Looking back at the history of fertilizer granulation, fertilizer was not granulated originally, and there was no record of granulation for thousands of years. The habit of fertilizer granulation comes from chemical fertilizer: on the one hand, it is to improve the utilization rate of chemical fertilizer, slow release of nutrients and reduce loss; on the other hand, it is to facilitate fertilization operation, facilitate mechanized fertilization, and also make the fertilizer product beautiful and easy to sell.

Biological organic fertilizer generally does not require granulation, especially solid microbial fertilizer that absorbs a large number of bacteria is not suitable for granulation. Even if active microorganisms are sprayed on the outside of granulated organic fertilizer, a considerable number of active microorganisms will be lost during granulation or spray drying. Factory granulation generally requires adding adhesives such as clay to the fertilizer, so that the fertility of the product is diluted. The granulation process is to increase the cost of organic fertilizer granulation equipment, labor, power, etc., and for the sake of beauty, it often causes the product sales price to rise.

Biological organic fertilizer can promote soil loosening, and the microorganisms in it also need a loose environment to play a greater role. The granulation process is not good for microorganisms. In my country, most fertilization processes use soil covering agronomic operations, so it is a reasonable agronomic measure to directly apply non-granulated bio-organic fertilizers into the soil. Fruit trees, vegetables, tea, etc., which best reflect the characteristics of bio-organic fertilizers, are covered with soil after fertilization. Therefore, in all agronomic processes of soil covering fertilization, granulation is not required. Direct use of dispersed bio-organic fertilizers can achieve satisfactory results in crop quality and yield, and save granulation costs. The price of non-granulated fertilizers is lower than that of granulated fertilizers. The use of non-granulated bio-organic fertilizers on field crops that need to improve soil properties is also very effective, and the performance-price ratio is also very high.