数字农科院2.0

Regulated Deficit Irrigation Improves Yield Formation and Water and Nitrogen Use Efficiency of Winter Wheat at Different Soil Fertility Levels

文献类型： 外文期刊

作者： Wu, Xiaolei;Huang, Zhongdong;Huang, Chao;Liu, Zhandong;Liu, Junming;Cao, Hui;Gao, Yang

作者机构：

关键词： soil fertility level;regulated deficit irrigation;wheat yield;grain filling;resource use efficiency

期刊名称： AGRONOMY-BASEL

ISSN：

年卷期： 2025 年 15 卷 8 期

页码：

收录情况： SCIE（2025版）

摘要： Water scarcity and spatial variability in soil fertility are key constraints to stable grain production in the Huang-Huai-Hai Plain. However, the interaction mechanisms between regulated deficit irrigation and soil fertility influencing yield formation and water-nitrogen use efficiency in winter wheat remain unclear. In this study, a two-year field experiment (2022-2024) was conducted to investigate the effects of two irrigation regimes-regulated deficit irrigation during the heading to grain filling stage (D) and full irrigation (W)-under four soil fertility levels: F1 (N: P: K = 201.84: 97.65: 199.05 kg ha(-1)), F2 (278.52: 135: 275.4 kg ha(-1)), F3 (348.15: 168.75: 344.25 kg ha(-1)), and CK (no fertilization). The results show that aboveground dry matter accumulation, total nitrogen content, pre-anthesis dry matter and nitrogen translocation, and post-anthesis accumulation significantly increased with fertility level (p < 0.05). Regulated deficit irrigation promoted the contribution of post-anthesis dry matter to grain yield under the CK and F1 treatments, but suppressed it under the F2 and F3 treatments. However, it consistently enhanced the contribution of post-anthesis nitrogen to grain yield (p < 0.05) across all fertility levels. Higher fertility levels prolonged the grain filling duration by 18.04% but reduced the mean grain filling rate by 15.05%, whereas regulated deficit irrigation shortened the grain filling duration by 3.28% and increased the mean grain filling rate by 12.83% (p < 0.05). Grain yield significantly increased with improved fertility level (p < 0.05), reaching a maximum of 9361.98 kgha(-1) under the F3 treatment. Regulated deficit irrigation increased yield under the CK and F1 treatments but reduced it under the F2 and F3 treatments. Additionally, water use efficiency exhibited a parabolic response to fertility level and was significantly enhanced by regulated deficit irrigation. Nitrogen partial factor productivity (NPFP) declined with increasing fertility level (p < 0.05); Regulated deficit irrigation improved NPFP under the F1 treatment but reduced it under the F2 and F3 treatments. The highest NPFP (41.63 kgkg(-1)) was achieved under the DF1 treatment, which was 54.81% higher than that under the F3 treatment. TOPSIS analysis showed that regulated deficit irrigation combined with the F1 fertility level provided the optimal balance among yield, WUE, and NPFP. Therefore, implementing regulated deficit irrigation during the heading-grain filling stage under moderate fertility (F1) is recommended as the most effective strategy for achieving high yield and efficient resource utilization in winter wheat production in this region.

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