目的:探讨除草剂对肇东苜蓿耐药性的影响,筛选出对苜蓿无药害的除草剂品种和使用方法。方法:通过小区试验,在苜蓿分枝期,对各除草剂处理苗情和草情进行观察记录。结果:对苜蓿无药害的药剂处理有75%阔叶散播后苗前喷雾、5%金普施特苗后2～4叶期喷雾、4%金豆苗后2～4叶期喷雾、10%利收苗后2～4叶期喷雾。结论:苜蓿无药害的除草剂品种和使用方法,推荐5%金普施特播后苗前和苗后2～4叶期喷雾。 Objective: To investigate the effects of herbicides on the resistance of alfalfa in Zhaodong, and to screen out herbicide-free varieties for alfalfa and their application methods. Methods: Through plot experiments, we observed and observed the seedling and grass of each herbicide during the alfalfa branching period. Results: Medicago sativa had no spray injury after 75% broadleaved spray, 2 ~ 4 leaf spray after 5% Kim SST, 2 ~ 4 leaf spray after 4% Benefit after harvest 2 to 4 leaf stage spray. Conclusion: Medicago sativa herbicide-free varieties and methods of use, recommended 5% Kim SST sowing after pre-emergence and post-2 to 4 leaf stage spray.