Determination of critical nitrogen concentration and dilution curve based on leaf area index for summer maize

文献类型： 外文期刊

第一作者： Zhao, Ben

作者： Zhao, Ben;Duan, Aiwang;Liu, Zhandong;Xiao, Junfu;Liu, Zugui;Qin, Anzhen;Ning, Dongfeng;Zhang, Weiqiang;Lian, Yanhao;Ata-Ul-Karim, Syed Tahir;Wang, Xiaolong

作者机构：

关键词： Summer maize; Critical nitrogen concentration; Leaf area index; Nitrogen nutrition index

期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）

ISSN： 0378-4290

年卷期： 2018 年 228 卷

页码：

收录情况： SCI

摘要： Injudicious nitrogen (N) fertilizer application has increased the risk of environmental pollution and decreased grain yields, farm profits, and N use efficiency. The plant based N diagnostic tools can be used to optimize N management of summer maize production. This study was designed to develop and validate a leaf area index (LAI) based critical N (N-c) dilution curve and to establish a theoretical framework to link the relationship of LAI and plant dry matter (DM) based curves, as well as to compare the differences between LAI, plant DM and growth stage-based N-c curves. Six field experiments were set with a range of N application rates (0-320 kg N ha(-1)) and plant densities (6 to 8 x 10(4) plants ha(-2)) using four summer maize cultivars (Zhengdan958, Denghai605, Xundan20, and Denghai661) in Henan province of China. LAI and plant N concentration (PNC) were determined from V6 to R1 stages in each experiment for the development of the N-c curve. LAI and PNC ranged from 1.28 to 6.12 and 1.34% to 3.31% under different N levels, respectively. Allometric relationships between LAI, plant DM, and critical N uptake (N-uc) were developed under non-N-limiting treatments. The relationship between N-c and LAI during vegetative growth period was described by a power function (N-c = 3.84LAI(-0.45)) N nutrition index (NNI) increased with the increasing N application rate and ranged from 0.56 and 1.23 across different N treatments. Our results validated that plant N uptake was proportional with LAI, and the allometric parameter between LAI and plant DM of summer maize was close to the theoretical value 2/3. The newly developed LAI-based N-c curve could identify plant N status (N-limiting and non-N-limiting) during key N requirement period of summer maize and can be used for precision N management for summer maize grown in China.

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