Nitrogen and Phosphorus Loss Law and Emission Reduction Effects Under Water and Fertilizer Management Integrated Mode in Dike Paddy Field

To achieve the purpose of reducing farm non-point source pollution,we integrated site specifi c nitrogen management,precise irrigation,controlled drainage,and wetland eco-repair system in dike area of Taihu basin.During investigation,it had given prominence for the water and fertilizer coupling effects of precise irrigation and site specifi c nutrient management,the characteristics of integration on controlled irrigation,controlled drainage and wetland ecosystem non-point source pollution control.Then the water and fertilizer integrated management mode of paddy field was put forward in Taihu basin where the water production efficiency increased to 1.64 kg·m-3,water saved 37.8%,fertilizer use efficiency raised 15.4%,yield raised 10%,and N,P load decreased 26%-72%.The modern agricultural and farmland ecosystems that control and cut down the farm non-point source pollution came into being,which can be a reference by Taihu basin to control its agricultural non-point source pollution and eutrophicated water body.