivíduos que apresentaram frutos maduros no mesmo período. A presença de flores ocorreu em dois períodos (fevereiro e junho a setembro), da mesma forma que os frutos maduros (novembro e de março a abril). Observaram-se variações fenológicas, conforme o ano e entre árvores no mesmo período, sugerindo a marcação de maior número de exemplares arbóreos marcados do que se deseja coletar. A germinação é hipógea. O tamanho dos frutos e sementes foi variável, resultando em 793 sementes por quilograma, com 83% de germinação, entretanto, sob condições ambientais, ao observar a emergência das plântulas, esse valor decresceu expressivamente (51%), devendo este ser um fator considerado no planejamento de produção de mudas.Palavras-chave: Papilionoideae; floração; frutificação; emergência; muda. AbstractHolocalyx balansae: phenological and morphological aspects, and seed germination. The lack of knowledge about basic aspects related to autoecology of native forest species prevents the development of strategies for appropriate forest management, restoration and production of seedlings. This research aimed to characterize the time of flowering and fruitification, the morphology of flowers, fruits, seeds, seedling and changes of Holocalyx balansae Micheli (rosemary), and analyzing physical and physiological characteristics of a seed lot. We conducted monthly phenological observations. The seed lot had six individuals that exhibited ripe fruits in the same period. The presence of flowers occurred in two periods (February and June to September), just as the ripe fruit (November and March to April). We observed phenological changes during the year between trees in the same period, suggesting that it is necessary to mark a largest number of arboreal specimens than the ones you want to collect. Germination is hypogeal. The size of the fruits and seeds was variable, resulting in 793 seeds per kilogram, with 83% of germination, however, under environment conditions, observing seedling emergence, this value decreased significantly (51%), it should be a factor to be considered in seedling production planning.Keywords: Papilionoideae; flowering; fruiting; emergency; seedling.
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Cruz, Nayara F. F. da S., Luiz A. Zanão Júnior, Reginaldo F. Santos, et al. "Variation of Water Availability in Initial Development of Safflower." Journal of Agricultural Science 11, no. 3 (2019): 558. http://dx.doi.org/10.5539/jas.v11n3p558.

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The availability of water is one of the most important factors for the development of the seeds. Thus, studies related to adequate humidity for germination, emergence and early development of safflowers, is necessary for the productive use of this culture. Thus, the objective of study was to evaluate the initial development of two varieties of seeds of Safflowers (IAPAR and IMA2103) in six levels of water availability in substrate: 0, 10, 20, 30, 40 and 50%. At 15 days the seedling emergence were evaluate. At 30 days were evaluate plant height, root length, stem diameter, number of leaves, fresh weight of the aerial part and root, dry weight of shoot and root. The treatment without irrigation, there was decrease the emergence, emergence speed for both genotypes. Treatments above 30% of water availability in the two varieties presented emergency superior to 50%. Lower irrigation rates favored root length and dry mass.
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Guo, Yubing, Xiaogang Zhang, and Chong Zhang. "ADAPTABILITY TEST OF DRY FARMING TILLAGE TECHNIQUE IN NORTHERN CHINA AND STUDY OF KEY TECHNIQUES." INMATEH Vol.61 61, no. 2 (2020): 273–80. http://dx.doi.org/10.35633/inmateh-61-30.

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Based on the problem of insufficient coordination of integrated machinery and technique configuration in the exploration of dry farming regions, a method of two-period comparative test was carried out in Shanxi Province, China. Zones of the effects of different treatments on straw coverage, soil moisture, emergence rate, seedling condition, yield, and benefit were monitored and analysed. The result was that the coverage before sowing decreased to below 55% after surface harrowing or rotary tillage in autumn by using dry farming technology in Northern China. The average number of emerging seedlings through surface tillage was larger than that without surface tillage by 1.7 plants/5 m; emergency rate was increased by 8.37%, and the increase in amplitude of grain yield reached 28% compared with that of traditional farming. Moreover, the input–output ratio reached 1:4.41. The experiments showed that the net income could reach RMB 1,251–1,401/hm2, and compared with traditional farming, operating cost was lowered by 23.1%–28.8%, and benefit was elevated by 48.8% with prominent cost saving and benefit increase. The study results will facilitate the improvement of water-saving and production-increasing technologies in Northern China and play a critical role in the development of agricultural cultivation and steady growth of agricultural output in this region.
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Dissertations / Theses on the topic "Seedling emergency"

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Sill, David W., Barry Tickes, and Lisa A. Carey. "Field Emergence and Seedling Growth of Lettuce as Affected by Pre-Plant/Pre-Emergent Herbicides." College of Agriculture, University of Arizona (Tucson, AZ), 1997. http://hdl.handle.net/10150/221599.

