农业生产上的一项最重要的栽培管理措施是防除杂草,采用化学药剂已经是进行农业生产现代化的主要除草手段。我国农田化学除草虽然有二十多年的发展历史,1971年以后才迅速扩大。1974年全国农田化学除草面积为2500万亩,到1984年已达到1亿亩。从最近几年我国农田化学除草面积的迅速扩大,说明了过去认为农田化学除草只能在地广人稀的地区才需要发展的看法是不正确的。随着工副 One of the most important cultivation and management measures in agricultural production is to control weeds. The use of chemical agents has been the main weeding method for the modernization of agricultural production. Although the chemical weed control on farmland in our country has a history of more than 20 years, it expanded rapidly after 1971. In 1974, the area of ​​chemical weed control in farmland was 25 million mu, reaching to 1 billion mu in 1984. The rapid expansion of chemical weed-holding areas in our country in recent years shows that it is not correct to think that chemical weed-farming in the past only needed to be developed in sparsely populated areas. With the workers deputy