文献类型： 外文期刊
作者： Qiu, S. J.;He, P.;Zhao, S. C.;Li, W. J.;Zhou, W.;Jin, J. Y.;Qiu, S. J.;He, P.;Zhao, S. C.;Li, W. J.;Zhou, W.;Jin, J. Y.;Xie, J. G.;Hou, Y. P.;Grant, C. A.
作者机构：
期刊名称： AGRONOMY JOURNAL
ISSN： 0002-1962
年卷期： 2015 年 107 卷 1 期
页码：
收录情况： SCI
摘要： Optimizing N fertilization is important to improve both maize (Zea mays L.) yield and nitrogen use efficiencies (NUEs). A 3-yr maize field experiment (2008-2010) was conducted to evaluate the response of grain yield, aboveground biomass, plant N concentration, N uptake, and NUEs to fertilizer N rates from 0 to 280 kg N ha(-1) at three different rain-fed Haplic Phaeozem soils (FAO classification) in Northeast China, When N application rate increased from 70 to 280 kg N ha(-1) across all site-years, N recovery efficiency, N agronomic efficiency, N internal efficiency and N partial factor productivity decreased from 763 to 9.0%, 25.3 to 0.1 kg kg(-1), 70.7 to 40.8 kg kg(-1), and 145.6 to 22.8 kg kg(-1), respectively. Differences observed among the years and experimental sites were primarily caused by variability in rainfall and soil characteristics, The maximal grain yield of 11.0 Mg ha(-1) was achieved at an N rate of 210 kg N ha(-1) with normal rainfall. Nitrogen application beyond the optimal N rate did not consistently increase grain yield, and caused a decrease in NUEs. The range of optimal N rate for maize grain yield fell between 140 and 210 kg N ha(-1) at the three sites from 2008 to 2010 in Northeast China based on the best fitted models (quadratic, linear plus plateau, and quadratic plus plateau). The results provide guidelines for selecting N application rates to optimize both maize yield and NUEs in Northeast China.
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