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Pre plant and pre- emergence herbicides are commonly used in lettuce production. We investigated possible effects the herbicides benefin (Balan), pronamide (Kerb) and bensulfide (Prefar) had on emergence and seedling growth of several iceberg lettuce varieties that had been primed and pelleted by seed enhancement companies The herbicide Prefar and a mixture of Balan + Prefar had the greatest impact on dry weight regardless of variety, while seedlings grown on Kerby plots were not significantly different than seedlings from untreated plots. Dry weight accumulation and field emergence were influenced significantly by pellet types and priming methods.
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Roman, Erivelton Scherer. "Modelling seedling emergence of common lambsquarters in corn." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq31897.pdf.

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Sinclair, John. "Crusting, soil strength and seedling emergence in Botswana." Thesis, University of Aberdeen, 1985. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU363198.

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This thesis gives the results of an investigation of the strengths and particularly the crust forming potential of arable soils from Botswana and the relationship to seedling emergence of sorghum, the most important crop in Botswana and one that because of its small seed weight (about 2 0 mg) can fail to emerge through a hard soil crust. A review of the literature suggested that the soil factors which had to be considered were dispersibility of clay and factors which affect this, and the bulk density of the soils. Soils which are found in many tropical and sub-tropical regions, with low organic matter and inactive clays can set hard after a simple wetting and drying cycle. In these soils, the strength is very strongly dependent on the water content, showing a hyperbolic or exponential relationship-, and the strengths when dry may be very greatly increased by remoulding the wet soil. The crust strength required to prevent seedling emergence varies with the size of the seedling and for cotton (seed weight about 80 mg), 1-3 MPa penetration resistance measured with a penetrometer is sufficient to prevent emergence. Seedlings exert a total force proportional to their number. In the experimental programme, seedlings' forces were measured, seedling emergence observed in a field experiment under crusting conditions, and the strength characteristics of a group of soils, representative of arable soils in Botswana, studied. A sorghum seedling was found to exert a maximum force of about 1 N or dividing by the area of the plumule, a pressure of about 0,5 MPa. The field experiment showed that much better emergence was obtained from planting 15 seeds together than from planting 4 seeds together when a crust formed after planting. A study of 32 soils, most of them sand to sandy loam in texture but with a few clays and hydroirorphic soils, from arable areas in Botswana showed the sandy to sandy loam soils to have high bulk densities ( 1,45-1 ,75 Mg/m3) and extremely low organic carbon contents (0,12-0,85 g/100g). The bulk densities of all the soils were inversely related to the organic carbon content and this was itself related to the clay content of the soils. The bulk densities of the sands were dependent on the grading of the sand fraction. Many of the soils were sensitive to remoulding in the Emerson test and the sands to loany sands had 0,4-1,0 g/100 g water dispersible clay. Measurements of tensile strength on air-dry samples showed that all the soils, except for one sand, set hard after a wetting and drying cycle, giving for vacuum wet samples indirect tensile strengths 1,0-14,4 kPa. For the sands to sandy loams this strength was related to the water dispersible clay content. Samples wet at atmospheric pressure were weaker than the vacuum wet samples, the reduction in strength was related to the air porosity of the non-vacuum wet soils prior to drying. Remoulding the soils prior to drying them increased the strength by a factor of up to 50 times, giving strengths from 4 kPa to 600 kPa. The strength after remoulding was dependent on the Emerson index. Compacting the soils increased their strength greatly and to an extent that agreed with the hypothesis that the strength obtained was proportional to the area of contact between the particles. Experiments on penetration resistance at a range of water contents were performed on a few soils. A hyperbolic relationship between water content and penetration resistance of the surface soil was found for sand to sandy loam soils, with the maximum resistance of dry soils above 2 MPa. The penetration resistance of the sandy loam soil was Increased three times by disturbing it when wet. Sprinkler wetting the sieved soils was not found to affect the penetration resistance by a large amount compared and other methods of welting. Penetration resistance was measured on air-dry samples of most of the main group of soils following varying degrees of wetting with a rainfall simulator. The clays and hydromorphic soils gave very low values of penetration resistance under these conditions, showing that at organic carbon contents of about 1% and clay contents from 20 to 30%, the decreased bulk density and tendency to form aggregates' on drying overcame the tendency to set hard. The mean values for the sands to sandy loams were from 1 to 6 MPa so all these soils could offer significant resistance to a sorghum seedling. The penetration resistance of the sands and loam/ sands depended on their bulk densities and water dispersible clay contents, while the penetration resistance of the sandy loams depended only on the water dispersible clay content.
