农业迅速发展,土壤肥力却严重退化,工业污染、农药化肥过量使用,土壤长期缺少营养元素等因素以致土壤越来越薄。年初,一篇博导写的调查报告引起轩然大波,报告中显示,农民使用的化肥农药一般是一亩地三四百斤化肥,两三斤农药,这些化学物质,能够被利用到庄稼或保护庄稼的只有占10%~30%,也就是说大量化学物质是用来污染的,污染的比例高达70%~90%。农资的滥用和不合理使用让土壤变得千疮百孔。而我国从南方到北方,从 The rapid development of agriculture, soil fertility has seriously deteriorated, industrial pollution, excessive use of pesticides and fertilizers, the lack of long-term soil nutrients and other factors that make the soil thinner and thinner. In the beginning of this year, an investigation report written by Bo wrote that it caused an uproar. The report shows that the pesticide used by peasants is generally three to four kilograms of chemical fertilizer per mu and two or three kilograms of pesticides. These chemicals can be used for crops or for the protection of crops Only 10% to 30%, which means that a large number of chemical substances are used to contaminate the pollution as high as 70% to 90%. The abuse of agricultural resources and irrational use make the soil become riddled with problems. Our country from the south to the north, from