国家有关部门对全国5大污染严重的水系持续监测的结果显示,农业面源污染所占的比重正呈上升之势,解决农业面源污染,保护有限的水土资源已迫在眉睫。以太湖流域为例,这里每公顷耕地施撒化肥达667kg(折纯养分,下同),是发达国家规定的“每公顷耕地施撒化肥不得超过225kg”的近3倍 The results of the state departments concerned on the continuous monitoring of the five major polluted water systems in the country show that the proportion of agricultural non-point source pollution is on the rise. It is imminent to solve the problem of agricultural non-point source pollution and to protect limited water and soil resources. Take the Taihu Lake Basin as an example. Here, 667kg of fertilizer is applied per hectare of cultivated land (folded nutrients, the same below), which is nearly three times as high as that of 225kg per hectare of cultivated land stipulated by developed countries