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1
Macák, M., M. Žitňák, and L. Nozdrovický. "Using satellite navigation for seeding of wide-row and narrow-row crops ." Research in Agricultural Engineering 57, Special Issue (December 6, 2011): S7—S13. http://dx.doi.org/10.17221/6/2011-rae.
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The present paper is aimed at the use of satellite navigation of field machinery during seeding, this operation belonging to the most important field practises. Our attention was focused on the determination of the accuracy of the satellite navigation system based on using the correction signal real-time kinematic and its correct application for planting a wide-row crop (sunflower) and seeding a narrow-row crop (spring barley). The aim of the field experiment was also to specify the level of the necessary accuracy of satellite navigation systems during planting and seeding. The length of seeding/planting equipment was confronted with the accuracy of navigation of individual passes, especially when turning on the headlands. In the conclusion, the importance is highlighted of the automated tractor headland control during satellite navigation of combined field machines in the crop production.
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Jahedi, M. B., F. Vazin, and M. R. Ramezani. "EFFECT OF ROW SPACING ON THE YIELD OF COTTON CULTIVARS." Cercetari agronomice in Moldova 46, no. 4 (December 1, 2013): 31–38. http://dx.doi.org/10.2478/v10298-012-0101-y.
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ABSTRACT Modern cotton (Gossypium hirsutum L.) cultivars with herbicide resistance have rejuvenated an interest in narrow row cotton production, primarily because of the reduction of weed control problems encountered in the past with narrow row systems. While the primary goal of narrow row cotton is to reduce production costs, an agronomic and physiological evaluation of this cropping system is also needed. The objectives of this study were to determine the feasibility of using modern cotton cultivars in narrow rows (30 cm) for cotton production in the Gonabad and to assess the effect of these various systems on cotton growth, lint yield, and fiber quality. Plant height, sympodia and total bolls per plant were reduced in cotton grown in narrow row spacing. In most cases, cotton grown in narrow rows had lint yields equal to or higher than those attained in the 70 cm spacing. modern cultivars in narrow row cotton production did not improve lint yield. No conclusions could be made regarding the impact of plant stature on lint yield. Row spacing had little impact on fiber quality narrow row cotton appeared to be a viable agronomic cotton production practice for the Gonabad compared with conventionally - grown cotton based upon lint yield and fiber quality.
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Balkcom, Kipling S., Francisco J. Arriaga, Kris B. Balkcom, and Deborah L. Boykin. "Single- and Twin-Row Peanut Production within Narrow and Wide Strip Tillage Systems." Agronomy Journal 102, no. 2 (March 2010): 507–12. http://dx.doi.org/10.2134/agronj2009.0334.
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Brodrick, Rose, Michael P. Bange, Stephen P. Milroy, and Graeme L. Hammer. "Yield and Maturity of Ultra-Narrow Row Cotton in High Input Production Systems." Agronomy Journal 102, no. 3 (May 2010): 843–48. http://dx.doi.org/10.2134/agronj2009.0473.
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Krutz, L. J., M. A. Locke, R. W. Steinriede, K. N. Reddy, L. Libous-Bailey, and I. C. Burke. "Water, sediment, and metolachlor transport differences between wide- and narrow-row cotton production systems." Journal of Soil and Water Conservation 67, no. 1 (January 1, 2012): 8–15. http://dx.doi.org/10.2489/jswc.67.1.8.
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Borghi, Émerson, Carlos Alexandre Costa Crusciol, Adriano Stephan Nascente, Gustavo Pavan Mateus, Priscila Oliveira Martins, and Ciniro Costa. "Effects of row spacing and intercrop on maize grain yield and forage production of palisade grass." Crop and Pasture Science 63, no. 12 (2012): 1106. http://dx.doi.org/10.1071/cp12344.
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Intercropping of maize (Zea mays L.) with perennial forage, such as palisade grass [Brachiaria brizantha (Hochst. ex A. Rich) Stapf], provides large amounts of biomass that can be used as straw for no-tillage systems or as pasture for animal grazing. In addition, the use of narrow row spacing may increase maize grain yield. However, it is important to evaluate intercrops at different row spacing to avoid reductions in both maize and forage biomass production. The objectives of this field experiment during two growing seasons in Brazil were as follows: (1) to evaluate the influence of intercropping and row spacing on maize yield, leaf nutrient concentration, and plant population and development; and (2) to assess the influence of row spacing on palisade grass herbage mass and leaf nutrient concentration. The experimental design was a randomised complete block design in a 2 × 2 factorial scheme, with eight replications. The treatments comprised two row spacing distances (0.45 and 0.90 m) and two crop management types (maize monoculture and intercropped with palisade grass). The nutrient concentrations in the leaves of the maize plants were in the ideal range for this crop under all conditions studied. Plant height, height of first ear, and number of grains per ear were higher with the narrow row spacing. Maize grain yield was similar in both crop management types (10 301 and 9745 kg ha–1 for monoculture maize and intercropped, respectively). However, maize grain yield at the narrow row spacing was higher than that obtained with the wide row spacing (9948 v. 8905 kg ha–1). In contrast, row spacing did not affect the nutrient level or quality (crude protein concentration) of palisade grass. The amount of dry matter (DM) from palisade grass was lower at maize harvesting (4.7 Mg ha–1) and 90 days after harvesting (6.9 Mg ha–1) under narrow spacing. However, the amount of DM was similar at both row spacings at 120 days after maize harvesting (9.2 Mg ha–1). When there is no problem with water and nutrient availability, the use of maize and palisade grass intercropping under both row spacing conditions (0.45 and 0.90 m) provides an option for the production of forage DM without reducing the maize grain yield.
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RAHMAN, TANZEELUR, LIN YE, XIN LIU, NASIR IQBAL, JUNBO DU, RENCAI GAO, WEIGUO LIU, FENG YANG, and WENYU YANG. "WATER USE EFFICIENCY AND WATER DISTRIBUTION RESPONSE TO DIFFERENT PLANTING PATTERNS IN MAIZE–SOYBEAN RELAY STRIP INTERCROPPING SYSTEMS." Experimental Agriculture 53, no. 2 (May 2, 2016): 159–77. http://dx.doi.org/10.1017/s0014479716000260.
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SUMMARYUnderstanding crop water use in mixed crops over sole cropping is vital for developing optimum water management systems for crop production. In this study, a two-year field experiment with typical maize (Zea mays L.) and soybean [Glycine max (L.) Merr.] relay strip intercropping (2:2 maize-to-soybean rows; 200 cm bandwidth) was carried out in the 2013 and 2014 growing seasons. The quantitative effects of various planting patterns on the water-use efficiency (WUE) and water distribution were investigated. Our results indicated that soil volumetric water content and soil evaporation in the intercropping systems showed decreasing trends in the order: maize row (MM) < maize-to-soybean row (MS) < soybean row (SS). The highest leaf transpiration (1.91 and 2.07 mmol m−2 s−1) for the intercropped maize was measured in each of the two years in the 20 cm maize narrow-row planting pattern and decreased thereafter. Opposite trend was observed for the intercropped soybean; the highest soybean leaf transpiration (7.01 and 6.80 mmol m−2 s−1 for 2013 and 2014, respectively) was recorded in the 70 cm. The WUE of maize and soybean intercrops was lower than that of sole crop counterparts. However, the maximum group water use efficiency (GWUE) of 26.08 and 26.20 kg ha−1 mm−1 in the 40–50 cm maize narrow-row planting pattern was, respectively, 39.6% and 23% higher compared with that of sole crops. The water equivalent ratio (WER) values ranged from 1.60–1.79, suggesting better crop water use in the intercrops over sole cropping. Planting patterns provided by 40–50 cm maize narrow-row spacing were considered the most efficient in terms of maximum total yields, GWUE and WER. These results suggest that an appropriate reduction in the spacing of narrow maize row with wide soybean row could be an efficient crop management method to achieve optimal WUE and homogeneous water distribution in maize–soybean intercropping systems.
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Acciares, H. A., and M. S. Zuluaga. "Effect of plant row spacing and herbicide use on weed aboveground biomass and corn grain yield." Planta Daninha 24, no. 2 (June 2006): 287–93. http://dx.doi.org/10.1590/s0100-83582006000200011.