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Alves, Fernanda Vieira. "Composição química e qualidade fisiológica de sementes de girassol de plantas submetidas à competição intraespecífica." Universidade Federal de Uberlândia, 2010. https://repositorio.ufu.br/handle/123456789/12139.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The great number of seeds in the sunflower head and the temporal distribution of its maturation cause the competition between whorls because of nutritional resources and, consequently, differences in the seed chemical composition from the head regions. As the competition among plants in the sowing line can influence seeds nutrient drainage, this work aimed at evaluating both the chemical composition and the physiologic quality of sunflower plants seed coming from different regions of the sunflower head and plants stemming from high, low vigor seeds that partook of intra-specific competition. Three experiments constituted dealing with seeds coming from one third of the head (peripheral, median and central) were carried out. The experimental design was in randomized blocks with four repetitions, each experiment treatment being distributed on a subdivided plot. In the plots, it was evaluated five proportions of high-vigor seeds placed in the sowing line as it follows: 0,75 (3A:1B); 0,67 (2A:1B); 0,50 (1A:1B); 0,33 (1A:2B), and 0,25 (1A:3B). In the subplot, it was evaluated plants stemming from seeds of high and low vigor and two additional treatments (all plants coming from seeds of high or low vigor, 1A:1A and 1B:1B, respectively). After that, an analysis relating vigor proportions to the head thirds was made. It was evaluated the percentage of proteins, lipids, total carbohydrates, ashes, moisture degree, the weight of a thousand seeds, emergency measures (its initial, ending, and middle times, emergence and average velocity, uncertainty, synchronicity, time variation coefficient and emergency) obtained through emergency test in the sand. It concludes that: a) the proportion of vigor of the seeds in the sowing line interfere in performance of the plants and in seed quality resultant, being that the plants coming of seeds put in major proportion in the line, independently of the vigor have major competitiveness; b) the chemical composition of the sunflower seeds ranged with the position of the seeds in the head. Higher content of carbohydrates and weight of thousand seed were observed in the peripheral third, while the higher content of protein and lipids were obtained of the seeds in the middle third; c) the position of the seed in the head interfered in the variables of germination. Although sunflower head s third peripheral seeds showed a higher emergency ignition in the sand, it showed a lower final time and time variation coefficient, besides being having a higher emergency homogeneity and synchrony. The middle third seeds, on the other hand, showed low emergency homogeneity and synchrony, being more distributed in time.<br>O grande número de sementes presentes no capítulo de girassol e a distribuição temporal da maturação delas geram a competição entre os verticilos por recursos nutricionais e, logo, diferenças na composição química entre sementes das regiões da inflorescência. Como a competição de plantas na linha de semeadura pode influenciar na drenagem de nutrientes para as sementes, este trabalho objetivou avaliar a composição química e a qualidade fisiológica de sementes de girassol oriundas de diferentes regiões do capítulo e de plantas-mãe originadas de sementes de alto vigor e de baixo vigor que sofreram competição intraespecífica. Foram conduzidos três experimentos constituídos por sementes oriundas dos terços do capítulo (periférico, mediano e central). O delineamento experimental foi em blocos casualizados com quatro repetições. Os tratamentos em cada experimento foram distribuídos em parcelas subdivididas, na quais se avaliaram cinco proporções de sementes com alto vigor colocadas na linha de semeadura: 0,75 (3A:1B); 0,67 (2A:1B); 0,50 (1A:1B); 0,33 (1A:2B) e 0,25 (1A:3B). Nas subparcelas, foram avaliadas as plantas oriundas das sementes de cada nível de vigor (alto e baixo) e dois tratamentos adicionais (todas as plantas oriundas de sementes de vigor alto ou vigor baixo, 1A:1A e 1B:1B, respectivamente). Depois foi feita a análise relacionando-se as proporções de vigor avaliadas e os terços do capítulo. Foram avaliadas a porcentagem de proteínas, lipídeos, carboidratos totais, cinzas, grau de umidade e peso de mil sementes, além das medidas de emergência (tempos inicial, final e médio de emergência, velocidades média e de emergência, incerteza, sincronia, coeficiente de variação do tempo e emergência), obtidas por meio do teste de emergência em areia. Conclui-se que: a) a proporção de vigor das sementes na linha de semeadura interfere no desempenho das plantas e na qualidade das sementes resultantes, e as plantas oriundas de sementes colocadas em maior proporção na linha, independentemente do vigor, têm maior competitividade; b) a composição química das sementes de girassol variou com a posição das sementes no capítulo. Maior teor de carboidratos e peso de mil sementes foram observado no terço periférico, ao passo que maior teor de proteína e lipídeos foi obtido das sementes do terço central; c) a posição da semente no capítulo interferiu nas variáveis da germinação. Embora apresentem maior tempo inicial de emergência em areia, as sementes do terço periférico do capítulo de girassol apresentam menor tempo final e menor coeficiente de variação do tempo, tendo maior homogeneidade e sincronia de emergência. As sementes do terço central, em contrapartida, apresentam menor homogeneidade e sincronia de emergência, sendo mais distribuídas no tempo.<br>Mestre em Agronomia
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Schutte, Brian J. "Biology and ecology of Ambrosia Trifida L. seedling emergence." The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1181937971.

