Abstract: 【Objective】 To screen the herbicides with good control effect on weeds in Xinjiang barley field, and to evaluate the safety of the selected chemicals to barley, so as to provide a scientific basis for the safe and efficient application of herbicides.【Method】Randomised-block design was used to research the number and the fresh weight of weeds at fixed spots, and the effect of herbicides on weeds and safety to barley was evaluated.【Result】The experiment selected Pinoxaden 5% EC and Halauxifen-methyl 10%+Florasulam 10% WG to test the safety. Weed control effect on fresh weight of two mixed herbicides in barley fields were all above 90%, which achieved better control effect.【Conclusion】Using mixed WG to control Setaria viridis (L.) Beauv, Echinochloa crusgalli (L.) Beauv, Chenopodium glaucum L. and Fallopia convolvulus (L.) Love in the mixed plots in the main barley producing areas in Qitai, Xinjiang would be effective. The dosage is Pinoxaden 5% EC 45-60 g a.i./hm² and Halauxifen-methyl 10%+Florasulam 10% WG 12-15 g a.i./hm².

Key words: barley; weed; herbicide

摘要： 【目的】筛选对新疆啤酒大麦田杂草具有较好防除效果的除草剂，评价选用药剂对大麦的安全性，为安全、高效应用除草剂提供科学依据。【方法】采用随机区组的试验方法，定点取样调查各处理小区的杂草株数、鲜重，评价供试药剂处理对杂草的防除效果及对大麦的安全性。【结果】选取的5%唑啉草酯乳油、20%双氟·氟氯酯水分散粒剂测定对大麦生长安全，两种药剂混用处理对大麦田杂草的鲜重防效均在90%以上，达到较好的防除效果。【结论】奇台等新疆大麦主产区大麦田狗尾草、稗草及灰绿藜、卷茎蓼等杂草混合发生的田块，选用水分散粒剂混用，用量为5%唑啉草酯乳油45~60 g a.i./hm²加20%双氟氟氯酯水分散粒剂12~15 g a.i./hm²，采用二次稀释的方法，在大麦拔节前进行田间喷雾防治，可有效防除大麦田杂草。

关键词: 大麦, 杂草, 除草剂