农田污染物的来源较多,归纳起来大致有:乡镇工业的“三废”(废气、废水、废渣),农田化肥的使用以及农药的污染。其中以工厂中的废水、化肥和农药的使用,对农业生产的影响最为严重,废水污染尤为突出。据有关部门的统计资料(1982年)表明,上海郊区乡镇工业废水排污量为14259万吨;化学农药的使用量为13544吨,郊县每亩耕地平均用药量为1.75～3.58公斤;化肥使用量逐年增加,1950 More sources of farmland pollutants, summed up broadly: township industrial “three wastes” (emissions, waste water, waste residue), the use of farmland fertilizer and pesticide pollution. Among them, the use of wastewater, fertilizers and pesticides in the factories has the most serious impact on agricultural production and the wastewater pollution is particularly prominent. According to the statistical data of relevant departments (1982), it is indicated that the discharge volume of industrial wastewater in towns and villages in Shanghai suburbs is 142.59 million tons; that of chemical pesticides is 13544 tons; and that of suburban counties is 1.75-3.58 kg; Increasing year by year, 1950