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