The study was carried out in field conditions and use conventional compound fertilizer as the control group to explore the effect of compound fertilizers containing 2%, 4%, 6%, or 8% humic acid on the yield and quality of chilli. The effect of humic acid-compound fertilizer treatment under continuous cropping conditions was investigated, 6% humic acid-compound fertilizer was conducted for four consecutive years and using conventional compound fertilizer as the control group. The results show that humic acid fertilization significantly improved the yield and quality of chilli, and the overall improvement was directly proportional to the dosage of humic acid. An evaluation based on benefit, yield, and various quality indicators concludes that compound fertilizer with 6% humic acid was the optimal ratio, which increased the yield by 14.07% in the first year compared to that in the control group. The application of humic acid-compound fertilizer effectively reduced the impact of continuous cropping on the yield and quality of chilli, and the combined decline in the yield and quality was significantly less than that in the control group. In the fourth year, the yield of 6% humic acid-compound fertilizer treatment was 33.6% higher than that of conventional fertilizer.

For exploring the green methods of soil disinfection, the disinfection effects of ozone water at different mass concentrations on three soil-borne pathogenic fungi, Fusarium oxysporum, Rhizoctonia solani, and Botrytis cinerea, were studied. The results showed that ozone water in the mass concentration range of 1.0~5.0 mg/L has certain sterilizing effect on the spores of the three pathogenic fungi. The mass concentration of ozone water is the main factor affecting the sterilization rate, whereas the treatment time has no significant effect on it. Increasing the mass concentration of ozone water and the frequency of irrigation can significantly enhance the sterilization rate of the three pathogenic fungi in the soil. Irrigation of the soil with ozone water can significantly reduce disease incidence in plants. However, it leads to growth inhibition, and the introduction of Trichoderma can eliminate this inhibition.

To explore rapid utilization methodsfor pruning apple branches, cucumber (Jinyan No. 4) was used as a test material to study the effects of Trichoderma harzianum T11-W and apple branch sawdust on its seedling growth. T. harzianum T11-W was added to the sawdust in advance in one group (this was considered treated sawdust), whereas the other group involved the simultaneous addition of T. harzianum T11-W to sawdust. These two groups were compared with untreated apple branches (raw sawdust) and T. harzianum T11-W alone. Results showed that T. harzianum T11-W exhibited the most significant growth-promoting effect on cucumber seedlings, and when the mass fraction of sawdust was 0.7%, the root length inhibition of sawdust was weakened and the dry weight of its root was further increased by adding T. harzianum T11-W. Although the comprehensive evaluation of Trichoderma with sawdust treatment (treated sawdust or raw sawdust) was not as good as that of T. harzianum T11-W treatment alone, they have the highest root-cap ratio. When the raw sawdust dosage was 0.35%, the promotion of cucumber seedling growth was weaker than that of the control group that did not undergo any treatment. When the dose was 0.7%, the growth-promoting effect was higher than that of the above-mentioned control group, indicating that increasing the amount of raw sawdust facilitated cucumber seedling growth. When the sawdust dosage was 0.35%, the growth-promoting effect of treated sawdust on cucumber seedlings was better than that of raw sawdust.