Microbial agents refer to live microbial preparations made by industrial production and expansion of target microorganisms (effective bacteria), using porous substances as adsorbents (such as peat and vermiculite) to adsorb the fermentation broth of the bacterial cells. This microbial agent is used for seed mixing or root dipping, and has direct or indirect effects on improving soil, restoring soil fertility, preventing soil borne diseases, maintaining the balance of rhizosphere microbiota, and degrading toxic substances