| Summary: | This study reports on the effects of pretreated biogas slurry on degraded farm soil properties, microflora and the production of <i>Capsicum</i> spp. The responses of soil properties, microorganisms and <i>Capsicum</i> spp. production to biogas slurry pretreated soil were determined. The biogas slurry pretreatment of degraded soil increases the total nitrogen (0.15–0.32 g/kg), total phosphorus (0.13–0.75 g/kg), available phosphorus (102.62–190.68 mg/kg), available potassium (78.94–140.31 mg/kg), organic carbon content (0.67–3.32 g/kg) and pH value of the soil, while the population, diversity and distribution of soil bacteria and fungi were significantly affected. Interestingly, soil ammonium nitrogen, soil pH and soil nitrate nitrogen were highly correlated with the population of bacteria and fungi present in the pretreated soil. The soil with biogas slurry pretreatment of 495 m<sup>3</sup>/hm<sup>2</sup> favored the seedling survival rate, flowering rate and fruit-bearing rate of <i>Capsicum</i> spp. and significantly reduced the rate of rigid seedlings. In this study, the application of 495 m<sup>3</sup>/hm<sup>2</sup> biogas slurry to pretreat degraded soil has achieved the multiple goals of biogas slurry valorization, soil biofertilization and preventing and controlling plant diseases caused by soil-borne pathogenic microorganisms. These findings are of significant importance for the safe and environmentally friendly application of biogas slurry for soil pretreatment.
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