应用化学药剂除草,是现代化农业生产的一项技术措施。农田化学除草的发展历史不长,四十年代初期开始使用2.4—D 类化合物,防治禾本科作物中的大部双叶杂草。现在已经有适用于不同农田、蔬莱、果木的很多品类的除草剂。到1983年初,世界除草剂的总产量,按有效成份计算,每年为70—80万吨,占化学农药总产量的40—50%,已经商品化的品种有 The application of chemical weeding is a technical measure of modern agricultural production. Farmland chemical herbicides have not been developed for a long time. In the early 1940s, 2.4-D compounds were used to control most two-leaf weeds in gramineous crops. There are already many classes of herbicides available for different farmlands, vegetables and fruits. By the beginning of 1983, the total output of herbicides in the world, calculated on the basis of active ingredients, amounts to 700,000 to 800,000 tons per year, accounting for 40 to 50% of the total output of chemical pesticides. The commercialized varieties