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Chinese Agricultural Science Bulletin ›› 2026, Vol. 42 ›› Issue (4): 139-145.doi: 10.11924/j.issn.1000-6850.casb2025-0616

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Effects of Irrigation Volume of Vegetable Residues Biogas Slurry on Yield and Quality, Soil Enzyme Activity and Nutrients of Edible Dock

ZHU Yao1(), WANG Shunwang1, YUAN Luyi1, LI Wanxian1,2, LI Yonghui3, WANG Changmei1, WU Kai1, JIANG Jinhe1, ZHANG Wudi1, YIN Fang1()   

  1. 1 School of Energy and Environment Science, Yunnan Normal University, Kunming 650500
    2 Yunnan Innovation Biological Industry Incubator Management Co., Ltd., Kunming 650117
    3 Kunming Genzhili Biotechnology Co., Ltd., Jinning, Yunnan 650600
  • Received:2025-07-22 Revised:2025-12-17 Online:2026-02-27 Published:2026-02-27

Abstract:

Regarding the insufficient utilization of vegetable waste biogas slurry and the unclear effects of vegetable residues biogas slurry irrigation on the yield, quality and soil quality of edible dock, using edible dock as the material, a pot planting experiment was conducted with four biogas slurry irrigation gradient treatments (T1: 8 L/m2, T2: 10 L/m2, T3: 12 L/m2, T4: 14 L/m2) and a control treatment (CK) of clean water. The yield, quality, soil physical and chemical properties, and enzyme activities of edible dock were measured. The results showed: (1) Appropriate biogas slurry application significantly increased the yield and quality of edible dock. Compared with CK, the fresh weight of edible dock in each treatment increased by 134% to 233%, and the contents of chlorophyll, vitamin C, total sugar, reducing sugar and protein increased by 13.7% to 30.8%, 28.27% to 148.9%, 14.18% to 36.28%, 44.70% to 97.42% and 34.86% to 44.53%, respectively. The yield and quality improvement effect of T3 treatment was the most significant. (2) Biogas slurry application improved soil physical and chemical properties. The contents of soil organic matter, available potassium and total nitrogen increased by 17.09%, 170.7% and 40%, respectively, and the pH increased by 15.56% to 21.3%. This effectively alleviated the problem of acidic soil. (3) Soil urease and β-glucosidase activities increased with the increase in biogas slurry application amount, and the peak activity of T3 treatment was significantly higher than that of other treatments. (4) Excessive biogas slurry (T4) led to a decrease in reducing sugar content and a decrease in nutrient utilization efficiency. The study showed that the optimal biogas slurry application amount for edible dock irrigation with vegetable residues biogas slurry was 12 L/m2, which could synergistically improve crop yield, quality and soil fertility. Future field experiments can be conducted to verify, detect the risk of heavy metal accumulation in biogas slurry and soil, optimize the application period and frequency, and provide technical support for the large-scale agricultural use of vegetable residues biogas slurry.

Key words: vegetable residues biogas slurry, edible dock, yield, quality, soil quality, soil physical and chemical properties, enzyme activity