Effects of Natural Rainfall and Application of Slow-release Fertilizers on Nitrogen and Phosphorus Runoff Loss in the Upper Beiyun River Watershed
A field monitoring experiment was conducted to study the effects of non-fertilization(T1),traditional fertilization(T2)and slow-release fertilization(T3)on nitrogen and phosphorus runoff loss during maize growing season in the upper reaches of the Beiyun River watershed.The results showed that when the rainfall exceeded 30 mm in 12 hours,the soil water content was saturated,and the surface runoff was produced,and if the rainfall exceeded 30 mm in 1 hour,the runoff would be intensified.Compared with T2 treatment,T3 treatment had lower TN,TP,ammonium N and nitrate N loss by 15.3％,24.2％,10％and 12％,respectively,but there was no significant difference.The TN loss rate of T3 treatment was 0.07％,which was 46.2％less than that of T2 treatment,the TP loss rate of T3 treatment was 0.13％,which was 71.7％less than that of T2 treatment,and the nitrate N loss rate of T3 treatment was 0.06％,which was 25％less than that of T2 treatment.In conclusion,compared with traditional fertilization,the application of slow-release fertilizer could reduce the loss of nitrogen and phosphorus,which provided data support for scientific promotion of slow-release fertilizer and evaluation of the effect of slow-release fertilizer on the loss of nitrogen and phosphorus.
natural rainfallslow-release fertilizerBeiyun River watershedrunoffnitrogen and phosphorus loss
万方数据
维普
