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(一) 近二十年来国内外化学农药生产、使用和科学研究的发展极为迅速。产量大幅度增长,目前世界上化学农药年产量已达170万吨以上,品种已增到1000种以上,常用的也有300—500种。使用化学农药防治农作物病虫害、粮仓虫鼠、农田杂草和促进生长发育等,都已成为当前农业生产上很重要的增产措施,效果十分显著。例如,日本在稻田中
(I) The development of the production, use and scientific research of chemical pesticides at home and abroad in the past 20 years has been extremely rapid. The output of chemical pesticides has increased by a large margin. At present, the annual output of chemical pesticides in the world has reached over 1.7 million tons and the varieties have been increased to more than 1,000 species with 300-500 species commonly used. The use of chemical pesticides to prevent crop pests and diseases, silos worms, farmland weeds and promote growth and development, have become the current agricultural production is very important measures to increase production, the effect is very significant. For example, Japan is in rice fields