The organic fertilizer produced by the microbial organic fertilizer production line process can be turned into granular organic fertilizer, which is convenient for fertilization and ensures the quality of organic fertilizer during sales and transportation. Microbial organic fertilizer refers to a type of fertilizer product that uses the life activities of microorganisms as the main raw material and organic fertilizer production equipment to achieve specific fertilizer effects on crops. Microbial fertilizers and micro fertilizers have essential differences: the former are living organisms, while the latter are mineral elements. Microbial resources are abundant, diverse in types and functions, and can be developed into fertilizers with different functions and uses. Moreover, microbial strains can be artificially selected and continuously purified and revitalized to enhance their vitality. With the further development of biotechnology, it has become possible to obtain the desired strains through genetic engineering methods.

There are many types of microbial fertilizers produced using organic fertilizer production equipment. Microbial fertilizer products are generally divided into two categories: one is the narrow definition of microbial fertilizers, which refers to the increase in the supply of plant nutrients through the life activities of microorganisms, including increasing the total supply of plant nutrients in soil and production environment, resulting in an improvement in plant nutritional status and an increase in yield. The representative variety of this type of microbial fertilizer is rhizobium fertilizer; Another type is the generalized microbial fertilizer, which refers to the life activities of microorganisms in it. It can not only increase the supply of plant nutrients, but also produce plant growth hormones, promote the absorption and utilization of nutrients by plants, or counteract the pathogenic effects of certain pathogenic microorganisms, reduce crop diseases and pests, and promote the increase of crop yield.

According to the types of microorganisms, they can be divided into five categories: ① Bacterial fertilizers (such as rhizobial fertilizers, nitrogen fixing bacterial fertilizers, phosphate solubilizing bacterial fertilizers, potassium solubilizing bacterial fertilizers, and photosynthetic bacterial fertilizers); ② Streptomyces fertilizer (such as antibiotic fertilizer); ③ Fungal fertilizers (mycorrhizal fertilizers: including ectomycorrhizal agents and endophytic mycorrhizal agents); ④ Algae fertilizers (such as nitrogen fixing blue-green algae bacterial fertilizers); ⑤ Compound microbial fertilizer, which is formed by combining two or more microorganisms in a planned ratio.

According to their functional characteristics, they can be divided into two categories:

1. Microbial inoculants use porous substances as adsorbents (such as peat) to adsorb fermentation broth and produce microbial inoculants. This microbial agent is used for seed mixing or root dipping. On the one hand, beneficial microorganisms in fertilizers increase the supply of plant nutrients through their life activities, improving the micro ecological environment of plant rhizosphere; On the other hand, beneficial microorganisms can form spatial competition with pathogenic microorganisms on the root surface and rhizosphere of crops through non-specific antagonistic effects, reducing the frequency and severity of pest and disease occurrence, thereby achieving the goal of increasing crop yield.

2. Compound microbial fertilizers belong to the category of compound fertilizers, which have diverse content and forms of compounding, including combinations of multiple microorganisms, beneficial microorganisms, and different additives. Among them, additives include composite products of various additives such as organic matter (animal manure, leather charcoal, lignite, etc.), inorganic matter (fertilizers, trace elements), etc.