A field experiment with building runoff ponds on the typical vegetable lands in Tai lake basin was conducted to study the characteristics the loss of nitrogen and phosphorus with surface runoff.The results showed that the mean annual discharge of nitrogen and phosphorus was different greatly,total nitrogen(TN) was 45.76 kg/hm2 to 60.45 kg/hm2,and total phosphorus(TP) was 2.67 kg/hm2 to 3.95 kg/hm2.Comparing with the conventional fertilization,optimum fertilization could reduce the discharge of nitrogen and ...