小麦生长前中期,过去常使用芽前除草剂进行化学除草,效果不错。但也带来了一些严重的问题,这就是土壤中除草剂的残留量越来越多,对后作的不利影响越来越明显,所以近年来小麦田播种时施用芽前除草剂的较少,故生长期部分杂草发生严重,有时即使采用中耕的方法,仍然解决不了草荒问 In the middle and early stages of wheat growth, we used to use chemical herbicides before weeding, which is good. But also brought some serious problems, which is that the residual amount of herbicides in the soil is more and more, and the adverse effects on the after-effects become more and more obvious. Therefore, the application of pre-emergent herbicides in wheat fields in recent years is less , So weeds in the growing part of serious, and sometimes even if the method of cultivation, still can not solve the grass shortage