Adjuvants increase postemergence herbicide efficacy, but adjuvant type greatly affects herbicide efficacy enhancement by the adjuvant.
助剂对除草剂有增效作用，但不同类型助剂对除草剂增效作用差别很大。
Compounds were sprayed immediately after seed planting (preemergence treatment) or after the expansion of the first true leaf (postemergence treatment).
