雨季是播种苜蓿的好时节,在苜蓿生产中,杂草严重影响苜蓿的产量、质量和建植的成败,杂草与苜蓿对水、养分和光照的竞争引起苜蓿饲草及种子产量的降低,降低饲草的饲用价值,混有杂草的干草在市场上出售时价格较低。因此,杂草防除是苜蓿田间管理的一项至关重要工作。化学防治指使用化学除草剂进行防治杂草。除草剂按喷施部位不同,分为土壤处理除草剂和茎叶处理除草剂。按防除杂草种类不同,分为禾本科杂草除草剂、阔叶杂草除草剂及广谱性除草剂,广谱性除草剂对禾本科杂草、阔叶杂草均有效。一般土壤处理除草剂,大多为广谱性除草剂,主要在整 The raining season is a good time for seeding alfalfa. In alfalfa weeds severely affect the yield and quality of alfalfa and the success of its establishment. The competition of weeds and alfalfa for water, nutrients and light caused the decrease of forage and seed yield of alfalfa, Reducing feed value of fodder, hay mixed with weeds is less expensive to sell on the market. Therefore, weed control is a crucial work in alfalfa field management. Chemical control refers to the use of chemical herbicides for weed control. Herbicide spraying parts by different, divided into soil treatment of herbicides and stems and leaf treatment of herbicides. According to the prevention and control of weed species are divided into grass weeds herbicides, broad-leaved weed herbicides and broad-spectrum herbicides, broad-spectrum herbicides on grass weeds, broad-leaved weeds are effective. General soil treatment herbicides, mostly broad-spectrum herbicides, mainly in the whole