一、当前国外除草剂使用情况田间杂草对作物产量威胁极大。任何一种作物,从播种到收获,均以除草所费劳力最多。1941年后,除草剂的出现可以说是杂草防除技术上的一次革命。但除草剂的使用却从五十年代才开始,到了六十年代,化学除草随着农业机械化和化学化的进展而有了飞跃发展。用除草剂防除田间杂草,不但成本低于机械除草,而且可以节省大量劳力。目前,在 First, the current use of foreign herbicides Field weeds on the crop yield a great threat. Any kind of crop, from sowing to harvesting, has the most labor to weed out. After 1941, the emergence of herbicides can be said that a weed control technology revolution. However, the use of herbicides began in the 1950s. By the 1960s, chemical weeding had leaped forward with advances in agricultural mechanization and chemistry. With herbicides to control field weeds, not only less costly than mechanical weeding, but also can save a lot of labor. Now I am at