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The use of narrow plant spacing in corn (Zea mays) has been suggested as a technological alternative to obtain grain yield increases, due to a better use of resources. The regular pattern could diminish intraspecific competition while favoring interspecific competition with weeds. The objective of this study was to analyze the effect of corn row spacing on weed aboveground biomass and corn grain yield. Field experiments were conducted during 2002/2003 and 2003/2004 growing seasons. Three corn hybrids with two-row width (0.70 and 0.35 m) were tested. A greater photosynthetic photon flux density (PPFD) interception with a lower weed aboveground dry matter in narrow row arrangement was obtained. Corn grain yield was greater in the narrow row arrangement than in the wide row spacing. This increase in grain yield was related to a better resource use that allows for a reduced interspecific competition. The use of reduced spatial arrangement appeared to be an interesting alternative to increase both the grain yield potential and corn suppressive ability against weeds in corn dryland production systems.
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DARAWSHEH, Mohammed K., Ioanna KAKABOUKI, Ioannis ROUSSIS, and Dimitrios J. BILALIS. "Cotton Response to Planting Patterns under Effect of Typical and Limited Irrigation Regime." Notulae Botanicae Horti Agrobotanici Cluj-Napoca 47, no. 4 (November 28, 2019): 1206–14. http://dx.doi.org/10.15835/nbha47411712.
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Decrease of width between cotton (Gossypium hirsutum L.) row spacing has been suggested as an agronomic practice that may increase the yield and reduce the cost production. Altering agronomic practices as row spacing system as well as irrigation regime can affect cotton growth parameters, yield components, and physical fiber properties. The object of this study is the assessment of interaction between row spacing cropping systems and irrigation regime and their effects on yield components. Yield, biomass, harvest index, seed index, seed weight, bolls number, individual boll weight, the proportion of lint and seed were studied in three row spacing systems [conventional row (CR), narrow row (NR) and ultra-narrow row (UNR)] under typical and limited irrigation regime, during two growing seasons. The decrease of row spacing had different effect on yield components under the typical and limited irrigation regime e.g. the differences between systems of row spacing on bolls number were more evident under the limited irrigation than the typical one, and the opposite was true for the lint proportion. Decreased row spacing had positive effects on yield, biomass, bolls number per land area and lint proportion in two irrigation systems. However, had negative impact on individual boll weight, seed weight, seed index, harvest index and seed proportion. Interaction of row spacing and irrigation regime was significant for seed index. High differences were more significant between UNR and CR and less between NR and CR. UNR system appeared to be viable alternative to traditional row system for cotton production.
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In press - Online First. Article has been peer reviewed, accepted for publication and published online without pagination. It will receive pagination when the issue will be ready for publishing as a complete number (Volume 47, Issue 4, 2019). The article is searchable and citable by Digital Object Identifier (DOI). DOI link will become active after the article will be included in the complete issue.
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Johnson, W. Carroll, and Benjamin G. Mullinix. "Potential Weed Management Systems for Organic Peanut Production." Peanut Science 35, no. 1 (January 1, 2008): 67–72. http://dx.doi.org/10.3146/ps01-007.1.
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Abstract Studies were conducted near Tifton, GA to develop weed management systems for organic peanut production. Trials in 2004 and 2005 evaluated row patterns (two levels), remedial weed control (four levels), and cultivation (three levels). Row patterns were wide rows (91 cm apart) and narrow rows (30 cm apart). Remedial weed control was early-season applications of clove oil, citric plus acetic acid, broadcast propane flaming, and a nontreated control. Cultivation regimes were 1X or 2X sweep cultivation and a non-cultivated control. The experimental sites had heavy natural infestations of annual grasses and broadleaf weeds. None of the treatment combinations effectively controlled weeds season-long and resulting peanut yields were poor. Annual grasses were particularly troublesome due to ineffective control from flaming and citric plus acetic acid. Clove oil was slightly more effective in controlling annual grasses than the other remedial treatments, but annual grass control was still unacceptable. Dicot weeds were not effectively controlled by mid-season, although clove oil and flaming controlled the seedling weeds early season. The lack of residual weed control by the remedial weed control treatments resulted in heavy weed infestations by mid-season. Poor control of annual grasses, no residual weed control, and high cost of remedial treatments indicates that these systems of weed management in organic peanut production are not suited to sites with heavy weed infestations.
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Kellas, JD, PR Bird, KN Cumming, GA Kearney, and AK Ashton. "Pasture production under a series of Pinus radiata-pasture agroforestry systems in South-West Victoria, Australia." Australian Journal of Agricultural Research 46, no. 6 (1995): 1285. http://dx.doi.org/10.1071/ar9951285.
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Net pasture production has been monitored over time on an on-going Pinus radiata-pasture agroforestry experiment located at Carngham, Victoria. Established in 1983 by thinning a 2-year-old plantation, the study contains five treatments (systems): open pasture (no trees), 60 trees/ha, 200 trees/ha wide-spaced, 200 trees/ha 5-row belt and 1360 trees/ha. Net pasture production was only weakly affected by the proximity of trees in the 60 trees/ha and 200 trees/ha wide-spaced systems. However, in the 200 trees/ha 5-row belt system, pasture production was often significantly less within the tree zone and at 1.5 m from the tree edge compared with production at 10.5 m from the tree edge. While there was a trend for greater pasture production at 10.5 m and 18 m from the tree line than occurred in the open pasture system, the width of pasture adjacent to the 5-row belts was too narrow (36 m) to demonstrate any shelter benefit on pasture production. From 1990 to 1992, pasture production (kg ha-1) for each system was similar, although production tended to decrease with increasing tree stocking. Following the cessation of pruning (1992), pasture production was significantly reduced by increased tree stocking, such that pasture production in the 200 trees/ha wide-spaced and 200 trees/ha 5-row belt systems was 60% and 69% and 23% and 67% of open pasture in 1993 and 1994 respectively.
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Geddes, Charles M., and Robert H. Gulden. "Candidate Tools for Integrated Weed Management in Soybean at the Northern Frontier of Production." Weed Science 66, no. 5 (September 2018): 662–72. http://dx.doi.org/10.1017/wsc.2018.32.
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AbstractThe development of early-maturing soybean [Glycine max(L.) Merr.] varieties has led to an increase in soybean production in canola (Brassica napusL.)-dominant crop rotations in western Canada. Herbicide-resistant (HR) volunteerB. napuscan be difficult to manage in HR soybean using herbicides alone. In 2013 and 2014, four field experiments were conducted in Manitoba, Canada, to evaluate soybean row spacing, seeding density, nitrogen supply, and interrow tillage as candidate nonchemical weed management tools for an integrated program to manage volunteerB. napusin soybean. Among treatments and sites, volunteerB. napusproduced about 830 seeds plant−1and resulted in large seedbank inputs (averaging about 20,300 seeds m−2). VolunteerB. napusseedling recruitment differed among sites, and resulted in two distinct classes of sites based on average seedling densities of 39 and 89 plants m−2. Weed management tools were more effective at the sites with higher volunteerB. napusdensities. At these sites, soybean yield was greater when using an increased soybean-seeding density (44% greater yield using a seeding density of 682,500 vs. 455,000 seeds ha−1) or interrow tillage (36% greater yield with vs. without using interrow tillage). Soybean row spacing (19 vs. 38 vs. 76 cm) did not affect soybean yield, unless the reduction in row spacing was combined with an increased seeding density (65% greater yield with narrow-row soybean seeded at 682,500 vs. wide-row soybean seeded at 455,000 seeds ha−1). At the sites with higher volunteerB. napusdensities, seed production of canola volunteerB. napuswas greater when nitrogen fertilizer was applied to simulate an environment with greater nitrogen supply (77% greater number of volunteerB. napusseeds produced with vs. without broadcast application of 23 kg N ha−1urea). In northern climates, seeding soybean at increased densities using narrow-row spacing in fields with limited soil inorganic nitrogen and using interrow tillage in wide-row production systems are effective strategies that could augment chemical weed management in an integrated program for management of volunteerB. napus, and perhaps also other competitive early-season weeds.
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Jackson, Ryan E., and Henry N. Pitre. "Influence of Roundup Ready Soybean Production Systems and Glyphosate Application on Pest and Beneficial Insects in Narrow-Row Soybean." Journal of Entomological Science 39, no. 1 (January 1, 2004): 62–70. http://dx.doi.org/10.18474/0749-8004-39.1.62.
