Response of Water and Nitrogen Utilization Efficiency of Maize to Phased Drought and Nitrogen Application
To clarify the effects of different nitrogen fertilizer application rates and phased drought on maize growth and water and water-nitrogen utilization efficiency,in this study,'Denghai Super 2'and'Zhengdan 958'were used as experimental materials to study the controlling effects of drought at the jointing stage,flowering stage and filling stage under different nitrogen fertilizer application rates on maize dry matter accumulation and water and nitrogen utilization efficiency through a pot experiment.The results showed that various phased droughts treatments both reduced the dry matter weight of maize grains,and reduced water use efficiency and nitrogen fertilizer use efficiency of maize.Drought appeared at flowering stage of maize had the maximal effects on the dry matter accumulation of grains,followed by drought appeared at jointing stage.Under drought conditions,increasing nitrogen fertilizer application rates promoted the grains accumulation and water use utilization efficiency of'Zhengdan 958',which had the strong drought resistance.But as for'Denghai Super 2',which had the weak drought resistance,the positive effects of increasing nitrogen fertilizer application rates were only appeared in drought at filling stage and full irrigation conditions.Nitrogen utilization efficiency of 2 varieties of maize decreased with increase of nitrogen fertilizer application rates.And the nitrogen fertilizer utilization efficiency of maize in drought condition at the filling stage was higher than that of other treatments(drought appeared at jointing and flowering stages,respectively).The experimental results provided a theoretical basis for water and fertilizer management of maize in the Huang-Huai-Hai region.
water-fertilizer couplingdrought stressdry matter allocationwater use efficiencyN use efficiency
万方数据
维普
