Experimental Research on Fertilizer Requirement of Spring Maize under Drip Irrigation in Ningxia Irrigation Area

The3414fertilizer effect experiment method was carried out with 16 treatments under different application rates of nitrogen,phosphorus and potash fertilizer,in order to determine the fertilizer requirement and fertilizing scheduling of spring maize under mulched drip irrigation in Ningxia Yellow River Irrigation Area.The results showed that,through analyzing the quadratic regression model between fertilizer application andcorresponding yield,the optimum fertilizer application rates of N,P_2O_5 and K_2O were 255,90,37.5kg/hm~2,respectively,and the yield was 12 929kg/hm~2.The agronomic efficiencies of N,P_2O_5 and K_2O were 19%,58%,88%,respectively,and the agronomic efficiency of potash fertilizer was the highest,which showed that applying the right amount potash fertilizer was beneficial to increasing yield of wheat,and the treatment with fertilizer application rates of N,P_2O_5 and K_2O of 255,90,37.5kg/hm~2,respectively,was the optimal treatment with both highest yield and agronomic efficiency of fertilizers.