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Roundup Ready® soybeans, Glycine max (L.) Merrill, in narrow-row planting systems were investigated in 1998 in Mississippi to evaluate the effects of the transgenic crop and glyphosate herbicide on pest and beneficial insects. Insects found in sufficient numbers for meaningful analysis included adult bean leaf beetle, Cerotoma trifurcata (Forster); adult three-cornered alfalfa hopper, Spissistilus festinus (Say); adult big-eyed bug, Geocoris punctipes (Say), and; larvae of green cloverworm, Plathypena scabra (F.), and velvetbean caterpillar, Anticarsia gemmatalis (Hübner). Populations of C. trifurcata, S. festinus, P. scabra and A. gemmatalis were not reduced in genetically altered Roundup Ready soybean, or by recommended (by label) or delayed applications of glyphosate. Numbers of G. punctipes also were not reduced in Roundup Ready soybean, but were reduced by recommended applications of glyphosate during weeks three and four following the second recommended herbicide application. Geocoris punctipes densities also were reduced at 1 and 2 wks after the first glyphosate application in plots in which the second application of glyphosate was delayed. Numbers of G. punctipes may have been indirectly reduced by glyphosate within sample weeks two and three because of variations in weed densities after treatment with the herbicide.
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Paynter, Blakely H. "Wide Row Spacing and Rigid Ryegrass (Lolium rigidum) Competition Can Decrease Barley Yield." Weed Technology 24, no. 3 (September 2010): 310–18. http://dx.doi.org/10.1614/wt-d-09-00062.1.
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Field studies compared the grain yield of four two-row spring barley cultivars at four sites when sown at two-row spacing in competition with two densities of rigid ryegrass. The sites chosen had low background populations of rigid ryegrass. Although the four cultivars sown differed in their grain yield, row spacing did not influence cultivar performance. Doubling the row spacing decreased barley grain yield at three of the four sites. The impact of row spacing on grain yield was more noticeable when doubled to 48 or 50 cm compared with 36 cm. Rigid ryegrass competition reduced barley grain yield at two of the four sites. At both locations the influence of weed competition on barley grain yield was the same at both narrow and wide row spacing and at one location the impact of weed competition was modified by cultivar. Planting barley in wide rows was found to favor rigid ryegrass production through an increase in both rigid ryegrass biomass production and tiller number. The development of farming systems for barley on the basis of a row spacing greater than 25 cm is likely to be associated with an increase in weed productivity unless good integrated weed management principles are implemented. Modifications to the current system may allow an increase in row spacing without any yield loss or increased weed seed set.
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Butts, Thomas R., Jason K. Norsworthy, Greg R. Kruger, Lowell D. Sandell, Bryan G. Young, Lawrence E. Steckel, Mark M. Loux, et al. "Management of Pigweed (Amaranthusspp.) in Glufosinate-Resistant Soybean in the Midwest and Mid-South." Weed Technology 30, no. 2 (June 2016): 355–65. http://dx.doi.org/10.1614/wt-d-15-00076.1.
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Pigweeds are among the most abundant and troublesome weed species across Midwest and mid-South soybean production systems because of their prolific growth characteristics and ability to rapidly evolve resistance to several herbicide sites of action. This has renewed interest in diversifying weed management strategies by implementing integrated weed management (IWM) programs to efficiently manage weeds, increase soybean light interception, and increase grain yield. Field studies were conducted across 16 site-years to determine the effectiveness of soybean row width, seeding rate, and herbicide strategy as components of IWM in glufosinate-resistant soybean. Sites were grouped according to optimum adaptation zones for soybean maturity groups (MGs). Across all MG regions, pigweed density and height at the POST herbicide timing, and end-of-season pigweed density, height, and fecundity were reduced in IWM programs using a PRE followed by (fb) POST herbicide strategy. Furthermore, a PRE fb POST herbicide strategy treatment increased soybean cumulative intercepted photosynthetically active radiation (CIPAR) and subsequently, soybean grain yield across all MG regions. Soybean row width and seeding rate manipulation effects were highly variable. Narrow row width (≤ 38 cm) and a high seeding rate (470,000 seeds ha−1) reduced end-of-season height and fecundity variably across MG regions compared with wide row width (≥ 76 cm) and moderate to low (322,000 to 173,000 seeds ha−1) seeding rates. However, narrow row widths and high seeding rates did not reduce pigweed density at the POST herbicide application timing or at soybean harvest. Across all MG regions, soybean CIPAR increased as soybean row width decreased and seeding rate increased; however, row width and seeding rate had variable effects on soybean yield. Furthermore, soybean CIPAR was not associated with end-of-season pigweed growth and fecundity. A PRE fb POST herbicide strategy was a necessary component for an IWM program as it simultaneously managed pigweeds, increased soybean CIPAR, and increased grain yield.
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Jaskulska, Iwona, and Dariusz Jaskulski. "Winter Wheat and Spring Barley Canopies under Strip-Till One-Pass Technology." Agronomy 11, no. 3 (February 26, 2021): 426. http://dx.doi.org/10.3390/agronomy11030426.
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Modern agriculture promotes non-inversion, ploughless tillage systems, and simplified plant cultivation methods. Environmentally friendly plant production technologies must nevertheless guarantee high yields of good quality. In the years 2017/18–2019/20, studies were carried out in which it was assumed that these conditions could be met by strip soil tillage with simultaneous application of fertilisers and paired-row sowing (strip-till one-pass (ST-OP). Two field experiments were conducted to compare two cereal cultivation technologies: ploughless, non-inversion tillage, seedbed preparation, entire-surface fertilisation, and narrowly spaced row sowing (PL-ES); and ST-OP, with two narrow spaced rows (12 cm apart) in a strip of tilled (paired-row sowing), fertilised soil, and a 24.4-cm-wide inter-row of untilled soil. Fields of winter wheat and spring barley were investigated, assessing plant density and spatial variation, plant height, yield components, and yield. The morphological and physiological indices of the plants and canopies determined were leaf area index (LAI), photosynthetically active radiation (PAR), leaf stomatal conductance, and relative chlorophyll content in leaves. The ST-OP technology provides uniform planting in the canopy, especially under conditions of insufficient rainfall. Fields of winter wheat and spring barley cultivated by this method featured shorter plants with more stalks with spikes, and spikes with greater weight and number of grains, than in the fields of cereals grown under PL-ES. The LAI and PAR indices in the narrow inter-rows were similar to the PL-ES technology and higher than in the wide, untilled inter-rows. Leaves of cereals grown under ST-OP contained more chlorophyll and had a higher leaf stomatal conductance. This technology, which provides higher winter wheat and spring barley yields, is an alternative to ploughless tillage with row sowing.
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Souza, Diego Miranda de, Carlos Gilberto Raetano, Caio Alexandre Ferreira Moreira, Regiane Cristina Oliveira de Freitas Bueno, and Marina Mouzinho Carvalho. "Effects of news sowing arrangements and air assistance on fungicide spray distribution on soybean crop." Acta Scientiarum. Agronomy 41 (September 5, 2019): e42700. http://dx.doi.org/10.4025/actasciagron.v41i1.42700.
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The density and distribution of soybean plants can interfere in the plant growth stage and yield, as well as phytosanitary management of this crop. Thus, innovations in production systems must be followed by improvements in pesticide application technology. Therefore, this study aimed to evaluate the influence of soybean sowing arrangements on fungicide application technology, with or without air assistance in the spray boom, using qualitative and quantitative assessments of the spray deposits. In the experiments, a randomized block design with split plots was used. Four soybean sowing arrangements: Conventional (CO), Double row (DR), Narrow row (NR), and Crossed rows (CR) composed the main plots, and fungicide application technologies with air assistance (AA) and without air assistance (WA) in the spray boom composed the subplots, with four replications. For the assessment of spray deposits, Brilliant Blue tracer dye was used in the spray solution, and the spray coverage was evaluated using water-sensitive papers. The effects of different soybean sowing arrangements on deposits and spray coverage were limited. However, an increase in spray deposits on the lower part of the soybean plants was observed with air assistance in the spray boom.
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Sandler, Leah, Kelly A. Nelson, and Christopher Dudenhoeffer. "Winter Wheat Row Spacing and Alternative Crop Effects on Relay-Intercrop, Double-Crop, and Wheat Yields." International Journal of Agronomy 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/369243.
