The development of glufosinate-resistant soybean cultivars has created opportunities for use of glufosinate applied postemergence for weed control. Four field experiments were conducted in 2021 and 2022 to ascertain the effect of glufosinate rate and the addition of ammonium sulfate on annual weed control in glyphosate/glufosinate/2,4-D-resistant soybean. An increased glufosinate rate of 500 from 300 g ai ha(-1) improved control of common ragweed, common lambsquarters, redroot pigweed, and foxtail species and resulted in decreased density and dry biomass of common lambsquarters and foxtail species. The addition of ammonium sulfate to glufosinate increased control of common lambsquarters, 2 and 8 wk after application (WAA), and of foxtail species, 2, 4, and 8 WAA, but did not improve control of common ragweed and redroot pigweed. Increasing the dose of glufosinate from 300 to 500 g ai ha(-1) improves control of common ragweed, redroot pigweed, common lambsquarters, and foxtail species; however, the benefit of the addition of ammonium sulfate to glufosinate is weed species-specific.
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机译：抗草铵膦大豆品种的开发为在出苗后使用草铵膦控制杂草创造了机会。2021年和2022年分别进行了4次田间试验，以确定草甘膦/草铵膦/抗2,4-D大豆草铵膦添加率和硫酸铵铵添加对年杂草防治的影响。从300 g ai ha（-1）增加500草铵膦速率，改善了对普通豚草、普通羊螨、红根猪草和狐尾草物种的控制，并导致普通羊螨和狐尾物种的密度和干燥生物量降低。在草铵膦中添加硫铵膦可提高对普通羊羔（施用后 2 周和 8 周 （WAA））和狐尾物种 2、4 和 8 WAA 的控制，但并未改善对普通豚草和红根猪草的控制。将草铵膦的剂量从300 g ai ha（-1）增加到500 g ai ha（-1）可改善对普通豚草、红根猪草、普通羊羔和狐尾草的控制;然而，在草铵膦中添加硫酸铵的好处是杂草物种特异性的。
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