Effect of Irrigation at Different Growth Period and Nitrogen Fertilizer on Transfer of Nitrate Nitrogen and Yield of the Spring Maize

The field experiment is conducted to study the effect of different irrigations at different growth stages and nitrogen treatments on the transfer of nitrate nitrogen in the field soil profile and yield.The results show that the irrigation water use efficiency based on biological yield and grain yield increases as nitrogen fertilizer rate.The biological and grain yield decreases and the irrigation water use efficiency increases with non-irrigation at any growth period,especially for the treatment of non-irrigation at two growth periods.There is obvious effect of biological yield with non-irrigation at the heading and mature stages.The grain yield has obvious effect with non-irrigation at the heading stage,the seedling and filling stages,the filling stage and the jointing stage.