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Fessehazion, Melake Kessete. "Predicting and improving seedling emergence of three vegetable crops." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-02092006-130454.

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Welling, P. (Pirjo). "Regeneration by seeds and vegetation structure in alpine plant communities, subarctic Finland." Doctoral thesis, University of Oulu, 2002. http://urn.fi/urn:isbn:951426861X.

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Abstract The aims were to examine the importance of regeneration by seeds, the influence of plant traits and disturbances, and the role of seed-seedling conflicts in regeneration and in the determination of vegetation structure. The study was carried out at in a subarctic alpine area (Kilpisjärvi 69°01'N 20°50E', Finland). Seed bank and seedling densities were high in many plant communities (ranges 99 -1109 viable seeds/m2 and 0.2-227 seedlings/m2, respectively). Effective seedling recruitment is reflected in vegetation as a high proportion of plants with poor or no vegetative reproduction ability. This development may take place in meadows and snowbeds where herbs (e.g. Gnaphalium supinum, Sibbaldia procumbens, Veronica alpina and Viola biflora) are abundant. On the other hand, the low proportion of these plants in heath vegetation reflects ineffective seedling recruitment. Floristic similarities between the consecutive phases in the regeneration pathway may be low despite effective seedling recruitment. Clonality, large and small seed sizes and appendaged diaspores limit the movement of species from phase to phase. Generally, disturbances facilitate effective regeneration by seeds. Grazing promotes species with large seed banks and is therefore one reason for high seed bank densities. Freezing and melting processes negate a negative influence of altitude on seed bank densities in the phase of seedlings. However, if disturbances are severe and continuous and the soil is compact, unstable or dry, disturbances are not beneficial. The same is true if there is a shift in the species composition of seedlings from gaps to closed vegetation. This phenomenon occurred in a rich meadow. Seed-seedling conflicts limit regeneration by seeds in low-herb snowbeds and Ranunculus glacialis-Gymnomitrion snowbeds. Vegetative reproduction and infrequent pulses of seedling recruitment negate an influence of short-term seedling recruitment on the spatial structure of vegetation. Extreme conditions, such as low temperatures, instability of the soil and late snowmelt modify the influence of factors that are important in more moderate conditions. To conclude, all transitions limit regeneration by seeds. However, favourable conditions (e.g. moist conditions in a meadow) partly eliminate the obstacles against seedling emergence. Regeneration by seeds therefore has a major impact on the dynamics and structure of vegetation. In heath vegetation, where bare soils are dry and the moss cover is thick, large seed banks and seed rains do not guarantee effective seedling recruitment. The regeneration process is reduced in the early phases, and plants that reproduce primarily by seeds have a minor role in vegetation. The accumulation of seed banks is effective in these circumstances.
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Kittock, David L., Wallace C. Hofmann, B. Brooks Taylor, Joel Malcuit, Carl Michaud, and Peter T. Else. "Seedling Emergence Studies on Upland Cotton in Arizona in 1984." College of Agriculture, University of Arizona (Tucson, AZ), 1985. http://hdl.handle.net/10150/203916.

