While cow manure may seem like livestock waste, it is actually a high-quality raw material for making organic fertilizer. Through scientific processing, it can be transformed into "fertile gold" that nourishes the soil and improves crop quality. This transformation is not simply a matter of piling it up; it requires a series of rigorous processes, including pretreatment, high-temperature fermentation, and post-treatment. Each step is crucial to the quality and safety of the organic fertilizer, achieving both the resource utilization of waste and contributing to the development of green agriculture.
Pretreatment is the foundation of turning cow manure into organic fertilizer, and its core is removing impurities and adjusting the ratio. Fresh cow manure has a high water content and an unbalanced carbon-nitrogen ratio, so it needs to be screened to remove impurities such as glass, plastic, and bricks to avoid affecting subsequent fermentation and fertilization. Then, straw, sawdust, and other auxiliary materials are added in proportion to adjust the moisture content of the mixture to 55%-65% and the carbon-nitrogen ratio to 20:1-30:1. At the same time, standard agricultural microbial agents are added to provide the "power" for fermentation, ensuring that the microorganisms can efficiently decompose organic matter.
High-temperature fermentation is the core of the entire organic fertilizer production process and the key to achieving harmlessness. The pre-treated mixture is piled into windrows or placed in fermentation tanks, with the pile height controlled at 0.8-1.5 meters to ensure looseness and aeration. During fermentation, microorganisms multiply rapidly, and the pile temperature gradually rises. When the temperature at the measuring point reaches 65℃, it is necessary to promptly use a compost turning machine to turn the pile or ventilate it to maintain an aerobic environment and lower the temperature, preventing the high temperature from killing beneficial bacteria. This stage needs to last 7-15 days. The high temperature not only kills pathogens and weed seeds in the cow manure but also decomposes large organic molecules into small nutrient molecules that are easily absorbed by crops.
After fermentation, post-processing is required to improve quality. Granulation, drying, and cooling are key steps to enhance the usability of the organic fertilizer. First, the material moisture content is reduced to below 30% through sun-drying or baking. Then, larger particles of the semi-finished product are crushed and sieved to remove incompletely decomposed impurities, making the organic fertilizer loose and uniform in texture. The material then enters the granulation stage, where the crushed material is fed into a new type organic fertilizer granulator to produce uniformly sized granules for easy storage, transportation, and field application. After granulation, a second drying process is required to reduce the moisture content of the granules to below 15% to prevent mold growth during storage. The dried granules, being at a relatively high temperature, undergo cooling to bring the temperature close to room temperature, preventing high temperatures from affecting fertilizer efficacy and packaging. Quality testing is then conducted to ensure the finished product meets organic fertilizer standards, marking the completion of the initial transformation.
Finally, the finished product is stored and packaged to prevent nutrient loss. The qualified organic fertilizer is packaged in woven bags with a film covering and stored in a cool, dry place. During transportation, measures are taken to prevent moisture, sun exposure, and breakage. Through this series of processes, the originally pungent cow dung is transformed into odorless, long-lasting organic fertilizer.
The process of turning cow dung into organic fertilizer is an ecological practice of recycling. It not only solves the pollution problem caused by livestock waste, but also replenishes the soil with organic matter, alleviates soil compaction, and helps improve the quality and yield of crops, achieving a win-win situation for environmental protection and agricultural benefits, and truly turning "manure" into a valuable resource for protecting fertile soil.
