Jason M. Sarver, Chad D. Lee, J. D. Green, James H. Herbek, James R. Martin
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引用次数: 0
摘要
降低抗草甘膦大豆的播率[Glycine max (L) Merr]。]可能影响除草剂施用的关键时间。在肯塔基州进行了四种环境下的田间研究,以确定播种量和草甘膦施用时间对大豆种子产量、杂草控制、生育期R1的截光和R5的冠层关闭的影响。大豆的播种率为75000、125000和175000粒/英亩,而草甘膦在播种后3周(WAP)、5周(WAP)、7周(WAP)或3周(amp;7 WAP。在四种环境中的两种,12.5万粒/英亩的种子产量高于7.5万粒/英亩。12.5万粒/英亩和17.5万粒/英亩之间没有产量差异。在3和7 WAP连续施用草甘膦以及在5 WAP单次施用草甘膦总是导致种子产量等于无杂草除草剂计划。在4种环境中,3种WAP处理的产量低于无杂草处理。在测量的任何因素中,播种率都不影响最佳喷施时间,这表明当播种率降低时,草甘膦除草剂计划不需要调整。
Evaluating the Influence of Various Seeding Rates on Weed Removal Timing in Glyphosate-Resistant Soybean
Reduced seeding rate in glyphosate-resistant soybean [Glycine max (L) Merr.] may influence the critical time of herbicide application. Field studies were conducted across four environments in Kentucky to determine the effect of seeding rate and glyphosate application timing on soybean seed yield, weed control, light interception at growth stage R1 and canopy closure at R5. Soybean was seeded at rates of 75,000, 125,000, and 175,000 seeds/acre, while glyphosate was applied at 3 weeks after planting (WAP), 5 WAP, 7 WAP, or 3 & 7 WAP. Seed yield at 125,000 seeds/acre was greater than at 75,000 seeds/acre rate in two of four environments. There were no yield differences between 125,000 and 175,000 seeds/acre. Sequential applications of glyphosate at 3 and 7 WAP as well as a single application at 5 WAP always resulted in seed yield equal to a weed free herbicide program. Yields from the 3 WAP treatment was lower than weed free in three of four environments. Seeding rate did not influence the optimum timing for a spray application for any of the factors measured, indicating that glyphosate herbicide programs do not need to be adjusted when seeding rate is reduced.