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农药是广泛用于农业生产防治病虫草害和调节植物生长的化合物。它是人类同农业病虫草害做斗争,确保农业丰收不可缺少的物质基础,是现代农业重要生产资料。据统计,全世界每年由于病虫草害对农作物所造成的损失约有1000亿美元,损失率是总收成的30—50%,由于使用化学农药,全世界每年挽回的粮食占总产量的15%左右。以1979年世界粮食总产量计算,一年可挽回3～3.5亿吨粮食,如果按每人每年250公斤口粮计算,这些粮食可以养活12—14亿人。在我国由于使用化学农药,挽回粮食损失占总产量的7%
Pesticides are compounds that are widely used in agricultural production to control pests and weeds and regulate plant growth. It is the material basis for human beings to fight agricultural pests and weeds to ensure that the agricultural harvest is indispensable, and it is an important production material for modern agriculture. According to statistics, crops caused by pests and weeds cause losses of about 100 billion U.S. dollars each year, and the loss rate is 30-50% of the total harvest. With the use of chemical pesticides, the world’s annual saved food accounts for 15% of the total output. about. Calculated by the total world grain output in 1979, it can restore 300-350 million tons of grain a year. If calculated according to the 250 kilograms per person per year, these grains can feed 12-1.4 billion people. In China, due to the use of chemical pesticides, the recovery of food losses accounted for 7% of the total output.