Optimizing planting density to improve nitrogen use of super high-yield maize

文献类型： 外文期刊

第一作者： Zhang, Guoqiang

作者： Zhang, Guoqiang;Shen, Dongping;Xie, Ruizhi;Ming, Bo;Hou, Peng;Xue, Jun;Li, Rongfa;Wang, Keru;Li, Shaokun;Chen, Jianglu

作者机构：

期刊名称：AGRONOMY JOURNAL （ 影响因子：2.24； 五年影响因子：2.829 ）

ISSN： 0002-1962

年卷期： 2020 年 112 卷 5 期

页码：

收录情况： SCI

摘要： High grain yield and N use efficiency are key goals of crop production. Increasing planting density and supplying adequate N application are important agronomic practices to increase maize grain yield. However, little is known about the interaction between the planting density and N application rate of high-yield maize under mulch drip irrigation. The objectives of this study were to determine the impacts of planting density and N application rate on the grain yield, economic return, nitrogen partial factor productivity (PFPN), and nitrogen agronomic efficiency (AE(N)) of super high-yield maize under mulch drip irrigation in Northwest China. To achieve this, field experiments were conducted in 2017 and 2018 in Qitai farm, Xinjiang. The experiments included four N application levels-no nitrogen (N0), and 270 (N1), 360 (N2), and 450 kg N ha(-1) (N3)-and five planting densities-7.5 (D1), 9.0 (D2), 10.5 (D3), 12.0 (D4), and 13.5 plants m(-2) (D5). It was found that the N2D4 treatment obtained the highest grain yield (21.5-21.6 t ha(-1)) and economic return (US$3,399.7-$3,440.3 ha(-1)) and the relative higher PFPN (59.7-60.1 kg kg(-1)) and AE(N) (23.7-25.1 kg kg(-1)). The PFPN and AE(N) declined with increasing N application and varied according to a quadratic relationship with increasing planting density. Therefore, a reasonable increase of planting density and an appropriate reduction of N application combined with integrated irrigation-fertilization technology under mulch drip irrigation cannot only obtain high maize yield and economic return but can also improve the N utilization efficiency.

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