The invention relates to a preparation method of
trichoderma multifunctional soil modifying agents. The preparation method comprises the steps that:
trichoderma harzianum SH2303 with the CGMCC (China General
Microbiological Culture Collection Center) NO. 4963 is cultured on a
potato dextrose agar (PDA) culture medium for 2 to 3 days, a bacterial cake is punched by a hole puncher with the
diameter being 5mm, the bacterial cake is inoculated into a seed culture medium for 5 to 7 days at the bacterium
inoculation quantity of three tablets per
bottle and is then inoculated into a
spore production culture medium, the
fermentation is carried out for 5 to 7 days under the optimized culture condition in a 300 L
fermentation tank, and the number of thick-wall spores is (6 to 7)*10<8> / mL; and fermenting liquid and carriers are mixed according to the weight ratio of 1:1, the secondary
open type solid fermentation is carried out for 5 to 7 days at the normal temperature, and the number of
trichoderma conidiospores and chlamydospores is 200 to 500 million / g. The soil modifying agents prepared by the method have the main purposes of improving the primary and secondary salinization of vegetable planting soil and degrading the
organic phosphorus pesticide residue soil, and have the effects of treating soil-borne diseases, promoting the
crop growth and improving the
crop yield. Because only one trichoderma strain is utilized, the fermentation process is easy to optimize, the microbial inoculum preparation cost is low, the commercial large-scale popularization is easy to realize, and
high field general use values are reached.