Abstract:In this study, the watermelon and strawberry continuous cropping soils were used to conduct various reductive soil disinfestation (RSD) treatments, involving different incubation time (3, 4, 5 and 7 weeks), temperature (10, 20, 30 and 40℃), irrigating conditions (80%, 100% of the maximum field capacity and flooding) and organic material types (straw, straw+crow dung and straw+iron powder). The common factors influencing the improvement effect of RSD on different soils were analyzed through redundancy analysis and random forest analysis. Results showed that the electrical conductivity, Fusarium oxysporum abundance, proportion of fungi/bacteria and Fusarium oxysporum/fungi in both soils could be effectively reduced by RSD treatments, and pH in both soils were significantly increased after all of RSD treatments. However, these values of above-mentioned soil properties after different RSD treatments showed significant differences. The overall ranges of soil pH, electrical conductivity, and disinfestation effect were 6.48-8.64, 0.15-0.22 mS/cm, and 0.6%-99.9%, respectively. RSD treatments significantly increased soil pH when the temperature was higher than 10℃ for 3 weeks. The best removal effect of RSD on soil salinization was found in the soil flooding condition, and the disinfestation effect of Fusarium oxysporum was more than 99.7% in both RSD-treated soils at 40℃. Correlation analyses further revealed that the temperature was significantly correlated with pH and microbial properties in both soils after RSD treatments. Moreover, the contributions of the factors to the RSD disinfestation effects in both soils were ranked as follows:temperature > time > organic material > water content. In conclusion, our study shows that temperature is the most important factor affecting the RSD effects in different soil types.