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Kittock, D. L., W. C. Hofmann, J. Malcuit, P. Else, and C. Michaud. "Seedling Emergence Studies on Upland Cotton in Arizona in 1985." College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/219703.

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The 1985 and 1986 Cotton Reports have the same publication and P-Series numbers.<br>Seed of 19 upland cotton varieties was planted early in the season at 3 locations to evaluate relative emergence. Variety comparisons for seedling emergence were consistent at the 3 locations. Comparison of performance of older varieties with past years showed consistent relative emergence in 7 comparisons and an apparent weak seed lot for one variety in 1985 and apparent weak seed lots for another variety in past years. Deltapine 41 has consistently been near the bottom in early season seedling emergence over years and Deltapine 61 has been below average.
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Trimble, Loren Ambrose. "Genetic improvement of seedling emergence of low-phytate soybean lines." [Ames, Iowa : Iowa State University], 2009.

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Books on the topic "Seedling emergency"

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Institute, Petawawa National Forestry. Modelling seedling emergence using soil monoliths. Petawawa National Forestry Institute, 1995.

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McWilliam, S. C. Establishment of oilseed rape: The influence of physical characteristics of seedbeds and weather on germination, emergence and seedling survival. HGCA, 1998.

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Test No. 208: Terrestrial Plant Test: Seedling Emergence and Seedling Growth Test. OECD, 2006. http://dx.doi.org/10.1787/9789264070066-en.

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Riggs, Kate. Ambulances: Seedlings. Creative Company, The, 2016.

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Thomasson, James E. Effects of tillage-induced soil compaction on carrot seedlings emergence and yield. 1988.

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Thomasson, James E. Effects of tillage-induced soil compaction on carrot seedlings emergence and yield. 1988.

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Competitive effects of bluebunch wheatgrass, crested wheatgrass, and cheatgrass on antelope bitterbrush seedling emergence and survival. U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Research Station, 1999.

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Venegas, Cesar Rolando. The effect of direct application of liquid fertilizers on the germiniation, emergence and seedling growth of wheat (Triticum aestivum L.). 1988.

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Book chapters on the topic "Seedling emergency"

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Wright, L. Neal. "Drought Influence on Germination and Seedling Emergence." In Drought Injury and Resistance in Crops. Crop Science Society of America, 2015. http://dx.doi.org/10.2135/cssaspecpub2.c2.

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Wang, H., H. Cutforth, T. McCaig, et al. "Modeling Time of Seedling Emergence of Spring Wheat." In Crop Modeling and Decision Support. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01132-0_1.

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Stoffella, Peter J., and Donald A. Graetz. "Sugarcane Filtercake Compost Influence on Tomato Emergence, Seedling Growth, and Yields." In The Science of Composting. Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1569-5_175.

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Meiman, Paul J., Edward F. Redente, and Mark W. Paschke. "Diffuse knapweed (Centaurea diffusa Lam.) seedling emergence and establishment in a Colorado grassland." In Herbaceous Plant Ecology. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2798-6_22.

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Pandit, Bishnu Hari, Netra Kumari Aryal, and Hans-Peter Schmidt. "Social-Ecological Transformation Through Planting Mixed Tree Species on Abandoned Agricultural Land in the Hills of Nepal." In Fostering Transformative Change for Sustainability in the Context of Socio-Ecological Production Landscapes and Seascapes (SEPLS). Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6761-6_5.

