Effect of water and nitrogen spatial coupling under alternate furrow irrigation and fertilizer placement on summer maize

Field experiment included furrow fertilizer placement with alternate furrow irrigation was conducted. The experiment had two factors and four levels design with three replications. The plots were randomly arrayed in field. The regression model of summer maize yield was established and optimal ratio of water and fertilization coupling under alternate and every furrow irrigation and fertilizer placement was determined. The results indicate that both water irrigation and fertilizer have pronounced effects on the maize yield under the experiment conditions, and the effect of N fertilizer application is more significantly than that of water irrigation. There are positive interactions between water, N and maize yield. The optimal ratio of water irrigation and N are 972 m3/hm2 and 230 kg/hm2, respectively, and the highest yield is 4076 kg/hm2. Compared with the traditional irrigation model, water and fertilization coupling effects of water saving and fertilization model have important theoretical and practical significance for reducing water resource waste and increasing fertilization use efficiency.