乙草胺是在作物播种后、杂草出土前施用的选择性芽前除草剂。它以广谱高效、使用方便、价格低而深受农民欢迎。但它除草面相对较窄,药效期短,作物后期如不加强管理,杂草就会迅速生长,甚至泛滥成灾,尤其是双子叶阔叶杂草,为害更大,严重影响庄稼正常生长和管理,甚至造成减产。 最近两三年,迁安、滦县部分地区农民,经过实验,大胆改革,根据乙草胺药效期短、除草面窄、作物生长后期容易长杂草的缺点,针对乙草胺芽前除草的特点,将播后苗前喷施改为苗后锄一遍地时喷施,这样就顺延了时间使作物生长后期不生或少生杂草,免除了作 Acetochlor is a selective preemergent herbicide applied before the weed is excavated after sowing the crop. It is broad-spectrum efficient, easy to use, low prices and welcomed by farmers. However, its weeding surface is relatively narrow, and its effective period is short. If we do not strengthen the management in the later stage of the crop, the weeds will grow rapidly and even flood, especially the dicotyledonous broad-leaved weeds, causing more serious damage and seriously affecting the normal growth of crops And management, and even cut production. In the recent two or three years, peasants in Qian’an and Luanxian areas have experienced experiments and bold reforms. According to the shortages of short duration of herbicide, narrow weed width and easy growth of weeds in late crop growth stage, The characteristics of the sowing before spraying after the seedling hoe to spray again and again, so postponed the late crop growth period less or less weeds, eliminating the need for