Integrated nitrogen amount and sources maximize maize nitrogen efficiency in the saline soils

文献类型： 外文期刊

第一作者： Miao, Qi

作者： Miao, Qi;Zhang, Jishi;Chen, Yongliang;Cui, Zhenling;Miao, Qi;Zhang, Jishi;Chen, Yongliang;Cui, Zhenling;Zhang, Jishi;Xue, Yanfang;Cui, Zhenling

作者机构：

期刊名称：AGRONOMY JOURNAL （ 影响因子：1.683； 五年影响因子：2.095 ）

ISSN： 0002-1962

年卷期： 2021 年 113 卷 2 期

页码：

收录情况： SCI

摘要： Although efficient N fertilization has become widely accepted for sustaining or improving N use efficiency (NUE), many existing N fertilizer recommendations seldom consider N sources during implementation. To investigate the effect of N rates and sources on maize (Zea mays L.) production efficiency, soil quality, and economic benefits, a field experiment was conducted in the coastal saline area of China. The optimal N rate (ONR) treatment based on in-season root-zone N management reduced N application amount by 44% without grain yield losses and decreased the apparent N losses by 144 kg N ha(-1) compared with the local N management practice of farmers. Furthermore, the ONR treatment with ammonium sulfate (ONR-AS) or calcium ammonium nitrate (ONR-CAN) had higher maize grain yield and NUE than the ONR with urea (ONR-urea) treatment. Compared with ONR-urea, treatment with ONR-AS or ONR-CAN increased Ca2+ content, decreased soil pH and Na+ content, and thus imporved maize yield and NUE. Among the ONR treatments, the ONR-AS treatment increased economic gains compared with the ONR-urea treatment. This study suggests that an integrated N management can increase maize yield, NUE, and economic benefits and improve soil quality in the coastal saline soils.

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