Estimation of Nitrogen Supply for Summer Maize Production through a Long-Term Field Trial in China

文献类型： 外文期刊

第一作者： Huang, Shaohui

作者： Huang, Shaohui;Ding, Wencheng;Jiang, Lingling;Liu, Yingxia;Xu, Xinpeng;He, Ping;Huang, Shaohui;Yang, Wenfang;Jia, Liangliang;Yang, Yunma;Yang, Junfang

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关键词： total nitrogen supply; relative yield; nitrogen use efficiency; summer maize

期刊名称：AGRONOMY-BASEL （ 影响因子：3.417； 五年影响因子：3.64 ）

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年卷期： 2021 年 11 卷 7 期

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收录情况： SCI

摘要： Supplying adequate nitrogen (N) to meet crop demand is critical for enhancing agricultural sustainability. Not only fertilizer N, but also N from other available sources should be considered in N supply capacity. We conducted a 10-year farming experiment using a split-plot design with two different main fertilizer management approaches and three N application strategies as add-on sub-treatments. Based on the experiment, we estimated the total N supply (TNsupply) for the summer maize cropping system, through considering environmental, soil, crop residue, and fertilizer N sources. An appropriate TNsupply was established by correlating TNsupply with the relative yield (RY), N input and output, and N use efficiency (NUE). The results revealed a wide variation in TNsupply (from 88 to 755 kg ha(-1)). The RY, N input, and N output fitted well to TNsupply using linear-plateau, linear, and linear-plateau models, respectively. The lower limits of TNsupply for achieving the maximum RY and N output were 361 and 358 kg ha(-1), respectively. The relationship between N input and N output was described as linear-plateau. We determined the slope of the linear curve (55.4%) as the lower limit of NUE, beyond which the upper limit of TNsupply was determined to be less than 497 kg ha(-1). Thus, appropriate TNsupply values ranged from 325 to 497 kg ha(-1) for summer maize production, which could ensure enough N supply for higher yields and avoid excessive N input for higher NUE and lower environmental N loss. Our findings highlight that TNsupply can be an alternative indicator for evaluating N management.

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