FAQ: At which stage of the bio-organic fertilizer production line are microbial strains added?

A: The primary stage for adding microbial strains is during the raw material fermentation and turning process. For some refined granular organic fertilizers, a secondary inoculation occurs during the subsequent mixing stage; however, adding strains during high-temperature drying or the final stages of granulation is strictly prohibited, as this is crucial for maintaining microbial viability and ensuring product quality.

In the standard operation of a complete bio-organic fertilizer production line, the microbial inoculants are primarily introduced during the raw material pre-treatment stage. First, raw materials such as cattle manure, chicken manure, and straw are proportioned and mixed, with adjustments made to the moisture content and carbon-to-nitrogen (C/N) ratio; subsequently, specialized fermentation inoculants are evenly distributed over the mixture and thoroughly blended using a mixer.Once the material enters the fermentation yard, small amounts of additional strains can be introduced during each turning operation performed by the windrow turner; this ensures thorough contact between the strains and the material, rapidly initiating high-temperature fermentation to decompose organic matter and eliminate pathogens and pest eggs.

A common mistake made by beginners occurs during the later stages of production. Microbial strains must not be added during the crushing, screening, granulation, or drying stages. The drying stage, in particular, is critical; high temperatures will directly kill beneficial bacteria, causing the fertilizer to lose its biological activity. When producing granular bio-organic fertilizer, a secondary inoculation at low temperatures is often performed during the mixing stage—prior to final packaging—to compensate for minor strain losses incurred during fermentation and granulation, thereby ensuring the microbial count meets required standards.

In short, the core principles are: add primarily during fermentation, supplement at low temperatures, and avoid addition during high-temperature stages. Properly managing the inoculation process not only improves raw material decomposition and shortens production cycles but also ensures that the finished organic fertilizer meets the required viable microbial count and complies with industry quality standards.