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Crop yield and fertilizers application were investigated in high-yield rice-wheat rotation areas in south Hebei, China in August 2010. Soil in topsoil, surface-water in paddy field and drainage samples were collected, and available nitrogen and phosphorus in soil and total nitrogen and phosphorus in water were analyzed. The results show that most fertilizers applied in field are chemical, not many compost manure. The more chemical fertilizers and manure are applied, the more nitrogen and phosphorus are lost. The nitrogen and phosphorus between surface-water of paddy soils and drainage are relative obviously, and their coefficients are 0.8456 and 0.8677 respectively. By application of excessive fertilizers, pollution risk to water is higher in high-yield rice-wheat rotation areas. However, there is lower N P loss in test I and II. Rational fertilizations can decrease the environmental risk of N, P from rice-wheat rotation soils

Effect of different fertilizations on the N, P loss in rice-wheat rotation soil in south Hebei, China