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In Missouri as well as much of the Midwest, the most popular double-cropping system was winter wheat (Triticum aestivumL.) followed by soybean (Glycine max(L.) Merr). These two crops can also be used in an intercrop system, but optimal row spacing was important to increase crop productivity. Research was conducted to evaluate (1) winter wheat inter- and double-crop production systems, using a variety of alternative crops, and (2) the impact of different wheat row spacings on intercrop establishment and yields within the various cropping systems. Field research was conducted during droughts in 2012 and 2013. Spacing of wheat rows impacted wheat yields by 150 kg ha−1, as well as yields of the alternative crops. Narrower row spacings (150 kg ha−1) and the double-crop system (575 kg ha−1) increased yield due to the lack of interference for resources with wheat in 2013. Land equivalent ratio (LER) values determining productivity of intercrop systems of 19 and 38 cm row showed an advantage for alternative crops in 2013, but not 2012. This signified that farmers in Northeast Missouri could potentially boost yield potential for a given field and produce additional forage or green manure yields in a year with less severe drought.
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Cogato, Alessia, Andrea Pezzuolo, Claus Grøn Sørensen, Roberta De Bei, Marco Sozzi, and Francesco Marinello. "A GIS-Based Multicriteria Index to Evaluate the Mechanisability Potential of Italian Vineyard Area." Land 9, no. 11 (November 22, 2020): 469. http://dx.doi.org/10.3390/land9110469.
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Planting criteria of new vineyards should comply with rational and sustainable criteria, taking into account the potential mechanisability of existing viticultural areas. However, an established methodology for this assessment is still lacking. This study aimed at analysing the parameters which influence the vineyard mechanisability, with the objective to propose a new mechanisability index. The mechanisability index proposed was based on GIS-analysis of landscape and management parameters such as mean slope, shape of the vineyard block, length-width ratio, headland size, training system and row spacing. We identified a sample of 3686 vineyards in Italy. Based on the above-mentioned parameters, vineyards were categorised by their level of mechanisability (l.m.) into four classes. Moreover, we analysed the correlation between l.m. and economic indicators (area planted with vineyard and wine production). Results showed that the main factors limiting the mechanisability potential of some Italian regions are the elevated slopes, horizontal training systems and narrow vine spacings. The l.m. showed a moderate positive correlation with the size of vineyards and the volume and value of production. The methodology presented in this study may be easily applied to other viticultural areas around the world, serving as a management decision-making tool.
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Paynter, Blakely H., and Andrea L. Hills. "Barley and Rigid Ryegrass (Lolium rigidum) Competition is Influenced by Crop Cultivar and Density." Weed Technology 23, no. 1 (March 2009): 40–48. http://dx.doi.org/10.1614/wt-08-093.1.
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Western Australian growers are adopting no-tillage farming systems, which have a greater reliance on integrated weed management systems that include competitive cultivars, high seeding rates, strategic fertilizer placement, and narrow row spacing. At the same time, they are sowing more of their barley area to cultivars with a semidwarf habit. This study compared six two-row, spring malting barley cultivars with different morphological traits at two dates of planting and three crop densities, with nil-added and added rigid ryegrass at five sites. Four cultivars, ‘Buloke’, ‘Flagship’, ‘Hamelin’, and ‘Vlamingh’, had an erect early growth habit; the other two, ‘Baudin’ and ‘Gairdner’, had a prostrate, semidwarf early growth habit. Increasing the density of rigid ryegrass plants from 16 to 125 plants/m2decreased barley grain yield by reducing crop biomass production, tiller number, grain number, and harvest index. Average grain weight was also reduced at most sites. The impact of competition on grain yield varied across sites and cultivars, but did not interact with date of planting. Baudin, Flagship, and Hamelin were more competitive with rigid ryegrass than Buloke, Gairdner, and Vlamingh. Differences in competitiveness between cultivars did not appear to be strongly related to morphological traits that affect light interception such as canopy closure, plant height, and tiller number. Differences in cultivar competitiveness were cultivar-specific and not generic. Rigid ryegrass productivity (dry matter and tiller number) tended to be lower under the more competitive cultivars. Increasing barley plant density increased grain yield, and reduced both rigid ryegrass dry matter and tiller number. Barley density had a larger impact on rigid ryegrass productivity than crop cultivar. The impact of barley density on reducing rigid ryegrass tiller number was larger with the first planting date than the second, and higher in the added rigid ryegrass plots than the nil-added plots. This study highlights the importance of high barley seeding rate for the integrated management of rigid ryegrass.
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Mauri, Silvia G., H. C. Bittenbender, Kent D. Fleming, and Loren D. Gautz. "Economic Evaluation of Mechanized Pruning of Coffee in Hawaii." HortTechnology 13, no. 3 (January 2003): 468–72. http://dx.doi.org/10.21273/horttech.13.3.0468.
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Marketable coffee (Coffea arabica) yield and cost of production under two systems of mechanized pruning—hedging and stumping— were investigated. Data were collected from 1997 to 2001—a single pruning cycle—on three cultivars on three farms on Kauai, Maui, and Molokai. Treatments were variations of hedging and stumping, including time of pruning, methods of re-growth control, and tree in-row spacing were applied to each coffee cultivar. Economic evaluation was based on a partial budget analysis of the actual costs per year of the different pruning systems used on each farm. Mechanical pruning costs per acre for best hedging and stumping treatments across cultivars were 90% and 83% less, respectively, than the current practice of manual pruning. Response to pruning system varied according to coffee cultivar, tree in-row spacing and farm location. The tall cultivar Mokka had higher yields when hedged at 5 ft (1.5 m) tall and 5 ft wide, and the semi-dwarf cultivar Yellow Catuai had higher yields when stumped at 2 ft (0.6 m) tall. Hedge pruning should be done early in the year, January to February, for the semi-dwarfs, `Yellow Catuai' and `Red Catuai', but can be delayed until May for `Mokka'. Annual topping in the hedging systems should be done January to May for `Yellow Catuai' but maybe delayed until May for `Mokka' and `Red Catuai' without yield loss. The economic evaluation revealed that the cost of stumping was higher than hedging. For `Yellow Catuai' on Kauai the economic evaluation indicated that although the cost of stumping was higher, the accompanying higher yields resulted in a higher gross margin for this system. When stumping, verti- cal branches can be set with a contact herbicide spray to avoid higher hand pruning costs without lowering yields. Stumps should be narrowed after stumping if spaced, 2.5 ft (0.75 m) the current standard in-row spacing for mechanical harvesting. Wide in-row spacing (5 ft) should be considered by growers when planting or re-planting.
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SINGH, A., M. SINGH, and K. SINGH. "Productivity and economic viability of a palmarosa–pigeonpea intercropping system in the subtropical climate of north India." Journal of Agricultural Science 130, no. 2 (March 1998): 149–54. http://dx.doi.org/10.1017/s0021859697005224.
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The poor viability of the perennial aromatic grass, palmarosa (Cymbopogon martinii Stapf. var. motia), in the first year of planting, restricts its popularity among farmers in India. Two pigeonpea cultivars, Bahar (late maturing), and UPAS–120 (early maturing) were intercropped at different row spacings with palmarosa at a row spacing of 60 cm, in the subtropical climate of Lucknow, north India in 1988/89 and 1989/90. Intercropping with the late maturing cv. Bahar at 300 cm row spacing produced 1·26 t/ha grain (2-year mean) without affecting the growth and yield of the palmarosa. Intercropping improved land-use efficiency by 47%, relative net return by 58% and net economic return by Rs. 12500/ha over a sole palmarosa crop. The grain, stalk and total dry matter yield per plant of pigeonpea was considerably improved when grown at the wider row spacing in the intercropped system than when grown as a sole crop. This indicates that the competition between pigeonpea plants was not reduced when palmarosa was present. Palmarosa tiller production and herb and oil yield were significantly reduced when the distance between rows of pigeonpea was narrowed, demonstrating both the greater susceptibility of palmarosa to lack of light, and also that in palmarosa–pigeonpea intercropping systems, competition exists mainly for light rather than for nutrients and moisture, possibly because the two crop components acquire their nutrients and moisture from different soil layers.Intercropping with the high yielding, late maturing pigeonpea cultivar, Bahar, at 300 cm row distance is recommended to make palmarosa cultivation economically viable in the first year of planting. The selection of high yielding, late maturing pigeonpea cultivars with an upright growth habit is suggested as a further way of improving the economic benefits of a palmarosa–pigeonpea intercropping system.
