Powdered and granular organic fertilizers are the two most widely used types of organic fertilizers in agricultural production. Both use the same raw materials—livestock manure, crop straw, and medicinal herb residue—made through composting and fermentation. However, the finished product forms differ, and the core production line processes differ significantly. Simply put, the powdered organic fertilizer process is simplified, focusing on basic processing; the granular organic fertilizer process is complex, a deeper extension of the powdered process, with distinct procedures, equipment, and production standards.
The basic processes of both types of production lines completely overlap, representing a common pre-production process for organic fertilizers. The raw materials first undergo composting and fermentation in a compost turning machine to achieve harmlessness, eliminating pathogens, insect eggs, and harmful substances. Then, they enter a crushing stage to break down and refine clumps of raw materials. Next, impurities are filtered out and coarse materials are removed through screening equipment to ensure the purity and uniformity of the raw materials. After completing these processes, the powdered organic fertilizer production line can proceed to the final packaging stage. The entire process is simple, efficient, with fewer steps and low energy consumption.
The core difference between the two lies in the post-screening processing. Powder production lines have no subsequent processing steps; the sieved powder is directly mixed, quantitatively packaged, and requires no high-temperature treatment or shaping. Equipment configuration is simple, requiring only a compost turning machine, crusher, screening machine, and packaging equipment. Production cycle is short and investment cost is low.
Granular organic fertilizer production lines require several additional core processing steps on top of the powder process. The sieved powder is precisely proportioned and thoroughly mixed before being fed into a fertilizer granulator to form uniform granules. The freshly formed granules have high moisture content and a soft texture, requiring two processes: drum drying and natural cooling to reduce moisture and increase granule hardness. Some high-end production lines also add rounding and coating processes to optimize granule appearance and slow-release properties. Finally, a second screening process is used to select qualified granules before packaging and warehousing.
These process differences also result in different product characteristics and production adaptability. Powder processing is simple to operate and offers flexible production capacity, but the finished product is prone to dust generation and moisture absorption, leading to clumping. Granular processing involves more complex procedures and higher energy consumption, but the finished product is uniform, dust-free, and resistant to storage and transportation, with stronger slow-release fertilizer effects. During production, the appropriate process can be flexibly selected based on market demand and production capacity.
