Root-zone fertilization improves crop yields and minimizes nitrogen loss in summer maize in China

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

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： It is urgently to minimize nitrogen (N) loss while simultaneously ensuring high yield for maize in China. A two-year field experiment was conducted to determine the effects of root-zone fertilization (RZF) and split-surface broadcasting (SSB) on grain yield, N use efficiency (NUE), and urea-N-15 fate under different N rates (135, 180 and 225 kg ha(-1)). Results showed that RZF increased grain yield by 11.5%, and the N derived from fertilizer (Ndff%) by 13.1-19.6%, compared with SSB. The percentage of residual N-15 in the 0-80cm soil was 37.2-47.4% after harvest; most N-15 (64.4-67.4%) was retained in the top 20 cm. RZF significantly increased the N apparent recovery efficiency (NARE) and N-15 recovery in maize by 14.3-37.8% and 21.9-30.0%, respectively; while decreased N losses by 11.2-24.2%, compared with SSB. The RZF of urea can be considered a slow-release fertilizer, which better matches maize N demand and effectively reduces N losses. Overall, RZF achieved yields as high as the SSB, but with a 20-25% reduction in N application. These results help improve our understanding of N fate in the maize cropping system, and may help guide recommendations for N management in southeastern China.

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