片语
preemergence tillage出苗前耕作
preemergence herbicide苗前处理除草剂
preemergence herbicide screening芽前除草剂
preemergence application出土前施用
preemergence herbicides出土前除草剂
preemergence treatment苗前处理
preemergence spray出苗前喷药
preemergence control未出苗前除草
preemergence management苗前养护