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Optimal Glyphosate Application Time for Control of Foxtail Barley (Hordeum jubatum)

机译:草甘膦控制大麦的最佳草甘膦施用时间

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Optimal time of application of the isopropylamine salt of glyphosate for long-term control of foxtail barley was studied near Delta Junction, AK in 1992 and 1993. Applications of either 0.6 or 1.1 kg/ha of glyphosate with 2.2 kg/ha of ammonium sulfate and 0.5% (v/v) nonionic surfactant were made to different foxtail barley plots at approximately 2-wk intervals from May to September. Control was rated in July of the year following application. The 0.6 kg/ha rate produced ≤ 60% control on all application dates. At 1.1 kg/ha, foxtail barley control was best from applications made between early August and mid-September. May and mid-June applications provided up to 80% control in 1993 but ≤ 50% control in 1992. For both rates, applications made from late June through July, during foxtail barley flowering and seed fill, consistently provided little control ( < 50%).
机译:在1992年和1993年,在AK三角洲附近研究了草甘膦异丙胺盐长期控制狐尾大麦的最佳时间。施用0.6或1.1 kg / ha草甘膦,2.2 kg / ha硫酸铵和草甘膦的最佳时间。从5月到9月,以大约2周间隔将0.5%(v / v)的非离子表面活性剂制成不同的狐尾大麦图。对照在应用后的当年7月进行了评估。在所有施用日期,0.6 kg / ha的产量控制≤60%。在8月初至9月中旬期间,对狐尾大麦的控制效果最好,为1.1 kg / ha。 1993年5月和6月中旬的施药量控制在80%以下,而1992年则控制在50%以下。从这两个比率来看,从6月下旬至7月,在狐尾大麦开花和种子充实期间,施药量一直很少(<50% )。

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