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农药与化肥的大量使用已严重威胁到人类的健康.据统计,每年全世界农药的用量高达23亿公斤,每年死于农药中毒的人数在50万人以上.近年来,随着化肥工业的发展及用量的不断增加,无机肥料对环境的污染日益严重.一般情况下,无机肥料施入土壤之后,氮的利用率为20-50%,磷为10-20%,钾为40%左右,剩余部分,被淋溶到江河湖泊中,残留于土壤或通过化学反应进入大气而造成污染.所以,全人类都在关注这一问题.
The heavy use of pesticides and fertilizers has seriously threatened human health.According to statistics, the annual amount of pesticides in the world is as high as 2.3 billion kilograms, with more than 500,000 people dying each year from pesticide poisoning.In recent years, with the development of fertilizer industry And the increasing use of inorganic fertilizers on the environment more and more pollution.In general, inorganic fertilizers applied to the soil, the nitrogen utilization rate of 20-50%, phosphorus is 10-20%, potassium is about 40%, the remaining Part of it is leached into rivers and lakes, left in the soil or chemically contaminated into the atmosphere, so all mankind is paying attention to this problem.