Abstract: 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+Haloxyfop-R-Methyl and bentazon+Quiza lofop-R-methyl showed better results and could be widely applied in alfalfa fields.

Key words: Alfalfa, Effects of weed control, Cumulative yield, Quality

摘要： 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+高效盖草能、苯达松+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+高效盖草能和苯达松+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。

关键词: 紫花苜蓿, 杂草防除效果, 总产量, 品质