Grain yield and resource efficiency responses to water-nitrogen coupled input reduction: A global meta-analytical perspective

作者：Qianwen Fan, Liangjun Fei, You‐Liang Peng, Yalin Gao, Fangyuan Shen · 发表于：Agricultural Water Management · 年份：2025 · DOI：10.1016/j.agwat.2025.110059 · 被引用次数：4 · 研究领域：Irrigation Practices and Water Management、Climate change impacts on agriculture、Soil Carbon and Nitrogen Dynamics

Global water scarcity and excessive use of fertilizers have become important challenges for sustainable agricultural development. The effects of water-nitrogen coupling management under water-reduced and fertilizer-reduced conditions on the yield, water use efficiency (WUE), and nitrogen partial factor productivity (NPFP) of field crops, such as maize, wheat, and potatoes, were evaluated in this study via a meta-analysis. The findings demonstrated that while maintaining high yields, modest water and nitrogen reductions (about 10 %) substantially increased crop WUE and nitrogen use efficiency. On the other hand, extreme decreases in nitrogen and water led to a significant drop in production, especially for potatoes, which suffered the largest yield loss. Additionally, the effects of water-nitrogen coupling were strongly influenced by soil types, climate, and organic matter content. Compared to semi-humid environments, crops grown in arid and semi-arid environments were more sensitive to decreases in fertilizer and water. Water-nitrogen coupling management could optimize resource allocation, reduce water and fertilizer inputs, and improve crop productivity and resource utilization efficiency. The ideal levels of fertilization and irrigation for maize, wheat, and potatoes under water-nitrogen coupling conditions were 0.87I (I: full irrigation volume) and 0.81 N (N: maximum nitrogen application), 0.92I and 0.91 N, and 0.98I and 0.85 N, respectively. The maximum yields for maize, ...