Effects of Nitrogen and Phosphorus Application and Fertilization Methods on Maize Growth

Field experiment was carried out to study the effect of N and P supply levels and application methods on maize physiological determinants,N and P use efficiency,urease activity and phosphatase activity at rhizosphere.The results showed that root and shoot biomass under N and P fertilizer was significantly higher than those of no-fer-tilizer treatment.Under different application methods,the treatments where fertilizer positioned 6cm side to seed row and 6cm below the soil surface had significantly higher,shoot and root biomass than no-fertilizer treatment and de-creased 40% fertilizer supply treatment.In general,under high soil fertility,decrease 20%-40% fertilizer supply level could not be significantly lower maize yield,and fertilizer application methods had no effects on maize yield.