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Spatiotemporal optimization of irrigation practices for winter wheat in China: Rationale, implications, and solutions

Author

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  • Zhang, Luchen
  • Cao, Yuan
  • Qian, Weihao
  • Tian, Junning
  • Huang, Shengshi
  • Qiu, Xiaolei
  • Liu, Bing
  • Tang, Liang
  • Xiao, Liujun
  • Cao, Weixing
  • Zhu, Yan
  • Liu, Leilei

Abstract

In recent years, the increasing frequency and intensity of drought events have posed significant challenges to wheat production in China, making irrigation a crucial measure to mitigate associated yield losses. However, the escalating issues of water scarcity and groundwater depletion necessitate the development of strategies to reduce water use while sustaining crop production. In this study, the Crop Water Deficit Index (CWDI) and Moisture Index (MI) were employed to assess the drought stress and its impact on yield within the main winter wheat production region of China. Subsequently, a multi-model ensemble approach integrated with a multi-objective optimization algorithm was utilized to propose the optimized irrigation strategies, which could enhance water use efficiency while attaining high yields. The results showed a continuous increase in drought stress over the past four decades, with the North Subregion (NS) and Huang-Huai Subregion (HHS) experienced more severe drought stress, while drought stress in the Middle-Lower Reaches of Yangzi River Subregion (MYS) increased the most. Drought stress was most severe during the jointing to heading period; furthermore, the greatest increase in drought stress was also observed during this period. Over the past four decades, due to the intensification of drought stress, winter wheat yield in China has been declining at a rate of 0.36 % per year. Compared to the irrigation practices of farmers, the optimal irrigation practices not only increased the wheat yield, water use efficiency (WUE), and irrigation water use efficiency (IWUE) by 468–5034 kg·ha−1, 1–13 kg·ha−1·mm−1, and 1–30 kg·ha−1·mm−1, respectively, but also reduced the irrigation amount and frequency by 4–118 mm and 0–2 times, respectively. The findings offer a method for quantitatively predicting and warning of the impacts of drought stress, and meanwhile support the formulation of irrigation strategies that maximize crop yield and water use efficiency and reducing water consumption in China.

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  • Zhang, Luchen & Cao, Yuan & Qian, Weihao & Tian, Junning & Huang, Shengshi & Qiu, Xiaolei & Liu, Bing & Tang, Liang & Xiao, Liujun & Cao, Weixing & Zhu, Yan & Liu, Leilei, 2025. "Spatiotemporal optimization of irrigation practices for winter wheat in China: Rationale, implications, and solutions," Agricultural Water Management, Elsevier, vol. 308(C).
    • Handle: RePEc:eee:agiwat:v:308:y:2025:i:c:s0378377425000113
    DOI: 10.1016/j.agwat.2025.109297
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