首先，施用前要了解所用化学除草剂的材性和施用范围困不同化学除草剂对不同作物、不同杂草的作用不同，只有选用适宜的除草剂才能收到理想的效果，否则就会“劳民伤财”。如2，4—D丁酯对除治麦田中的麦蒿、芥菜、发菜等阔叶类杂草效果很好，且对小麦安全；但有的农户把2，4— First of all, before using the chemical herbicide to understand the material properties and the scope of application of sleepy different chemical herbicides on different crops, different weed different roles, only by selecting the appropriate herbicide to receive the desired effect, otherwise it will “ ”. Such as 2,4-D-butyl wheat in the removal of the lawn, mustard, hairy weeds and other broadleaf weed good effect, and the safety of wheat; but some farmers to 2,4-