Effect of Controlled Release Fertilizer on Nitrogen and Phosphorus Runoff Losses from Farmland in Slope Field

Experiment was conducted in rainy season between May and September 2010.The laws and characteristics of ammonium nitrogen,nitrate nitrogen,particulate nitrogen and phosphorus,total nitrogen and phosphorus difference of two fertilizers were analyzed under different slopes of peanut growing season.The results showed that compared with common fertilizer,in the early reproductive stages,the nutrient loss content of controlled-release fertilizer was lower,ammonium nitrogen content was 5.0%~74.2% lower and nitrate content of 3.9%~37.0%,soluble phosphorus content was 7.1%~94.1%.In the later growth period,particulate nitrogen and phosphorus content of CRF increased in varying degrees.But in the entire monitoring period,the total nitrogen and phosphorus content of CRF treatment were lower than CCF.In addition,in different slopes,as the slope increases,the change of nutrient content of common fertilizer and controlled-release fertilizer was 15°10°5°0°.This indicates that,under conditions of the sloping land controlled-release fertilizer could maintain high nutrient content and conducive to nitrogen and phosphorus absorption,reduce the nutrient loss and reduce negative effects of nonpoint source pollution on the agricultural environment in whole growth of peanut.