The creation of organic fertilizer is an ecological magic of turning waste into treasure. It uses agricultural and forestry waste such as straw, fallen leaves, and sawdust, as well as livestock manure such as chicken and cow dung, as raw materials. Through multiple scientific processes, it is transformed into green fertilizer that nourishes crops and improves the soil, solving agricultural waste pollution and showcasing the wisdom of circular agriculture.

Raw material screening is the first step in quality control, requiring the removal of impurities such as plastics and metals to avoid damaging the soil. After screening, pretreatment begins: the raw materials are crushed to 2-5 cm, and high-carbon and high-nitrogen materials are mixed at a carbon-to-nitrogen ratio of 25:1-30:1. The moisture content is adjusted to 55%-60% using a watering device. At this stage, the raw materials clump together tightly but crumble easily when touched, creating a suitable environment for microorganisms. An imbalance in the carbon-to-nitrogen ratio will lead to fermentation stagnation.
Fermentation and maturation are the core steps, commonly using aerobic fermentation with turning and aeration or anaerobic fermentation in a sealed environment. Aerobic microorganisms decompose organic matter, initially raising the pile temperature to above 55℃ and maintaining this temperature for 7-10 days, killing pathogens, insect eggs, and weed seeds. During the cooling period, the microorganisms convert the organic matter into nutrients such as humus. The pile needs to be turned 3-4 times with a compost turning machine to ensure uniformity. After 45-60 days, the raw material turns dark brown and has no odor, indicating fermentation is complete.
After fermentation, the raw materials enter the post-processing stage, which is a crucial step in the organic fertilizer production line to improve product form and quality. Granulation is the core step. After drying (moisture content below 20%) and screening, the organic fertilizer material needs to be processed into granules using an organic fertilizer granulation machine. A commonly used granulation process is disc granulation, which utilizes the centrifugal force generated by the rotation of a disc to cause the material to roll and agglomerate into spheres within the disc. Immediately after granulation, the material is dried and cooled: a drum dryer is used to dry it at 80-100℃ until the moisture content is below 12%, and a cooler uses ambient temperature air to lower the temperature, with a temperature difference not exceeding 5℃ to prevent moisture from seeping back into the packaging.
After drying and cooling, the granules undergo a second screening to remove broken particles. Some products are treated with beneficial microbial agents such as Bacillus subtilis to enhance fertilizer efficacy. Subsequently, an automatic packaging machine packages them into 25 kg and 50 kg sizes, with key information clearly labeled on the packaging bags. Finally, quality inspectors conduct random sampling tests on organic matter content (≥45%), pH value, heavy metal content, etc. Only after all standards are met can the fertilizer be stored and sold, becoming a qualified commercial organic fertilizer.