The paper researches about the safety in the pesticide employment of the weeding before it’s germination. Using 48% butralin do a experiment in the lawn of white clover, kentuky bluegrass and tall fescue. It shows that butralin is an fine weedicide. The different butralin density has different influence on different type of lawn. 500 double 48% butralin solution is economic and benefit. High density 48% butralin obvious effect repression to grass germination, but has no influence on the white clover.