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AbstractA project entitled, “Building village economies through climate farming &amp; forest gardening” (BeChange) was implemented in four municipality areas of the Tanahun and Lamjung districts of Nepal from May 2015. In order to assess changes in the social-ecological system that result from this project targeting abandoned agricultural lands, this case study was conducted using various methods: triad grouping, GPS point surveys, household surveys, focus group discussions (FGDs), field observation and reports. A participatory approach in reforestation on abandoned agricultural land with introduction of carbon credits has become a new livelihood strategy for local communities. It has not only attracted domestic and international tourists, but also helped to conserve biodiversity and local ecology. This activity also united village women and indigenous communities as triad groups for collaborative outcomes. A total of 42,138 seedlings of mixed tree species such as Michelia champaca, Elaeocarpus ganitrus, Bassia butyraceae, Bauhinia purpurea, and Cinnamon tamala were planted by 276 families on abandoned agricultural land between May 2015 and July 2018. However, as of 2020, this range has expanded to include 635 families with plantations of more than 65,000 seedlings. The set-up and maintenance of these forest gardens were financed with advanced payments for the carbon sink services of the planted trees. Farmers who succeeded with tree survival rates above 80% received an additional yearly carbon sink payment. The outcomes of the project show significant improvements in food security and tree biodiversity in the project villages. Of the total sampled households, almost half (45%) were under extreme poverty and had food sufficiency for only 3 months/year before the project. With the project, this percentage dropped to 22%, signals the emergence of seeds for transformative change.
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Herr, D. G., and L. C. Duchesne. "Jack Pine (Pinus banksiana) Seedling Emergence is Affected by Organic Horizon Removal, Ashes, Soil, Water and Shade." In Boreal Forests and Global Change. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-017-0942-2_16.

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Prasad, Tottempudi K., and Cecil R. Stewart. "Molecular Mechanisms of Chilling-Induced Oxidative Stress Injury and Tolerance in Pre-Emergent Maize Seedlings." In Plant Cold Hardiness. Springer US, 1997. http://dx.doi.org/10.1007/978-1-4899-0277-1_20.

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Ahmed, Omar. "Parallel Voices." In Studying Indian Cinema. Liverpool University Press, 2015. http://dx.doi.org/10.3828/liverpool/9781906733681.003.0008.

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This chapter assesses Shyam Benegal's seminal Ankur (The Seedling, 1972). The emergence of state-sponsored film-making in the late 1960s with Mrinal Sen's Bhuvan Shome (1969) laid the foundations for a new cinematic discourse, giving way to the next phase in the development of Indian art cinema, dubbed by many as ‘parallel cinema’. The work of film-maker Shyam Benegal forms a major part of the parallel cinema movement, and the rural trilogy of films characterising his early work not only sympathised with the oppressed underclass but also established an influential political precedent for many of the young film-makers emerging from the prestigious Film and Television Institute of India. The chapter looks at the origins and context of New Indian cinema, as well as the definitions of parallel cinema and its importance to the development of art cinema. It also considers Shyam Benegal's authorial status, key ideological strands, and the film's role in helping to politicise cinema in India.
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Wilson, D. Harlan. "This Way to Inner Space." In J. G. Ballard. University of Illinois Press, 2017. http://dx.doi.org/10.5622/illinois/9780252041433.003.0003.

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This chapter provides a concerted overview of Ballard’s short story production and publication, foregrounding key collections, among them The Voices of Time,The Terminal Beach, Vermillion Sands, Myths of the Near Future andWar Fever. It also accounts for articles, essays, reviews, introductions and other nonfiction texts written throughout his life to subsidize his income from fiction. While Ballard’s novels contain the real meat of his legacy, his stories are crucial building blocks, test sites for his craft and the emergent flows of inner space as well as seedlings for book-length works. Before appearing in the aforementioned iconic collections, they were printed mainly in British SF magazines such as New Worlds, Science Fantasy, Ambit andInterzone.
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Kozyrskyi, Volodymyr, Vitaliy Savchenko, and Oleksandr Sinyavsky. "Presowing Processing of Seeds in Magnetic Field." In Handbook of Research on Renewable Energy and Electric Resources for Sustainable Rural Development. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3867-7.ch024.

