杂草对作物生长为害很大,它的地下部可以夺取土壤中的水份养料,地上部荫蔽作物,而且有些杂草又是病虫害蔓延的源泉,因此杂草影响作物产量降低、品质变劣、成本增高,给农业生产带来很大损失。草害是目前甘蔗生产中的一个严重问题,它使甘蔗萌芽率下降,蔗株矮小,瘦弱萎黄,分蘖锐减,最后导致严重减产,减产率达10～52.9％。在正常年份,每亩蔗田需用除草人工 Weeds are very damaging to crop growth. The underground part of the weeds can seize the moisture nourishment in the soil and the shade crops in the ground, and some weeds are the source of pest and disease spread. Therefore, the weeds affect the yield and quality of the crop, Higher costs have brought great losses to agricultural production. Grass damage is currently a serious problem in sugar cane production. It reduces the rate of germination of sugarcane, short stature, thin and yellowish, sharp decline of tiller, and finally leads to serious yield reduction with the yield reduction of 10-52.9%. In normal years, we need artificial weeding for every mu of cane fields