According to the different types of plant growth promoting rhizobacteria (PGPR) contained, microbial fertilizers are divided into bacterial micro-fertilizers, actinomycete micro-fertilizers, and fungal micro-fertilizers.
According to the principle of action, they can be divided into rhizobia, phosphate-solubilizing bacteria, potassium-solubilizing bacteria, ectophytic or endophytic mycorrhizal fungi, photosynthetic bacteria, and organic material decomposition agents.
According to the functional diversity of micro-fertilizers, they can be divided into: single strain preparations, multi-strain preparations, microbial fertilizer compound preparations, microbial trace element compound preparations, and microbial organic fertilizer preparations.
According to the dosage form, they can be divided into: liquid, powder, granular, and freeze-dried.
According to the properties of the finished product, they can be divided into: liquid, mainly used for seed dressing and foliar spraying; solid granular, used for basal application or topdressing.
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