除草剂使用技术
除草剂使用技术-
导致杂草优势种群演变的原因主要有引种频繁，单一除草剂的长期使用，单一的耕作制度和粗放的栽培措施的影响，除草剂使用技术方面存在的问题和农业综合措施的放松等5方面。
The main reasons for the evolvement of dominant species in weeds community are introduction of seeds frequently , use of unique herbicides long period , simple farming system and extensive culture practices , fallback in using technique of herbicides , and loosen in integrated measures of agriculture .