农药是农业生产中不可或缺的生产资料,它对危害农作物的病虫草害的防治起着举足轻重的作用。同时,农药使用后会残留于农作物、农田及周边环境中,故必须关注其对环境及非标生物的影响。在环境内硝酸的化学合成可由好气土壤中氨经氧化形成。其大致分2个反应,即由氨氧化细菌将氨氧化成亚硝酸,再由亚硝化氧化细菌将亚硝酸氧 Pesticides are indispensable means of production in agricultural production. They play a decisive role in the prevention and control of pests and weeds that endanger crops. At the same time, pesticides will remain in crops, farmland and surrounding environment after they are used, so they must pay attention to their impact on the environment and non-standard organisms. The chemical synthesis of nitric acid in the environment can be formed by the oxidation of ammonia in a good atmosphere. The roughly divided into two reactions, that is, by the ammonia oxidation of ammonia into nitrous acid, and nitrite oxidation of nitrite will be nitrite