Integrated nitrogen amount and sources maximize maize nitrogen efficiency in the saline soils
文献类型： 外文期刊
作者： Miao, Qi 1 ; Zhang, Jishi 1 ; Chen, Yongliang 1 ; Xue, Yanfang 4 ; Cui, Zhenling 1 ;
作者机构： 1.China Agr Univ, Coll Resources & Environm Sci, Beijing 100193, Peoples R China
2.China Agr Univ, Ctr Resources Environm & Food Secur, Beijing 100193, Peoples R China
3.Henan Acad Agr Sci, Inst Plant Nutr Resources & Environm, Zhengzhou 450000, Peoples R China
4.Shandong Acad Agr Sci, Maize Res Inst, Natl Engn Lab Wheat & Maize, Jinan 250100, Peoples R China
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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