Field runoff plots experiments were performed to monitor runoff

sediment yield and nitrogen loss in slope cropland of purple soil.Results showed that

Fertilization could reduce runoff and sediment yield of slope cropland.Application of manure with chemical fertilizer could reduce 68.2%

67.3% of runoff and sediment yield.Straw returned with chemical fertilizer could reduce 80.3%

92.6%.Particle nitrogen transport following runoff is the main pathway in slope cropland of purple soil because yield of particle nitrogen was above of 60.0% of total nitrogen.Balanced fertilization can reduce the nitrogen loss significantly through runoff in slope cropland.Application of N with P and K fertilizer could reduce 41.0% and 46.1% of total N compared with single N fertilizer application.Single chemical fertilizer could reduce 36.5% of total nitrogen.And manure with chemical fertilizer could reduce 69.0% of total nitrogen.Straw returned with chemical fertilizer could reduce 90.5% of total nitrogen.So that rational fertilization system could reduce the nitrogen loss from slope cropland.And straw returning has the best effect.