Effect of Nitrogen Application on Accumulation of Dry Matter and Nitrogen,Yield of Spring Wheat under Drip Irrigation

To explore the effect of nitrogen application on accumulation amount of dry matter and nitrogen,and yield of drip irrigated spring wheat in Northern Xinjiang,an experiment of 5 nitrogen treatments(N0:0 kg·hm-2,N1:150 kg·hm-2,N2:300 kg·hm-2,N3:450 kg·hm-2 and N4:600 kg·hm-2) with dominantly applied cultivar Xinchun 6 was carried at experimental station,Shihezi University.The results showed that the accumulation of dry matter and nitrogen could be well fitted by logistic curve.The highest accumulation amount of dry matter and nitrogen could be obtained with the reasonable nitrogen application.The dry matter and nitrogen accumulation of treatment N2 were the highest with 19 745.03 and 310.97 kg·hm-2,respectively,which were higher than other treatments by 4.42% - 60.74% and 3.68% - 79.65%.Nitrogen use efficiency of drip irrigation spring wheat was significantly affected by nitrogen application rate.Firstly it increased and then decreases with the increase of nitrogen application rate.Applied nitrogen fertilizer can significantly improve crop yields by 22.24%,45.04%,37.59% and 24.47% for N1,N2,N3 and N4 treatments compared N0,respectively.The function fitted results between yield and nitrogen application rate showed that the highest yield could be obtained when nitrogen application rate was 366.83 kg hm-2.