One-time double-layer placement of controlled-release urea enhances wheat yield, nitrogen use efficiency and mitigates N2O emissions

文献类型： 外文期刊

第一作者： Akhtar, Muhammad

作者： Akhtar, Muhammad;Wu, Liuge;Chen, Jian;Deng, Aixing;Song, Zhenwei;Zheng, Chengyan;Zhang, Weijian;Su, Yuxiao;Zheng, Yuntan;Lu, Yulun;Zheng, Shanchao

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关键词： layered fertilization; controlled-release urea; nitrogen use efficiency; wheat yield; N2O emissions

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：4.8； 五年影响因子：5.7 ）

ISSN： 1664-462X

年卷期： 2025 年 16 卷

页码：

收录情况： SCI

摘要： Simultaneously enhancing the crop yield and reducing nitrous oxide (N2O) emissions presents a critical challenge in sustainable agriculture. The application of nitrogen (N) fertilizer is a key strategy to enhance crop yield. However, conventional N application practices often lead to excessive soil N accumulation, insufficient crop N uptake and elevated greenhouse gas (GHG) emissions. To address these issues, this study evaluated the effectiveness of one-time double-layer fertilization of controlled-release urea (CRU) in improving wheat yield, nitrogen use efficiency (NUE) and mitigating N2O emissions compared to single-layer fertilization. A two-year field experiment (2021-2023) was conducted with five treatments: zero N fertilizer (T0), one-time single-layer fertilization of urea at 8-10 cm soil depth (T1), one-time single-layer fertilization of CRU at 8-10 cm soil depth (T2), one-time double-layer fertilization of urea at 8-10 cm & 18-20 cm soil depth (T3), one-time double-layer fertilization of CRU at 8-10 cm & 18-20 cm soil depth (T4). The two-year average results indicated that one-time double-layer fertilization of CRU (T4) achieved the highest wheat yield (10.20 t ha(-1)) and NUE (19.13 kg kg(-1)), as well as the lowest N2O emissions (0.66 kg ha(-1)). Compared to single-layer CRU fertilization (T2), T4 increased wheat yield and NUE by 5.94% and 11.26%, respectively, while reducing N2O emissions by 22.50%. Furthermore, T4 optimized the soil microenvironment by lowering soil temperature and NO3--N content at 0-10 cm depth, while enhancing soil moisture and NH4+-N availability at 10-20 cm, thereby promoting plant N uptake and utilization. These findings suggest that the one-time double-layer fertilization of CRU synchronizes N release with crop demand and regulates soil N dynamics, offering a promising strategy to boost wheat productivity and minimize environmental impacts.

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