The crucial factor of non-point pollution(N, P) controlling in Weihe River basin—Study and evaluation of Slow-Release compound Fertilizer

Through the analysis of major pollution source in Weihe River basin, we found that agricultural non-point pollution(N, P) is the main source of water pollution, and a large number of application of chemical fertilizers and the low utilization rate is the main cause of this pollution. Therefore, reducing application of agricultural fertilizers, increasing their utilization and decreasing the basin of N, P emission are the crucial factors of pollution controlling. From the views above, we analyzed the significance of Slow-Release compound Fertilizer application in relation to reducing non-point pollution emission, and also mainly studied the preparation mechanism and application development of slow-release materials.