Pig manure organic fertilizer vs. Conventional organic fertilizer: Production differences and key control points

Organic fertilizer raw materials are widely available, but pig manure, due to its unique physicochemical properties, exhibits significant differences in its organic fertilizer production process compared to traditional straw or mixed livestock manure. Simply copying common processes can easily lead to fermentation failure or unstable product quality. Raw Material Characteristics: Conventional organic fertilizers (such as cow manure + straw) have a carbon-to-nitrogen ratio of approximately 25:1, high fiber content, and a loose structure, requiring only natural ventilation to maintain an aerobic environment. Pig manure, however, has a carbon-to-nitrogen ratio as low as 13:1, with excess nitrogen and a moisture content often exceeding 80%, resulting in high viscosity and a tendency to caking. This "high nitrogen, high moisture" characteristic necessitates the addition of sawdust, rice husks, and other auxiliary materials to adjust the carbon-to-nitrogen ratio to around 30:1, while simultaneously reducing the moisture content to 60%-65%. Otherwise, the compost pile will rapidly become anaerobic, producing large amounts of hydrogen sulfide, resulting in nutrient loss and environmental pollution. Fermentation Management Ordinary raw materials, due to their high fiber content, require less frequent turning of the organic fertilizer compost turning machine, once a week is sufficient, mainly by controlling temperature through moisture regulation. Pig manure, however, requires frequent turning—initially every two days, combined with forced ventilation to prevent clumping. More importantly, pig manure often contains residual antibiotics and heavy metals; the fermentation temperature needs to be maintained at 55-65℃ for at least 10 days to effectively degrade some of these drug residues. This is a step that ordinary composting does not require special reinforcement. It is recommended to add a special composting agent to accelerate cellulose decomposition and promote antibiotic reduction. Product Uses and Risk Control: Fully decomposed pig manure organic fertilizer generally has a higher nitrogen content than ordinary products, resulting in faster fertilizer effects and making it suitable for nitrogen-demanding crops such as vegetables. However, if not thoroughly decomposed, the heat generated by secondary fermentation after application to the soil can easily burn roots; therefore, the aging period must be extended to at least 30 days. Ordinary organic fertilizer has relatively relaxed requirements for decomposition, focusing more on improving soil structure. Pig manure is not a "low-quality raw material," but rather a "specialized raw material." By understanding its unique characteristics and making targeted adjustments to the ratio of auxiliary materials, ventilation strategies, and composting cycles, the challenges can be transformed into unique advantages of high-nitrogen organic fertilizer.