One-time root-zone N fertilization increases maize yield, NUE and reduces soil N losses in lime concretion black soil

文献类型： 外文期刊

第一作者： Jiang, Chaoqiang

作者： Jiang, Chaoqiang;Lu, Dianjun;Zhou, Jianmin;Wang, Huoyan;Jiang, Chaoqiang;Zu, Chaolong;Shen, Jia;Wang, Shiji;Guo, Zhibin

作者机构：

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2018 年 8 卷

页码：

收录情况： SCI

摘要： Excess N-fertilizer application and inappropriate fertilization methods have led to low N use efficiency (NUE) and high N leaching. A field experiment was performed in a typical lime concretion black soil area to compare N application methods: split surface broadcasting (SSB) and one-time root-zone fertilization (RZF) on grain yield, NUE, the fate of N-15 urea and soil N loss during the 2015 and 2016 maize growing seasons. Each application method was tested at N rates of 135 and 180 kg N ha(-1), and a control (CK) with no N fertilizer. The RZF treatment remarkably increased grain yield by 7.0% compared with SSB treatment under 180 kg N ha(-1), and significantly increased N derived from fertilizer by 28.5%. The residual N-15 in the 0-80 cm soil layer was 40.6-47.6% after harvest, 61.8-70.9% of which was retained in 0-20 cm. The RZF remarkably increased the 15N recovery in maize by 28.7%, while significantly decreased the potential N losses by 30.2% compared with SSB in both seasons. In conclusion, one-time RZF of urea is recommended for obtaining high yields, increasing NUE, and minimizing N losses in maize, which deserves more attention for developing and applying in the future.

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