Preplant applications of two 2,4-D formulations and dicamba were evaluated for injury to no-till soybean. Herbicides applied 28 or 21 d before planting (DBP) at 0.56 kg ae/ha for the 2,4-D formulations and 0.28 kg ae/ha for dicamba did not injure soybean. At 14 DBP soyabean injury was lower (<6) with applications of 2,4-D than with dicamba (13 to 17). Injury increased when herbicides were applied at 7 DBP with soyabean injury from both 2,4-D (<11) and dicamba (<38). When the herbicides were applied at planting soyabean injury was <18 with the 2,4-D formulations and <73 with dicamba. Soyabean yields were unaffected by the injury from herbicides applied 21, 14, and 7 DBP. However, soyabean yield was decreased to 870 kg/ha in 2005 when dicamba was applied at planting compared to the nontreated check (1,950 kg/ha).
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机译：评估了两种2,4-D配方和麦草畏的种植前施用对免耕大豆的伤害。在播种前28或21 d施用除草剂（DBP），2,4-D配方施用0.56 kg ae/ha，麦草畏施用0.28 kg ae/ha，对大豆无害。在14 DBP时，施用2,4-D的大豆损伤率（<6%）低于麦草畏（13%至17%）。当以7 DBP施用除草剂时，2,4-D（<11%）和麦草畏（<38%）对大豆的伤害增加。当在种植时施用除草剂时，2,4-D制剂对大豆的伤害率为<18%，麦草畏的伤害率为<73%。大豆产量不受施用除草剂 21、14 和 7 DBP 的伤害的影响。然而，2005年，在播种时施用麦草畏时，大豆产量下降到870公斤/公顷，而未经处理的检查（1,950公斤/公顷）。
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