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Boano, Fulvio, Silvia Fiore, and Roberto Revelli. "Chlorate formation in water distribution systems: a modeling study." Journal of Hydroinformatics 18, no. 1 (January 21, 2015): 115–25. http://dx.doi.org/10.2166/hydro.2015.079.
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Chlorine-based disinfection agents are known to favor the production of disinfection by-products (DBPs), whose concentrations are restricted by international guidelines to ensure a safe consumption of drinking water. Hence, it is important to understand the behavior of DBPs within water distribution networks (WDNs) to avoid users' exposure to concentrations higher than guideline values. The build-up in chlorate concentration resulting from chlorinated disinfectants is here simulated with the EPANET 2.0 software for one benchmark WDN serving about 130,000 inhabitants. Chlorate generation was accounted by means of an empirical model, considering different boundary conditions (physicochemical features of raw water, disinfectant dose). The gathered results indicate that increases in chlorate concentration within the considered WDN are narrow. Chlorate neo-formation in the WDN is, however, strictly related to the initial amount of chlorate released by the water treatment plant, i.e., to the input value in the WDN. If chlorate concentration in treatment plants is kept below 700 μg/L (i.e., World Health Organization guideline), depending on the mixing conditions in tanks, the simulation results referred to the considered WDN show that the DBP build-up within the network is limited (in any case lower than 5–7% of the threshold value).
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Yeo, John R., Jerry E. Weiland, Dan M. Sullivan, and David R. Bryla. "Nonchemical, Cultural Management Strategies to Suppress Phytophthora Root Rot in Northern Highbush Blueberry." HortScience 52, no. 5 (May 2017): 725–31. http://dx.doi.org/10.21273/hortsci11437-16.
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Phytophthora cinnamomi Rands causes root rot of northern highbush blueberry (Vaccinium corymbosum L.), which decreases plant growth, yield, and profitability for growers. Fungicides are available to suppress the disease, but are prone to development of resistance in target pathogens and cannot be used in certified organic production systems. Alternative, nonchemical, cultural management strategies were evaluated to reduce phytophthora root rot in a field infested with P. cinnamomi. The field was planted with ‘Draper’ blueberry, which is highly susceptible to the pathogen. The soil was either amended with gypsum or not before planting, and the plants were irrigated using narrow (adjacent to plant crown) or widely spaced (20 cm on either side of the plant crown) drip lines and mulched with douglas fir sawdust or black, woven geotextile fabric (weed mat). A fungicide control treatment was also included in the study and consisted of applying two conventional fungicides, mefenoxam and fosetyl-Al, to plants irrigated with narrow drip lines and mulched with sawdust. Initially, root infection by P. cinnamomi was lower with the combination of gypsum, wide drip lines, and sawdust mulch than with any other treatment, except the fungicide control. The soil under weed mat accumulated more heat units than under sawdust and resulted in faster hyphal growth by the pathogen. However, plant growth was similar in both mulch types. The effects of drip line placement and gypsum, on the other hand, were interactive, and plants grown with a combination of wide drip lines and gypsum produced the greatest amount of biomass among the cultural treatments. Narrow drip lines negated the disease-suppressive effects of gypsum by moving zoospore-inhibiting Ca2+ away from the plant root zone, and also resulted in wetter soil near the crown of the plants, which likely promoted zoospore discharge and root infection. However, wide drip lines resulted in N deficiency symptoms during the first year after planting and, therefore, resulted in less plant growth than the fungicide control. Thus, if N is managed properly, this study suggests that concerted use of gypsum and wide drip lines can help suppress phytophthora root rot in northern highbush blueberry and increase production in field soils where the pathogen is present.
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J. R. Williford. "Production of Cotton on Narrow Row Spacing." Transactions of the ASAE 35, no. 4 (1992): 1109–12. http://dx.doi.org/10.13031/2013.28707.
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Bondarev, A. V., E. T. Zhilyakova, N. B. Demina, and E. Yu Timoshenko. "Prospects for the Use of Medical Clays (Review)." Drug development & registration 8, no. 4 (November 26, 2019): 27–31. http://dx.doi.org/10.33380/2305-2066-2019-8-4-27-31.
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Introduction. The article deals with the aspects of the use of Medical Clays in Pharmaceutical Technology. A review of the traditional areas of application of Medical Clay, as well as highlighting new directions.Text. One of the main problems of domestic industrial pharmacy is a narrow nomenclature of active pharmaceutical substances and excipients. Replenishment of the nomenclature occurs in two ways-through the synthesis of new chemical compounds or through the processing of natural raw materials of animal, plant or mineral origin. In the process of purification and processing of mineral raw materials, Medical Clays are obtained, which are now widely used as active pharmaceutical substances for the production of Enterosorbents, as well as auxiliary substances.Conclusion. A review of perspectives and areas of use of Medicinal Clays have shown that at present, Medical Clays used in the three traditional areas: cutaneous application, application per os, application in pharmaceutical and food technology. A promising direction is the use of Medical Clays as transport drug systems. The study of this information array and its generalization has undoubted practical and scientific significance in modern pharmaceutical technology.
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K. C. Stone, P. J. Bauer, W. J. Busscher, and J. A. Millen. "Narrow Row Corn Production with Subsurface Drip Irrigation." Applied Engineering in Agriculture 24, no. 4 (2008): 455–64. http://dx.doi.org/10.13031/2013.25146.
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Graterol, Y. E., R. W. Elmore, and D. E. Eisenhauer. "Narrow-Row Planting Systems for Furrow-Irrigated Soybean." Journal of Production Agriculture 9, no. 4 (October 1996): 546–52. http://dx.doi.org/10.2134/jpa1996.0546.
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Howe, Otis W., and Lawrence R. Oliver. "Influence of Soybean (Glycine max) Row Spacing on Pitted Morningglory (Ipomoea lacunosa) Interference." Weed Science 35, no. 2 (March 1987): 185–93. http://dx.doi.org/10.1017/s0043174500079030.
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The interference and seed production potential of pitted morningglory (Ipomoea lacunosaL. # IPOLA) with conventional-row (1 m) and narrow-row (20 cm) ‘Hill’ soybeans [Glycine max(L.) Merr.] was studied for 2 yr. Pitted morningglory densities were 3.3, 10, 20, and 40 plants/m2while soybean densities were 23 and 50 plants/m2in conventional and narrow rows, respectively. Pitted morningglory interfered with soybean growth earlier in conventional-row soybeans than in narrow-row soybeans due to its rapid increase in leaf area index (LAI) and biomass from 4 to 8 weeks after emergence. Soybeans were competitive with pitted morningglory until the soybean reproductive stage began at 7 weeks after emergence. Pitted morningglory reduced soybean yields 17% more in a dry year than in a wet year. Yield of narrow-row soybeans was equal or greater than yield of conventional-row soybeans at all pitted morningglory densities. Conventional-row soybean yields were reduced an average of 42 and 81% at pitted morningglory densities of 3.3 and 40/m2, respectively, but yield of narrow-row soybeans was reduced only 6 and 62% at equivalent densities. Pitted morningglory grown without soybean interference produced an average of 52.3 million seeds/ha. Total seed production of pitted morningglory growing in soybeans increased as pitted morningglory density increased and was greater in conventional rows than in narrow rows. Narrow rows reduced total seed production an average of 90 and 68% at pitted morningglory densities of 3.3 and 40/m2, respectively.
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Strieder, Mércio Luiz, Paulo Regis Ferreira da Silva, Lisandro Rambo, Luís Sangoi, Adriano Alves da Silva, Paulo César Endrigo, and Douglas Batista Jandrey. "Crop management systems and maize grain yield under narrow row spacing." Scientia Agricola 65, no. 4 (2008): 346–53. http://dx.doi.org/10.1590/s0103-90162008000400004.
