Organic fertilizer fermentation constitutes the core stage in the production of organic fertilizers. The key to successful organic fertilizer production lies in the scientific regulation of this specific fermentation stage. By harnessing the metabolic activity of microorganisms, this process decomposes organic waste—such as livestock and poultry manure, crop straw, and kitchen scraps—transforming it into a stable, harmless, and nutrient-rich fertilizer. The entire process requires rigorous scientific control to achieve the metamorphosis from "waste" into "soil gold," thereby simultaneously resolving pollution issues and providing a sustainable, eco-friendly impetus for agricultural production.
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The first step in fermentation is raw material pretreatment, which serves as the foundation for a successful outcome. Raw materials—such as livestock manure and straw—must be sorted to remove impurities like plastics and metals. Subsequently, the straw is shredded into pieces measuring 3 to 5 centimeters to increase the surface area available for microbial contact. Concurrently, key parameters must be adjusted: the carbon-to-nitrogen (C/N) ratio should be controlled within the range of 23:1 to 28:1, and the moisture content should be regulated to between 52% and 68% (ideally, the material should form a clump when squeezed by hand but crumble upon being dropped). When necessary, highly efficient microbial inoculants are added to ensure that the conditions required to initiate fermentation are met.
Once pretreatment is complete, the process enters the main fermentation phase—the core of the entire operation—which is divided into three distinct stages: the temperature-rising stage, the high-temperature stage, and the cooling stage. The temperature-rising stage lasts 1 to 3 days; during this period, mesophilic microorganisms become active, breaking down easily degradable organic matter and causing the temperature of the compost pile to rise rapidly to above 50°C. The high-temperature stage is maintained at 50°C to 60°C—potentially reaching peaks of 70°C to 80°C—and lasts for approximately 10 days; thermophilic microorganisms become the dominant agents during this phase, effectively eliminating pathogenic bacteria, insect eggs, and weed seeds, thereby achieving the detoxification and sanitization of the waste material. As the easily degradable organic matter becomes depleted, the temperature gradually begins to decline, marking the transition into the cooling stage; during this phase, microorganisms begin to convert the decomposition products into humus.
Following the main fermentation, a post-maturation phase is required to further enhance the quality of the fertilizer. At this stage, the temperature of the compost pile returns to ambient levels; the material is piled to a height of less than one meter and allowed to undergo natural fermentation for 15 to 30 days. During this period, microorganisms continue to break down recalcitrant substances—such as lignin—making the fertilizer more stable and rendering its nutrients more readily absorbable by crops. Throughout this phase, mechanical compost turners may be utilized to periodically turn the piles; this practice efficiently replenishes oxygen—thereby preventing anaerobic fermentation and the generation of foul odors—while simultaneously ensuring that the material matures more uniformly, significantly boosting the efficiency of the post-maturation process. The entire fermentation process takes approximately 20 to 30 days. The criteria for determining when fermentation is complete are straightforward: the material turns a deep brown color, is free of foul odors while emitting a fresh, earthy scent, possesses a loose texture, and its temperature approaches ambient temperature. The resulting fermented organic fertilizer not only retains the nutrients present in the raw materials but is also rich in microbial metabolic byproducts; it serves to improve soil structure, enhance soil fertility, reduce the reliance on chemical fertilizers, and foster the development of ecological agriculture.
While the fermentation of organic fertilizer may appear simple, it is, in reality, the result of the synergistic interplay between microorganisms and various environmental parameters. Only through the scientific control of raw material ratios, temperature, humidity, and aeration conditions can high-quality organic fertilizer be produced—thereby transforming organic waste into a valuable resource that simultaneously safeguards the ecological environment and provides natural nourishment for crop growth.
