Effect of Water and Nitrogen Coupling on N Absorption,Translocation and Yield of Winter Wheat under Drip Irrigation
CHEN Hui;HUANG Zheng-jiang;WANG Ji-chuan;PAN Xue-jiao;ZHANG Di;XU Ya-li;College of Plant Science,Tarim University;
【Objective】To clarify the mechanism of efficient use of nitrogen,the characteristics of N absorption and utilization of winter wheat in drip irrigation in southern Xinjiang were studied.【Method】Xindong22 was used as testing material,and split plot design was used where the main zone was fertigation treatments including N_0(0 kg/hm~2),N_1(138 kg/hm~2),N_2(207 kg/hm~2)and N_3(276 kg/hm~2);deputy district was drip irrigating treatments including W1(1,800 m~3/hm~2),W2(3,150 m~3/hm~2)and W3(4,500 m~3/hm~2)in spring based on the unified winter irrigation of 900 m~3/hm~2.【Result】(1)Proper increase of water and nitrogen supply was beneficial to increase nitrogen accumulation in winter wheat,and nitrogen accumulation of N_3W_2,N_3W_3,N_2W_2and N_2W_3was significantly higher than that of other treatments.(2)The main period of nitrogen accumulation was before anthesis with 78.28%of the total accumulation.The jointing-flowering stage was the peak of nitrogen uptake rate,and with N_3W_2,N_2W_3and N_2W_2treatments reaching the highest of 6.38 kg/(hm~2·d),5.81 kg/(hm~2·d)and 5.01 kg/(hm~2·d),respectively.(3)The amount of nitrogen translocation in each organ and its contribution rate to nitrogen accumulation of grain were leafstem+sheathspike axis+glume.Nitrogen translocation amount in vegetative organs of N_3W_2and N_2W_3was significantly higher than that by other treatments,reaching 158.34 kg/hm~2and 147.49 kg/hm~2,the grain protein content and protein yield of N_3W_2,N_2W_2and N_2W_3were significantly higher than those by other treatments,reaching 15.73%,15.41%and 14.18%,1,475.94 kg/hm~2,1,256.97 kg/hm~2and 1,217.78 kg/hm~2,respectively.(4)The yield components and water and nitrogen use efficiency of winter wheat under drip irrigation have significant coupling effects of water and nitrogen,the yields of N_3W_2,N_2W_3and N_2W_2were higher,and their agronomic efficiency of nitrogen fertilizer,nitrogen use efficiency and irrigation water use efficiency were also the largest.【Conclusion】207-276 kg/hm~2nitrogen rate and 3,150-4,500 m~3/hm~2spring drip amount were the suitable supply range in this region.When the nitrogen amount was 275.08 kg/hm~2,the drip irrigation was 4,457.89 m~3/hm~2(including winter irrigation of 900 m~3/hm~2),the yield could reach the maximum of 8,558.73 kg/hm~2.
【Fund】： 国家自然科学基金项目“新疆滴灌小麦水分高效利用原理与调控机理研究”(31260303);; 塔里木大学校长基金项目“滴灌小麦群体质量调控效应与高产途径研究”(TDZKGG201702);; 少数民族聚居团场科技特派员科技帮扶三年行动专项“南疆粮食高产高效生产关键技术集成与示范”(2013AA002);; 塔里木大学研究生科研创新项目“滴灌水氮运筹对小麦根冠生长及氮素利用效率的研究”(TDGRI201602)~~
【CateGory Index】： S512.11
【CateGory Index】： S512.11