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Purpose <p>This study aims to determine the optimal parameters of a water-conducting device suitable for the distribution range of tomato roots within biogas slurry indirect subsurface drip irrigation system.</p> Methods <p>Used HYDRUS-2D model and measured soil characteristic parameters of different biogas slurry ratio and biochar mixed treatment to construct a soil water movement model for indirect subsurface drip irrigation with biogas slurry, and the accuracy of this model was validated using measured data.&#xa0;Subsequently, the model was utilized to further&#xa0;simulate the effects of different initial soil water contents and water conduction device parameters on soil wetting body and water distribution characteristics. Furthermore, in the greenhouse experiment, the distribution range of tomato roots was investigated by the grid method.</p> Results <p>Shape and size of the soil wetting body were influenced by the initial soil moisture content and parameters of the water-conducting device. Under the biogas slurry ratio of 1:4 and biochar mixing amount of 2% (optimal treatment of soil hydraulic properties), the optimal water guide device parameters for planting tomatoes were permeable boundary radius of 4.7&#xa0;cm, height of 10&#xa0;cm, and buried depth of 16&#xa0;cm.</p> Conclusion <p>The constructed HYDRUS-2D model could more accurately describe the water transport characteristics of the biogas slurry indirect subsurface irrigation, expanding the application scenario of the HYDRUS-2D model, provided a theoretical basis for determining appropriate water guide device parameters, thereby guided the popularization and application of biogas slurry indirect subsurface irrigation technology.</p>

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Infiltration simulation and water-conducting device parameter optimization for biogas slurry indirect subsurface drip irrigation using HYDRUS-2D model

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • Jian Zheng,
  • Peng Xiang,
  • Yan Wang,
  • Haowen Yang

摘要

Purpose

This study aims to determine the optimal parameters of a water-conducting device suitable for the distribution range of tomato roots within biogas slurry indirect subsurface drip irrigation system.

Methods

Used HYDRUS-2D model and measured soil characteristic parameters of different biogas slurry ratio and biochar mixed treatment to construct a soil water movement model for indirect subsurface drip irrigation with biogas slurry, and the accuracy of this model was validated using measured data. Subsequently, the model was utilized to further simulate the effects of different initial soil water contents and water conduction device parameters on soil wetting body and water distribution characteristics. Furthermore, in the greenhouse experiment, the distribution range of tomato roots was investigated by the grid method.

Results

Shape and size of the soil wetting body were influenced by the initial soil moisture content and parameters of the water-conducting device. Under the biogas slurry ratio of 1:4 and biochar mixing amount of 2% (optimal treatment of soil hydraulic properties), the optimal water guide device parameters for planting tomatoes were permeable boundary radius of 4.7 cm, height of 10 cm, and buried depth of 16 cm.

Conclusion

The constructed HYDRUS-2D model could more accurately describe the water transport characteristics of the biogas slurry indirect subsurface irrigation, expanding the application scenario of the HYDRUS-2D model, provided a theoretical basis for determining appropriate water guide device parameters, thereby guided the popularization and application of biogas slurry indirect subsurface irrigation technology.