Impact of Injury from Late Season Sequential Glufosinate Applications on Sugarbeet Yield

Ines Rothe, A. Dexter, J. Luecke
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Abstract

Experiments were conducted to determine if sugarbeet (Beta vulgaris L.) injury from sequential glufosinate treat" ments starting later than three weeks after the sugarbeet cotyledon stage caused yield loss, and to assess cumulative phytotoxic effects from sequential glufosinate treatments at various rates. Sugarbeet plots were hand weeded until gIufosinate treatments started so that sugarbeet yield loss with late season glufosinate treatments, if any, could be attributed to herbicide injury rather than prolonged early season weed competition. Visible sugarbeet injury was greater when glufosinate treatments were started at three, four, six, or seven weeks after the sugarbeet cotyledon stage rather than one week after the cotyledon stage. The absence of a difference in sugarbeet root yield and extractable sucrose, regardless of glufosinate application starting time, suggests that sugarbeet either partially grew out of the observed leaf chlorosis or that late-appearing visible injury had no adverse effect on yield traits. Regardless of the rate, sugarbeet treated with glufosinate either one or four times had similar root yield and extractable sucrose, which confirms the lack of any signif­ icant cumulative phytotoxic effect on sugarbeet yield from multiple glufosinate applications. Additional Key Words: Beta vulgaris L., weed competition, leaf chlorosis.
末季连续施用草铵膦对甜菜产量的影响
试验旨在确定甜菜(Beta vulgaris L.)在子叶期3周后开始的连续草铵膦处理是否会造成产量损失,并评估不同剂量连续草铵膦处理的累积植物毒性效应。在草铵膦处理开始之前,甜菜田都是手工除草,因此,如果有的话,末季草铵膦处理造成的甜菜产量损失可能是除草剂伤害,而不是长时间的初季杂草竞争。草甘膦在甜菜子叶期后3周、4周、6周或7周施用比在子叶期后1周施用时,可见甜菜损伤更大。无论开始施用草铵膦的时间如何,甜菜根产量和可提取蔗糖没有差异,这表明甜菜要么部分地摆脱了所观察到的叶片褪绿,要么是后期出现的明显伤害对产量性状没有不利影响。无论速率如何,用草铵膦处理1次或4次的甜菜根产量和可提取蔗糖量相似,这证实了多次施用草铵膦对甜菜产量没有任何显著的累积植物毒性影响。关键词:甜菜,杂草竞争,叶片褪绿。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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