Field studies were conducted in 2017 and 2018 in Arkansas to evaluate the injury caused by herbicides on soybean canopy formation and yield. Fomesafen, acifluorfen, S-metolachlor + fomesafen, and S-metolachlor + fomesafen + chlorimuron alone and in combination with glufosinate were applied to glufosinate-resistant soybean at the V2 growth stage. Soybean injury resulting from these labeled herbicide treatments ranged from 9% to 25% at 2 wk after application. This level of injury resulted in a 4-, 5-, 6-, and 6-d delay in soybean reaching 80% groundcover following fomesafen, acifluorfen, S-metolachlor + fomesafen, and S-metolachlor + fomesafen + chlorimuron, respectively. There was a 2-d delay in soybean reaching a canopy volume of 15,000 cm3 following each of the four herbicide treatments. The addition of glufosinate to the herbicide applications resulted in longer delays in canopy formation with every herbicide treatment except glufosinate + fomesafen. Fomesafen, acifluorfen, S-metolachlor + fomesafen, and S-metolachlor + fomesafen + chlorimuron, each applied with glufosinate, delayed soybean from reaching 80% groundcover by 2, 7, 8, and 9 d, respectively, and delayed the number of days for soybean to reach a canopy volume of 15,000 cm3 by 2, 3, 2, and 2 d, respectively. No yield loss occurred with any herbicide application. A delay in percent groundcover in soybean allows sunlight to reach the soil surface for longer periods throughout the growing season, possibly promoting late-season weed germination and the need for an additional POST herbicide application.

中文翻译：

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芽后除草剂对大豆损伤和冠层形成的影响

2017 年和 2018 年在阿肯色州进行了实地研究，以评估除草剂对大豆冠层形成和产量造成的伤害。氟虫草醚、三氟醚菊酯、S-异丙甲草胺 + fomesafen，和S-将异丙甲草胺+氟虫草胺+氯嘧磺隆单独和与草铵膦联合应用于V2生长期的抗草铵膦大豆。在施用后 2 周，这些标记的除草剂处理造成的大豆损伤范围为 9% 至 25%。这种程度的伤害导致大豆在使用氟磺胺草醚、三氟羧草醚后延迟 4、5、6 和 6 天达到 80%S-异丙甲草胺 + fomesafen，和S-异丙甲草胺 + fomesafen + 氯嘧磺隆，分别。大豆达到 15,000 厘米的冠层体积存在 2 天延迟3在四种除草剂处理中的每一种之后。在除草剂应用中添加草铵膦会导致除草铵膦 + 氟虫胺之外的所有除草剂处理的冠层形成延迟更长。氟虫草醚、三氟醚菊酯、S-异丙甲草胺 + fomesafen，和S-异丙甲草胺+氟虫草胺+氯嘧磺隆，每施草铵膦，使大豆达到80%地被覆盖的时间分别延迟2、7、8和9天，使大豆达到15000 cm冠层体积的天数延迟3分别为 2、3、2 和 2 天。使用任何除草剂均未发生产量损失。大豆中地被覆盖率的延迟允许阳光在整个生长季节更长时间地到达土壤表面，可能促进晚季杂草发芽和需要额外的后期除草剂应用。