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Reduction in row spacing provides a more uniform distribution among plants that can increase grain yield. The benefits of narrow row spacing can depend on the plant architecture and on the kind of crop management system. The objective of this study was to assess the effects of narrow row spacing on the grain yield of maize hybrids growing under different management systems. Six experiments were carried out in Eldorado do Sul, State of Rio Grande do Sul, Brazil, during the 2003/04 and 2004/05 growing seasons. Each experiment corresponded to a crop management system. Treatments consisted of two row spacings (0.8 and 0.4 m), two hybrids (Penta and Flash) and two plant densities, which varied with the crop management system and growing season. Besides plant density, the crop management systems differed in the quantities of fertilizers applied at sowing, side-dress and use of irrigation. A complete randomized block design was used in each experiment, in a 2 × 2 × 2 treatment factorial scheme with four replications. The increases in grain yield with narrow row spacing were small, ranging from zero to 14%. They depended on the growing season and were manifested only with yields higher than 10 t ha-1, regardless of the hybrid. The number of grains per area was the component that best explained the response of grain to narrow row spacing, regardless of plant density, hybrid and crop management system. Narrow row spacing is a worth management strategy to enhance maize grain yield when high input cropping systems are used.
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Smith, Richard M., Gurpreet Kaur, John M. Orlowski, Gurbir Singh, Daryl Chastain, Trent Irby, L. Jason Krutz, Larry Falconer, and Donald R. Cook. "Narrow-Row Production System for Soybeans in Mississippi Delta." Crop, Forage & Turfgrass Management 5, no. 1 (2019): 190015. http://dx.doi.org/10.2134/cftm2019.02.0015.
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Burnside, O. C., and R. S. Moomaw. "Narrow Row Soybean Production in Untilled Oat Stubble 1." Agronomy Journal 77, no. 1 (January 1985): 36–40. http://dx.doi.org/10.2134/agronj1985.00021962007700010010x.
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Fritz, Vincent A., Carl J. Rosen, and Roger L. Becker. "Impact of Narrow Row Production on Yield Recovery, Nitrogen Use Efficiency, and Weed Competition in Sweet Corn." HortScience 33, no. 3 (June 1998): 523d—523. http://dx.doi.org/10.21273/hortsci.33.3.523d.
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The processing industry is beginning to adopt narrow row configurations for sweet corn production thinking that plants spaced more equidistant will compete less with each other and weeds, improving yield potential and production efficiency. However, empirical knowledge relating to whether these proposed benefits change with hybrid, N fertility, and planting date is lacking. Narrow row (56 cm apart) sweet corn production was evaluated for improved production efficiency over the “traditional” row configuration (76 cm apart) at identical plant populations (60,000/ha). Yield from seed planted in narrow rows on 1 May was significantly higher than traditional row configuration. Increasing N fertilizer rate (0, 68, 136 kg N/ha) also yielded a positive linear response in yield across the three hybrids. As planting date progressed later into the season (27 May and 19 June), narrow row configuration benefits observed earlier began to diminish. Although increased N fertilizer rates continued to show a positive yield response across all planting dates, the degree of the slope decreased as planting date was progressively delayed suggesting a greater rate of N mineralization from the soil. Plant leaf samples were collected from each plot at silking for N analysis and determination of N use efficiency. Degree of canopy closure was dependent on plant architecture of the hybrid and N fertilizer rate; and may be related to postemergence weed competition and yield potential. The decision to convert to narrow row production would require a significant capital investment in new equipment. An economic assessment of the equipment required in addition to more detailed information on yield response to the narrow row configuration will help the processor make an informed choice when considering conversion.
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Kurakov, F. A. "STRATEGIES FOR RETENTION GLOBAL LEADERSHIP OF SMALL HIGH-TECH COMPANIES IN NARROWLY FOCUSED MARKETS." Economics of Science 4, no. 2 (September 17, 2018): 115–26. http://dx.doi.org/10.22394/2410-132x-2017-4-2-115-126.
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In the absence of the development of exports of high-tech industries, the implementation of strategic tasks for the accelerated growth of the economy set by the Decree of the President of the Russian Federation “On national goals and strategic objectives of the development of the Russian Federation until 2024” of May 7, 2018 No. 240 is unlikely. According to most researchers, the main potentially possible commodity items in non-raw materials exports, which are in demand in the world markets, are the products of engineering, pharmaceutical industry, apparatus and devices used in medicine. Therefore, the right to participate in foreign economic activity is delegated, first of all, to large domestic companies. However, today Russia is a country with a large assortment of production of simple products, which requires building a systematic approach in the formation of both economic policy in general and export in particular in the direction of developing of non-resource industries that produce high-tech products. The analysis of the strategies for retaining the leading positions in narrow niche segments in the global market, analysis of the competitive and diversifying strategy of the German company Poly-clip System, which is the world’s leading producer of clipping systems and the world leader in the food packaging segment was performed.
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Steckel, Lawrence E., and Christy L. Sprague. "Late-Season Common Waterhemp (Amaranthus rudis) Interference in Narrow- and Wide-Row Soybean." Weed Technology 18, no. 4 (December 2004): 947–52. http://dx.doi.org/10.1614/wt-03-131r.
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Field studies were conducted in 2000, 2001, and 2002 at Urbana, IL, to examine the interference potential of common waterhemp that emerged at soybean growth stages VE, V2-V3, V4-V5, R1-R2, and R3-R4 in 19- and 76-cm row soybean. Soybean row width and common waterhemp emergence timing significantly influenced common waterhemp density, biomass, seed production, mortality, and soybean yield loss. Common waterhemp density declined as emergence timings were at later soybean growth stages. This decline happened at earlier growth stages in narrow-row soybean. Significant reductions in common waterhemp biomass and seed production occurred at the V2-V3 and V4-V5 emergence timings for the narrow- and wide-row soybean, respectively. Common waterhemp seed production was more than 23,000 seeds per plant at the VE emergence timing for both soybean row widths. Survival of common waterhemp that emerged after the V4-V5 soybean growth stage was less than 20% in both row widths. Common waterhemp interference reduced soybean seed yield at the VE, V2-V3, and the V4-V5 emergence timings. Row width affected the magnitude of yield reductions at these interference timings, with reductions being less in narrow-row soybean. This research suggests that control measures need to be implemented to common waterhemp plants that emerge before V4-V5 soybean to protect soybean yield and reduce common waterhemp seed production.
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Zhang, Jiwei, Gerald N. Presley, Kenneth E. Hammel, Jae-San Ryu, Jon R. Menke, Melania Figueroa, Dehong Hu, Galya Orr, and Jonathan S. Schilling. "Localizing gene regulation reveals a staggered wood decay mechanism for the brown rot fungusPostia placenta." Proceedings of the National Academy of Sciences 113, no. 39 (September 12, 2016): 10968–73. http://dx.doi.org/10.1073/pnas.1608454113.
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Wood-degrading brown rot fungi are essential recyclers of plant biomass in forest ecosystems. Their efficient cellulolytic systems, which have potential biotechnological applications, apparently depend on a combination of two mechanisms: lignocellulose oxidation (LOX) by reactive oxygen species (ROS) and polysaccharide hydrolysis by a limited set of glycoside hydrolases (GHs). Given that ROS are strongly oxidizing and nonselective, these two steps are likely segregated. A common hypothesis has been that brown rot fungi use a concentration gradient of chelated metal ions to confine ROS generation inside wood cell walls before enzymes can infiltrate. We examined an alternative: that LOX components involved in ROS production are differentially expressed by brown rot fungi ahead of GH components. We used spatial mapping to resolve a temporal sequence inPostia placenta, sectioning thin wood wafers colonized directionally. Among sections, we measured gene expression by whole-transcriptome shotgun sequencing (RNA-seq) and assayed relevant enzyme activities. We found a marked pattern of LOX up-regulation in a narrow (5-mm, 48-h) zone at the hyphal front, which included many genes likely involved in ROS generation. Up-regulation of GH5 endoglucanases and many other GHs clearly occurred later, behind the hyphal front, with the notable exceptions of two likely expansins and a GH28 pectinase. Our results support a staggered mechanism for brown rot that is controlled by differential expression rather than microenvironmental gradients. This mechanism likely results in an oxidative pretreatment of lignocellulose, possibly facilitated by expansin- and pectinase-assisted cell wall swelling, before cellulases and hemicellulases are deployed for polysaccharide depolymerization.
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Bracy, Regina P., R. L. Parish, and W. A. Mulkey. "High-density Planting in a Precision Cultural System for Vegetable Production." HortTechnology 1, no. 1 (October 1991): 54–58. http://dx.doi.org/10.21273/horttech.1.1.54.