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The reclamation of new areas or distant lands, which have limited energy and material resources, requires the use of energy saving technologies, which include presowing processing of seeds in magnetic field. The aim of this chapter is to reveal the effect that magnetic field has on seeds and to detect the most effective condition to process seeds in magnetic field before sowing and constructive parameters of the equipment. Magnetic field accelerates chemical reactions, which occur in plant cells, salts and fertilizers dissolve better, and the permeability of cell membranes increases, which accelerates the diffusion of molecules and ions. Due to this, the concentration of ions and oxygen molecules in a cell increases and seeds absorb water better. Presowing processing of seeds stimulate 25–40% seedling emergence and 30–35% germination. The most effective condition of presowing processing of seeds in magnetic field is 0.065 Тl magnetic induction with four times magnetic reversal and 0.4 m/s seed velocity. As a result, agricultural crop yield increases approximately by 20–25%.
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Conference papers on the topic "Seedling emergency"

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Khalid, Mustafa M., and R. L. Kushwaha. "Seedling Emergence Simulation Using Mechanical Probes." In International Off-Highway & Powerplant Congress & Exposition. SAE International, 1992. http://dx.doi.org/10.4271/921618.

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Carla N. Thomas, William L. Bauerle, Tom O. Owino, and John P. Chastain. "Land Application of Brick Plant Air Scrubber Byproduct: Influence on Corn Seedling Emergence and Plant Development." In 2004, Ottawa, Canada August 1 - 4, 2004. American Society of Agricultural and Biological Engineers, 2004. http://dx.doi.org/10.13031/2013.16416.

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Kan, Haiming, Juying Wu, Tiejun Sun, Guixia Liu, and Zhuo Pang. "The Effects of Gap Disturbance on the Seedling Emergence, Survival and Growth of Two Different Native Species in Inner Mongolia." In 2016 International Forum on Energy, Environment and Sustainable Development. Atlantis Press, 2016. http://dx.doi.org/10.2991/ifeesd-16.2016.174.

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Rostova, E. N. "Brassica nigra in the steppe Crimea." In РАЦИОНАЛЬНОЕ ИСПОЛЬЗОВАНИЕ ПРИРОДНЫХ РЕСУРСОВ В АГРОЦЕНОЗАХ. Federal State Budget Scientific Institution “Research Institute of Agriculture of Crimea”, 2020. http://dx.doi.org/10.33952/2542-0720-15.05.2020.32.

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The expansion of the oilseeds adapted to the soil and climatic conditions of the steppe Crimea will increase the biodiversity on the peninsula and, therefore, maximize the efficient use of its natural potential. Brassica nígra is an insufficiently studied crop under the conditions of the Crimean steppe zone. Therefore, the aim of the research was to study the biological characteristics, seed productivity, and yield quality indicators of some varieties of Brassica nígra in the aforementioned environmental conditions. We studied two varieties of Brassica nígra namely ‘Niagara’ and ‘Smuglyanka’ under rain-fed conditions without any fertilizers. Preceding crop – winter wheat. Cultivation technology – generally accepted. The growing season of ‘Niagara’ variety was 4-7 days shorter than that of ‘Smuglyanka’. This difference was due to the late emergence of seedlings. However, all the following stages of growth and development took place almost simultaneously. In 2017-2019, ‘Niagara’ variety gave the highest yield (0.45 t/ha) exceeding ‘Smuglyanka’ by 0.15 t/ha. The maximum content of fatty oil was in the ‘Niagara’ seeds – 39.3%; ‘Smuglyanka’ contained 24.7%. The main advantage of ‘Niagara’ – high content of essential oil in the seeds (0.96%), which is 3.7 times higher than in the seeds of the ‘Smuglyanka’ variety.
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Reports on the topic "Seedling emergency"

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Hall, Derek B., Val Jo Anderson, and Stephen B. Monsen. Competitive effects of bluebunch wheatgrass, crested wheatgrass, and cheatgrass on antelope bitterbrush seedling emergence and survival. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, 1999. http://dx.doi.org/10.2737/rmrs-rp-16.

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