The yield and quality of alfalfa and weed control effects were investigated by the method of single factor complete randomized block design.Result showed that 2,4-DB and bentazon applied alone or mixture had a better control effect on broadleaf weeds,and control efficiency was 75.80％ ～90.65 ％.Haloxyfop-R-Methyl,quizalofop-R-methyl and clethodim had effective control on monocotyledon weeds in alfalfa field,and control efficiency were more than 71.10％.However,2,4-DB decreased the cumulative yield of alfalfa more than 64％.While bentazon + Haloxyfop-R-Methyl,bentazon +Quizalofop-R-methyl and Haloxyfop-R-Methyl improved the yield of alfalfa harvested secondly up to 46.50％,45.28％ and 43.06 ％,receptively.With the comprehensive consideration of herbicide performance,bentazon+Haloxy-fop-R-Methyl and bentazon+Quiza lofop-R-methyl showed better results and could be widely applied in alfalfa fields.%紫花苜蓿(Medicago sativa L.)苗期杂草危害严重,显著影响建植,为此采用单因素完全随机区组设计的方法,探究7种除草处理对苜蓿产量、品质和杂草防除效果的影响.结果表明:2,4-DB、苯达松及其混用组合处理可有效防除阔叶类杂草,株防效在75.80％～90.65％之间；高效盖草能、精喹禾灵、烯草酮可有效防除单子叶杂草,株防效高于71.10％.喷施2,4-DB会使苜蓿的总产量减少64％以上；喷施苯达松十高效盖草能、苯达松十精喹禾灵、高效盖草均能显著地提高第2茬的产量,苜蓿总产量分别提高45.60％,45.28％和43.06％.综合考虑除草剂的安全性和除杂增产效果等方面,以苯达松十高效盖草能和苯达松十精喹禾灵2种除草处理的效果较好,可在苜蓿生产田推广利用.
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