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A cultural system consisting of precision seeding on shaped beds, followed by cultivation using mechanically guided equipment, was developed and evaluated with several vegetable crops. The precision cultural system allowed for growing the crops at high plant populations by using precision planting and exact cultivation of multiple narrow rows of plants on wide beds. Eight field experiments were conducted from 1987 to 1989 on broccoli (Brassica oleracea var. botrytis L.), cabbage (Bra&a oleracea var. capitata L.), mustard (Brassica juncea var. crispfolia L.), and spinach (Spinacia oleracea L.) to evaluate production of these crops on single- and multiple-row configurations on narrow (1 -m) and wide (2-m) beds. The precision cultural system was assessed to be an excellent method for production of the small-seeded crops that were tested. Yield was highest for cabbage, mustard, and spinach planted in six rows on 2-m beds compared with four-, two-, or one-row beds. Multiple-row configurations did offer yield advantages over the single-row configuration for broccoli production.
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Schweitzer, L. E., W. E. Nyquist, J. B. Santini, and T. M. Kimes. "Soybean Cultivar Mixtures in a Narrow‐Row, Noncultivatable Production System 1." Crop Science 26, no. 5 (September 1986): 1043–46. http://dx.doi.org/10.2135/cropsci1986.0011183x002600050041x.
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Lindsey, Alexander J., Peter R. Thomison, Kirk Reese, Allen B. Geyer, Ashley Ritchie, Samuel Banks, and Matheus Ogando do Granja. "Does Narrow-Row Corn Production Influence Plants’ Response to Foliar Inputs?" Crop, Forage & Turfgrass Management 5, no. 1 (2019): 190039. http://dx.doi.org/10.2134/cftm2019.05.0039.
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Johnson, W. Carroll, Mark A. Boudreau, and Jerry W. Davis. "Cultural Practices to Improve In-Row Weed Control with Cultivation in Organic Peanut Production." Weed Technology 26, no. 4 (December 2012): 718–23. http://dx.doi.org/10.1614/wt-d-12-00019.1.
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Cultivation is a proven means of weed control in organic peanut. However, weeds present in-row often escape control. Research trials were conducted in Ty Ty, GA to modify cultural practices to help suppress weed emergence in-row. Modified cultural practices were three row pattern/seeding rate combinations; twin rows (four rows on a seedbed) seeded at the recommended (1X) seeding rate that produced 13 seed m−1in each row, twin rows seeded at the 2X seeding rate that produced 23 seed m−1in each row, and wide rows (two rows on seedbed) seeded at the recommended seeding rate that produced 23 seed m−1. Four cultivation regimes were evaluated; cultivation with a tine weeder at weekly intervals for 6 wk, cultivation with a tine weeder at weekly intervals for 8 wk, scouring with a brush hoe at vegetative emergence followed by the tine weeder for 6 wk, and a noncultivated control. There were no interactions between row pattern/seeding rates and cultivation regimes for any parameter measured. There was inconsistent response of weed control and peanut yield to row pattern/seeding rates. Weed control and peanut yields were similar with tine weeding for 6 wk, 8 wk, or with the brush hoe followed by the tine weeder. Weed management in organic peanut was not improved by altering peanut cultural practices that facilitate quicker canopy closure, and the use of narrow row patterns should not be based on attempts to improve weed control in organic peanut. Narrow row patterns provide other benefits to organic peanut production and those attributes should influence decisions on the choice of row pattern, not weed control.
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Colvin, Daniel L., Robert H. Walker, Michael G. Patterson, Glenn Wehtje, and John A. McGuire. "Row Pattern and Weed Management Effects on Peanut Production1." Peanut Science 12, no. 1 (January 1, 1985): 22–27. http://dx.doi.org/10.3146/pnut.12.1.0006.
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Abstract Field experiments were conducted from 1981 through 1983 on a Dothan sandy loam (Plinthic Paleudults) at Headland, Alabama, to investigate the effects of row patterns and weed management systems on weed control, peanut yield, and net returns to land and management. Treatments consisted of three row patterns, a) conventional 91-cm rows, b) dual twin 18-cm rows, and c) triple twin 18-cm rows, and six weed management systems ranging from none to various combinations of herbicide and mechanical inputs. The experimental area was naturally infested with bristly starbur (Acanthospermum hispidum DC), sicklepod (Cassia obtusifolia L.), Florida beggarweed [Desmodium tortuosum (Sw.) DC.], large crabgrass [Digitaria sanguinalis (L.) Scop.], and Texas panicum (Panicum texanum Buckl.). Results showed that weed control was affected somewhat by row patterns with broadleaf weeds being more responsive to row pattern manipulation than grass weeds. Weed fresh weights were generally lower as row patterns narrowed from conventional 91-cm spacing, however exceptions did occur. Highest yields and net returns were obtained when peanuts were planted in the dual twin 18-cm rows and weed management included benefin applied preplant incorporated, plus alachlor applied preemergence, and two timely cultivations.
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Baron, V. S., H. G. Najda, and F. C. Stevenson. "Influence of population density, row spacing and hybrid on forage corn yield and nutritive value in a cool-season environment." Canadian Journal of Plant Science 86, no. 4 (October 10, 2006): 1131–38. http://dx.doi.org/10.4141/p05-136.
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Increasing yield for silage and grazing in cool, short-season areas may be possible by planting corn (Zea mays L.) at high population densities and at narrow row spacing. The objective was to determine how population density (75 000, 100 000, and 125 000 plants ha-1) and row spacing (standard: 76 cm and narrow: 38 cm) affected whole-plant yield, yield-related parameters, and nutritive value of two corn hybrids grown at Brooks and Lacombe, Alberta during 2 yr. The hybrids (Pioneer 39F45 and 39N03) were rated at 2000 Ontario corn heat units (CHU). Trial, hybrid, population density and row spacing interacted to influence whole-plant yield. Population density had a greater impact on whole-plant yield than row spacing and hybrid choice. Generally, yield leveled off at 100 000 plants ha-1 when the interaction of all effects was considered. Leaf area index (LAI) and whole-plant yield at this density were 2.68 and 12.0 Mg ha-1, respectively. Narrow compared with standard row spacing had positive effects on whole-plant yield of one hybrid, but not the other and improved LAI at 75 000 plants ha-1, but not at the other plant densities. Increasing plant density and reducing row spacing had only minor effects on whole-plant nutritive value. Growing corn in narrow rows to accommodate prevalent planting equipment should have no adverse effects on whole-plant corn production in short-season areas of Canada. However, when considering changes in corn management to maximize whole-plant yield narrow row spacing is not as important as achieving a plant density of approximately 100 000 plants ha-1. Key words: Corn, Zea mays L., nutritive value, population density, row width, silage yield
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Stephenson, D. O., and B. J. Brecke. "Weed Management in Evenly-Spaced 38- vs. 76-cm Row Peanut (Arachis hypogaea)." Peanut Science 38, no. 1 (January 1, 2011): 66–72. http://dx.doi.org/10.3146/ps10-4.1.
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Abstract Research was conducted in Florida in 2005 through 2008 to evaluate weed management systems in narrow (38-cm)- and wide (76-cm)-row peanut. Benghal dayflower control increased when peanut row spacing was narrowed. Paraquat plus bentazon early-postemergence (EPOST) followed by (fb) imazapic or imazethapyr mid-postemergence (MPOST) or chlorimuron late-postmergence (LPOST) controlled Benghal dayflower at least 90%. Imazapic EPOST with or without 2,4-DB MPOST controlled Benghal dayflower 98 to 100%. Diclosulam or flumioxazin preemergence (PRE) fb paraquat plus bentazon EPOST fb 2,4-DB MPOST or either PRE herbicide fb 2,4-DB MPOST did not increase Benghal dayflower control compared with imazapic-containing treatments. Browntop millet control was 98 to 100% for treatments with imazapic or imazethapyr EPOST and control was greater in narrow-row compared to wide-row peanut. All herbicide treatments controlled pitted morningglory at least 90% and peanut row spacing did not influence control. Only treatments with imazapic EPOST as a component controlled sicklepod at least 90%. No difference between peanut row spacing was observed for sicklepod control. Peanut planted in narrow-rows yielded greater than wide-row peanut. Few differences in peanut yield were observed among herbicide treatments, but all herbicide treatments resulted in yields greater than the nontreated control. Data indicates that seeding peanut in narrow-rows will improve Benghal dayflower and browntop millet control and will increase peanut yield compared to wide-row peanut.
