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杂草与农作物争水肥、争光照、争空间,传播多种病虫害,严重影响农业生产安全。随着种植结构的调整和生产水平的提高,农田杂草的发生危害呈加重趋势,据调查,一般田块因杂草减产5%～30%,严重田块减产50%以上。随着农村土地规模经营和劳动力资源紧张,农民迫切需要化学除草取代繁重的人工除草,对除草剂的需求量迅猛增加,化学除草已成为保障农业生产安全的一项重要措施。除草剂的防治对象是与作物很相近的杂草,它不同于杀虫剂和杀菌剂,在生产中对施用技术要求较高。任何作物都不能完全抗除草剂的药害,只能忍耐一定剂量的除草剂,也就是说除草剂对作物与
Weeds and crops fight water fertilizer, fight light, fight space, spread a variety of pests and diseases, seriously affecting the safety of agricultural production. With the adjustment of planting structure and the improvement of production level, the occurrence and harm of weeds in farmland are on the increase. According to the survey, the production of weeds is reduced by 5% -30% in general and by more than 50% in severe fields. With the scale management of rural land and the shortage of labor resources, farmers are in urgent need of chemical weeding instead of heavy manual weeding, the demand for herbicides is rapidly increasing, and chemical weeding has become an important measure to ensure the safety of agricultural production. Herbicide control object is similar to crops and weeds, it is different from pesticides and fungicides, in the production of high technical requirements for the application. Any crop can not be completely resistant to herbicides, can only tolerate a certain dose of herbicides, that is, herbicides on crops and