Effects of different nitrogen managements on spring maize yield, water and nitrogen use efficiency under sprinkler fertigation
LI Jingjing1, ZANG Wenjing1, LI Yaojun1, GU Tao2, YAN Haijun1*
1. College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; 2. China Irrigation and Drainage Development Center, Beijing 100054, China
Abstract：To find out the optimal nitrogen management for spring maize under sprinkler fertigation in the semi-humid region of Northeast China, the field experiment was carried out in the northeast region in 2017, to study the effects of different sprinkler fertigation treatments on the spring maize grain yield, water and nitrogen use efficiency. Three treatments of the total nitrogen(N)application rates were 200 kg/hm2(N200), 160 kg/hm2(N160)and 120 kg/hm2(N120), respectively. During experiments, 60 kg/hm2 N and 10 kg/hm2 N were firstly applied in the sowing and seedling stages for all treatments, respectively. Rests of N were applied at three different N ratios: 1∶0(T1), 2∶1(T2), and 3∶1(T3)which were fertigated in the jointing stage and the filling stage, respectively. Results show that T1 obtains the highest nitrogen partial factor productivity(PFPN), nitrogen harvest index(NHI)and water use efficiency(WUE). Grain yield increases with the N application rates increasing. But there is no significant difference in grain yield between N200 and N160(P>0.05). T1N200 produces the highest yield among all treatments, with 12 489 kg/hm2. T1N160 has the highest NHI of 74.98 kg/kg. With the N application rates increasing, the PFPN decreases, but the amount of the mineral nitrogen(NO-3-N)accumulated in the 0~100 cm layer of soil after harvest increases. T1 treatment has the lo-west residual NO-3-N in the soil, which reduces the risk of nitrogen leaching out of the 0~100 cm soil layer. Based on the results, the recommended nitrogen application is 160-200 kg/hm2 in the semi-humid region of Northeast China, which contains 60 kg/hm2 N applied in the sowing stage, 10 kg/hm2 N fertigated in the seedling stage and rests of N fertigated in the jointing stage.
李晶晶,臧文静,黎耀军,顾涛,严海军*. 喷灌施氮管理对春玉米产量及水氮利用的影响[J]. 排灌机械工程学报, 2020, 38(12): 1277-1283.
LI Jingjing,ZANG Wenjing,LI Yaojun,GU Tao,YAN Haijun*. Effects of different nitrogen managements on spring maize yield, water and nitrogen use efficiency under sprinkler fertigation. Journal of Drainage and Irrigation Machinery Engin, 2020, 38(12): 1277-1283.