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Gerhards, Roland, Benjamin Kollenda, Jannis Machleb, Kurt Möller, Andreas Butz, David Reiser, and Hans-Werner Griegentrog. "Camera-guided Weed Hoeing in Winter Cereals with Narrow Row Distance." Gesunde Pflanzen 72, no. 4 (October 29, 2020): 403–11. http://dx.doi.org/10.1007/s10343-020-00523-5.
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Abstract Farmers are facing severe problems with weed competition in cereal crops. Grass-weeds and perennial weed species became more abundant in Europe mainly due to high percentages of cereal crops in cropping systems and reduced tillage practices combined with continuous applications of herbicides with the same mode of action. Several weed populations have evolved resistance to herbicides. Precision weed hoeing may help to overcome these problems. So far, weed hoeing in cereals was restricted to cropping practices with row distances of more than 200 mm. Hoeing in cereals with conventional row distances of 125–170 mm requires the development of automatic steering systems. The objective of this project was to develop a new automatic guidance system for inter-row hoeing using camera-based row detection and automatic side-shift control. Six field studies were conducted in winter wheat to investigate accuracy, weed control efficacy and crop yields of this new hoeing technology. A three-meter prototype and a 6-meter segmented hoe were built and tested at three different speeds in 150 mm seeded winter wheat. The maximum lateral offset from the row center was 22.53 mm for the 3 m wide hoe and 18.42 mm for the 6 m wide hoe. Camera-guided hoeing resulted in 72–96% inter-row and 21–91% intra-row weed control efficacy (WCE). Weed control was 7–15% higher at 8 km h−1 compared to 4 km h−1. WCE could be increased by 14–22% when hoeing was combined with weed harrowing. Grain yields after camera-guided hoeing at 8 km h−1 were 15–76% higher than the untreated control plots and amounted the same level as the weed-free herbicide plots. The study characterizes camera-guided hoeing in cereals as a robust and effective method of weed control.
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Bauer, Philip J., James R. Frederick, and Warren J. Busscher. "Tillage effect on nutrient stratification in narrow- and wide-row cropping systems." Soil and Tillage Research 66, no. 2 (July 2002): 175–82. http://dx.doi.org/10.1016/s0167-1987(02)00025-9.
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Forcella, Frank, Mark E. Westgate, and Dennis D. Warnes. "Effect of row width on herbicide and cultivation requirements in row crops." American Journal of Alternative Agriculture 7, no. 4 (December 1992): 161–67. http://dx.doi.org/10.1017/s0889189300004756.
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AbstractCrops grown in narrow rows (NR, 0.25 to 0.38 m) shade weed seedlings more than do those grown in traditional wide rows (WR, 0.76 m). NR crops may require less herbicide and interrow cultivation than WR crops for equally effective weed control. This hypothesis was tested by comparing weed control and crop yield in NR and WR crops when the following percentages of recommended application rates (RAR) of standard herbicides were applied: soybean, 0, 50 and 100%; sunflower, 0, 25, 50, and 100%; and corn, 0, 33, and 100% in three separate sets of experiments conducted over 2, 3, and 4 years, respectively. In all treatments with 100% RAR, excellent weed control prevented reductions in crop yield. When only 25 to 50% RAR was applied, weed control was consistently high in NR (82 to 99% control), but variable in WR (42 to 99% control). Weed control and crop yields typically were lowest in NR without herbicides. Interrow cultivation controlled 0 to 81% of weeds in WR crops. In reduced herbicide treatments (25 to 50% RAR), yields of NR soybean and sunflower typically were about equal to those in WR with 100% RAR, but NR corn yields were about 10% less. Considering the reduced herbicide use and lower weed control costs, planting corn, soybean, and sunflower in narrow rows may represent a practical form of low-input production of these important crops.
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Park, S. J. "Response of bush and upright plant type selections to white mold and seed yield of common beans grown in various row widths in southern Ontario." Canadian Journal of Plant Science 73, no. 1 (January 1, 1993): 265–72. http://dx.doi.org/10.4141/cjps93-041.
Full textAbstract:
White mold, caused by Sclerotinia sclerotiorum (Lib.) de Bary, is an important disease in common bean (Phaseolus vulgaris L.) production areas. It reduces seed yield and lowers the quality of beans. Development of the disease is thought to be affected by plant canopy type (architecture), and by genetic resistance. This study determined the effect of plant type and row width on white mold and seed yield. Three short bush/vine and four semi-determinate upright genotypes were tested in narrow (30 cm) and wide (60 and 80 cm) rows for 2 yr in a field prone to white mold development. Incidence and disease index increased as row width became narrower. The upright type was infected less than the short bush type. Ex Rico 23, which is a short vine, open canopy type, was moderately resistant to the mold. A tall upright selection, A55, showed the lowest mold infection; it was significantly less than that of Ex Rico 23. Seed yield of all genotypes increased as row width decreased even though there was an increase in white mold incidence. Stiff-strawed upright types had less lodging. To reduce white mold, cultivars should have lodging resistance, narrow canopied upright plant type and genetic resistance. Development of the upright plant types allows for narrow-row production and direct combining. Key words: Dry edible bean, Phaseolus vulgaris, white mold, Sclerotinia sclerotiorum, plant type, row width, seed yield
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Xie, H. S., D. R. S. Rourke, and A. P. Hargrave. "Effect of row spacing and seed/fertilizer placement on agronomic performance of wheat and canola in zero tillage systems." Canadian Journal of Plant Science 78, no. 3 (July 1, 1998): 389–94. http://dx.doi.org/10.4141/p97-063.
Full textAbstract:
Field experiments were carried out in Manitoba to investigate the agronomic response of zero till-grown spring wheat (Triticum aestivum L.) and canola (Brassica napus L.) to different row spacing and seed/fertilizer placement treatments. Wheat yield was very poor at 51-cm row spacing in comparison with those at 25- and 38-cm row spacings. Wheat performance between the row spacings of 25- and 38-cm was generally similar, especially coupled with paired-row seed/fertilizer placement; and canola performance tended to be better at 38-cm row spacing relative to 25-cm row spacing. Among three types of seed/fertilizer placement examined, paired-row placement resulted in the best performance in both wheat and canola, whereas crop response to narrow-row and wide-row seed/fertilizer placement varied with year. Therefore, with intensive crop management in zero tillage (ZT) system under the Manitoba conditions, the best crop performance in wheat and canola could be achieved with paired-row seed/fertilizer placement coupled with 25- to 38-cm row spacings. Key words: Yield, yield component, row spacing, seed/fertilizer placement, zero tillage
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Marshall, Michael W., and Ahmad Khalilian. "Effects of Tillage and Planting Methods on Narrow and Wide Row Cotton Production." Agricultural Sciences 09, no. 07 (2018): 792–803. http://dx.doi.org/10.4236/as.2018.97056.
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Black, Brent L., John M. Enns, and Stan C. Hokanson. "A Comparison of Temperate-climate Strawberry Production Systems Using Eastern Genotypes." HortTechnology 12, no. 4 (January 2002): 670–75. http://dx.doi.org/10.21273/horttech.12.4.670.
Full textAbstract:
Anticipating the phaseout of methyl bromide, the USDA-ARS small fruit breeding program at Beltsville, Md., discontinued soil fumigation in strawberry breeding and selection trials in the mid 1990s. To address resulting weed and pathogen pests, a modified or advanced matted row system was developed. This system uses matted row-type culture, established on raised beds with subsurface drip irrigation and organic mulch. The mulch is the residue of a killed cover crop that fixes some nitrogen and provides an economical, biodegradable mulch for suppressing weeds and reducing erosion. Since 1996, the small fruit breeding program has conducted replicated performance trials on both advanced matted row and a regional adaptation of annual hill plasticulture. Both of these systems were managed without methyl bromide fumigation or fungicide application. Data from these trials were used to compare advanced matted row and plasticulture for yield, fruit quality and harvest season. Yield for the two systems was genotype dependent, and the advanced matted row system had later production and slightly lower fruit quality.