CRITICAL NITROGEN CURVE AND NITROGEN NUTRITION INDEX FOR SPRING MAIZE IN NORTH-EAST CHINA

文献类型: 外文期刊

第一作者: Li, Wenjuan

作者: Li, Wenjuan;He, Ping;Jin, Jiyun;He, Ping;Jin, Jiyun

作者机构:

关键词: critical nitrogen concentration (N-c);nitrogen nutrition index (NNI);spring maize;dry matter

期刊名称:JOURNAL OF PLANT NUTRITION ( 影响因子:1.707; 五年影响因子:1.645 )

ISSN: 0190-4167

年卷期: 2012 年 35 卷 11 期

页码:

收录情况: SCI

摘要: The study was conducted at three sites during 2008 and 2009 in the North-East China Plain (NECP). Field experiments consisted of five or six nitrogen (N) fertilization rates (0-350 kg N ha(-1)). Shoot biomass and N concentration (N-c) of spring maize (Zea mays L.) were determined on six sampling dates during the growing season. Nitrogen application rate had a significant effect on aerial biomass accumulation and Nc. As expected, shoot Nc declined during the growing period. A critical N dilution curve (N-c = 36.5 W-0.48) was determined in China, which was a little different from those reported for maize in France and Germany. Besides, the N nutrition index (NNI) calculated from this critical N dilution curve was significantly related to relative grain yield, which can be expressed by a linear with plateau model (R-2 = 0.66; P < 0.001). NNI can be used as a reliable indicator of the level of N deficiency during the growing season of maize.

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