Fertilizer use in China has been a few decades of history, whether it is food crops or fruits and vegetables, fertilizer for the role of income can be said to be contributed. However, the application of chemical fertilizers is really “the most good”? The latest data show that the Taihu Lake region in Jiangsu Province, non-point source pollution situation: rice and wheat rotation mode, the annual fertilizer in the rice season through the runoff and leaching loss of 15 %, Ammonia volatilization reached 18%; facilities vegetable fertilizer runoff and leaching loss of 22%, peach garden fertilizer runoff and leaching loss in 19%, mainly concentrated in the annual April to July. These plants did not use the fertilizer so discharged into the natural water, causing a serious eutrophication of Taihu Lake.

              In this regard, the “4R system” to control the status quo of pollution: Reduce (reduction): the source of fertilizer control, and according to the specific needs of the crop scientific and reasonable fertilization; Retention (intercept): the construction of emission reduction control facilities Reuse (Reuse): the construction of biological floating bed, tibby dam and other facilities to consume the remaining nutrients in the water; Restore (repair): The pollution of the water entering the river channel shall be strictly monitored, and the waste water that is not up to standard can not be discharged, so that the polluted ecology has been restored. Through the application of these technologies, we not only effectively curb the Taihu Lake area of ​​non-point source pollution, but also reduce the cost of agriculture.