Effect of Nitrogen Application Models on the Dynamic of Nutrient Absorption of Spring Maize

By the test in spring maize field and laboratory analysis,the dynamic behavior of nutrient absorption of spring maize and the fertilizer N use efficiency were studied as affected by models of nitrogen application.The results showed that nitrogen application enhanced N,P and K contents of maize plant,and improved the maize yield charac-ter.With growth stages,the N and K contents of each organ of maize plant decreased,and P content changed with no rule.Compared with other models of nitrogen application,two topdressings and one deep application both showed greater preponderance,whose output-input ratio,N agronomic efficiency and fertilizer N use efficiency were 7.78,29.05 kg/kg and 40.13% and 6.93,24.38 kg/kg and 39.92%,respectively.Considered fertilizer requirement charac-teristics of maize and fertilizer properties,it was filtrated that,P and K fertilizers as basic fertilizer,and N fertilizer as basic fertilizer,jointing fertilizer and big trumpet fertilizer and as basic fertilizer with one deep application were the best techniques of fertilizer application.