Study on the influencing factors of Trichoderma quantities in protected vegetable soils

Soil texture, cultivating ages, vegetable species, and crop rotation system can influence the quantity and distribution of Trichoderma, which mainly distributes in neutral loam and light loam are humid, rich in organic matters, and have good aeration; the quantity of Trichoderma has a close relationship with cultivating ages and the planting structure of vegetables. In continuous cultivation, when the cultivating ages is more than 10 years, the quantity of Trichoderma decreases; compared with continuous cropping field, even though the number in rotation land decreases, its proportion shows increasing tendency in fungi; the quantity of Trichoderma in the fields planting vegetables like onions and garlic is more than that in fields planting cucumbers. In soil factors, the content of soil organic matters has the most important influence on the quantity of Trichoderma, which show the most significant level, with the regressive equation being Y= 0.13×-1.07.