Substitution of Biogas Slurry for Chemical Fertilizer Improves Nitrogen Use Efficiency of Wheat by Decreasing Leaf Nitrogen Concentration and Increasing Leaf C/N Stoichiometry

文献类型： 外文期刊

第一作者： Sorecha, Eba Muluneh

作者： Sorecha, Eba Muluneh;Ruan, Renjie;Yuan, Yue;Wang, Yaosheng

作者机构：

关键词： Nutrient availability; Nutrient exchanges; Resource use efficiency; Soil-plant system

期刊名称：JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION （ 影响因子：3.1； 五年影响因子：3.6 ）

ISSN： 0718-9508

年卷期： 2025 年 25 卷 2 期

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收录情况： SCI

摘要： Biogas slurry (BS), a nutrient-rich organic fertilizer, can maintain nutrient balance by providing a steady nutrient supply during crop growth. Key indicators of nutrient balance and efficiency, such as nutrient ratios, particularly leaf carbon to nitrogen (C/N) stoichiometry, are critical for evaluating nitrogen use efficiency (NUE). However, the mechanisms by which leaf C/N stoichiometry, along with leaf nitrogen (N) concentration and carbon (C) content, regulates NUE under BS application remain poorly understood. This study examined five fertilization strategies including 100% chemical fertilizer (CF), and 25%, 50%, 75%, and 100% BS substitution for CF, all with the same N input, on soil C, N, C/N stoichiometry, leaf C, N, C/N stoichiometry, NUE, and grain yield. The results revealed that compared to CF alone, 50% BS substitution for CF significantly (p < 0.001) increased soil C by 44.88%, N by 28.87%, and C/N stoichiometry by 23.65%. These resulted in the enhanced leaf C by 4.73% and C/N stoichiometry by 36.90% while reduced leaf N by 19.24%. The structural equation modeling demonstrated that the elevated soil C/N stoichiometry was attributed to optimized soil N, which in turn decreased leaf N while increasing leaf C/N, leading to a 32.29% improvement in NUE, contributing to a 24.36% increase in grain yield. This finding was further confirmed by Random Forest analysis indicating that soil C/N stoichiometry and leaf C/N stoichiometry were key factors driving NUE. Therefore, adopting a 50% BS substitution is recommended to reduce CF use, thereby enhancing NUE for sustainable agriculture.

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