Responses of Tomato Growth and Soil Environment Properties to Integrated Deficit Water-Biogas Slurry Application Under Indirect Subsurface Drip Irrigation

Peng Xiang, Jian Zheng (), Panpan Fan, Yan Wang and Fenyan Ma
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Peng Xiang: College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Jian Zheng: College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Panpan Fan: College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Yan Wang: College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Fenyan Ma: College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China

Agriculture, 2025, vol. 15, issue 15, 1-26

Abstract: To explore the feasibility of integrated deficit water-biogas slurry irrigation under indirect subsurface drip irrigation, three deficit irrigation levels (60%FC, 70%FC, and 80%FC; FC represents field capacity) were established during the three growth stages of tomatoes. The results indicated that biogas slurry irrigation treatments increased the soil organic matter content in the root zone and water use efficiency (WUE) and reduced soil pH. As the degree of deficit increased, the plant height and stem diameter of tomatoes decreased significantly ( p < 0.05), particularly during the seedling and flowering-fruiting stages. A mild deficit during the seedling stage was beneficial for subsequent plant growth, yielding maximum leaf area (6871.42 cm 2 plant −1 ). Moderate deficit treatment at the seedling stage maximized yield, which was 19.79% higher than the control treatment in 2020 and 19.22% higher in 2021. The WUE of severe deficit treatment at the maturity stage increased by 26.6% (2020) and 31.04% (2021) compared to the control treatment. Comprehensive evaluation using TOPSIS combined with the weighted method revealed that severe deficit treatment at the maturity stage provided the best comprehensive benefits for tomatoes. In summary, deficit irrigation at different growth stages positively influenced tomato growth, quality, and soil environment in response to water-biogas slurry irrigation.

Keywords: Solanum lycopersicum; water and nutrient stress; water use efficiency; yield and quality; comprehensive quality evaluation (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
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