Trichoderma microbial agent, preparation method thereof and application of trichoderma microbial agent

The invention provides a trichoderma microbial agent, which comprises 50-70 parts of a decomposed substrate, 10-15 parts of bentonite, 12-16 parts of humic acid, 3-8 parts of plant ash, 3-8 parts of calcium superphosphate, 3-6 parts of medium trace elements, and 1-2 parts of a composite strain, and the composite strain comprises 40-50 parts of bacillus subtilis and 50-60 parts of trichoderma harzianum NJAU4742. The invention also provides a preparation method of the microbial agent and application of the microbial agent. After the microbial agent is continuously applied, the yield of citrus fruits and ponkan fruits is about 27% higher than that of citrus fruits and ponkan fruits treated by applying other biological agents as base fertilizers and is about 39% higher than that of citrus fruits and ponkan fruits treated by applying common organic fertilizers as base fertilizers, and meanwhile, the quality of citrus fruits and ponkan fruits is remarkably improved. 本发明提供了一种木霉微生物菌剂，其包括50-70份腐熟基质、10-15份膨润土、12-16份腐殖酸