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| DOI：10.13522/j.cnki.ggps.2025391 |
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| Effect of biogas slurry from rural sanitation improvement on mung bean growth and soil nutrient |
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WU Hao, ZHANG Tiejian, DUAN Chushuo, ZHANG Xu, ZHANG Liyong, LIU Hongquan
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College of Urban and Rural Construction, Hebei Agricultural University, Baoding 071001, China
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| Abstract: |
| 【Objective】The fermented biogas slurry produced from upgraded rural sanitation systems is a potential organic fertilizer, but its effect on crop growth and soil nutrients is poorly understood. Taking mung bean as an example, we experimentally address this knowledge gap.【Method】The field experiment consisted of nine treatments: no fertilization (CK), a single application of chemical fertilizer (CF), a single application of biogas slurry with its nitrogen equivalent to 75% (T1), 100% (T2), 125% (T3), and 150% (T4) of the nitrogen content in the chemical fertilization treatment, and combinations of biogas slurry and chemical fertilizer, in which the nitrogen supplied by biogas slurry accounted for 75% (T5), 50% (T6), and 25% (T7) of that in the chemical fertilization. During the experiment, we measured mung bean growth, yield, seed quality, nutrient uptake, and soil fertility in each treatment.【Result】Fertilization significantly increased the yield of mung beans. There was no significant difference in mung bean yields between CF, T1, T2, T4 and T6, although the yield of T6 was the highest but without statistical significance. Applying biogas slurry significantly increased the accumulation of nitrogen, phosphorus, and potassium in mung bean straw and seeds, as well as the crude protein content of the seeds; it also significantly improved soil nutrient status. Compared with CK, T5 and T7 increased soil organic matter by 48.73% and 59.06%, respectively. When biogas slurry was applied alone, available soil nitrogen increased with increasing biogas slurry application rate. The combined application of biogas slurry and chemical fertilizer significantly increased the content of available soil phosphorus and potassium. T6 and T7 increased available soil phosphorus by 174.7% and 262.33%, and available soil potassium by 21.84% and 30.24%, respectively. A comprehensive evaluation using the membership function method indicated that T6 achieved the highest overall score.【Conclusion】Our results showed that combining 50% biogas slurry nitrogen with 50% chemical fertilizer nitrogen was the optimal treatment. It can be used as an improved fertilization strategy for effective utilization of waste from upgraded rural sanitation systems to enhance mung bean yield and soil health in regions similar to the experimental site. |
| Key words: rural toilet sewage; biogas slurry; mung bean; nutrient absorption; soil fertility |
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