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A Study on the Characteristics of Nitrogen and Phosphorus Runoff from Farmland under Wheat-Rice Rotation in Nansi Lake Basin

Field runoff pools were used to collect the surface runoff samples of wheat-rice rotation in Nansi Lake region, and different forms of nitrogen (N) and phosphorus (P) data were analyzed. The average runoff concentrations, losses, and characteristic ratios of N and P were studied. The average runoff concentrations of TN and TP in wheat–rice rotation were 0.87–7.94 and 0.08–0.81, respectively. The characteristic ratios of N and P were also observed. And the characteristic ratios of NO3--N, NH4+-N, DP, and PO43--P were 45.03%, 17.55%, 71.43%, and 54.01% in wheat–rice rotation, respectively.