What microbial strains can be added to a bio-organic fertilizer production line?

In a bio-organic fertilizer production line, the scientific selection of microbial strains directly determines the product's fertility and functional characteristics. High-quality microbial strains not only accelerate the decomposition of organic materials but also impart added value such as soil improvement and enhanced crop resistance. Currently, the mainstream microbial strains can be divided into four main functional categories.

Nitrogen-fixing microbial strains are a basic component of the bio organic fertilizer production line. Among them, rhizobia are suitable for leguminous crop-specific fertilizers, forming a symbiotic relationship with plant roots to fix atmospheric nitrogen, reducing the amount of chemical nitrogen fertilizer used. Nitrogen-fixing bacteria can fix nitrogen independently without a host, making them suitable for broad-spectrum organic fertilizer production, especially in infertile soils where they can significantly increase nitrogen supply. These strains are usually introduced at the initial stage of fermentation, and the ambient temperature needs to be controlled at 25-30℃ to ensure their activity.

Phosphorus- and potassium-solubilizing microbial strains are key to overcoming soil nutrient bottlenecks. Bacillus megaterium and Bacillus mucilaginosus are the most widely used. The former decomposes insoluble phosphates in the soil, while the latter releases potassium from silicate minerals. The combined use of these two can increase the available phosphorus and potassium content in the soil by more than 30%. These strains should be added in the later stages of material composting to avoid high temperatures damaging their enzyme activity.

Growth-promoting strains focus on enhancing crop physiological functions. Bacillus subtilis not only secretes auxins to promote root development but also improves soil aggregate structure; yeast produces various vitamins and organic acids, enhancing crop photosynthetic efficiency. These strains are often used as functional fortifying agents, mixed with the material before granulation, and are suitable for the production of fertilizers specifically for fruit and vegetable crops.

Disease-resistant strains are crucial for green planting. Trichoderma harzianum inhibits soil-borne diseases by competing for nutrient sites, while actinomycetes secrete antibiotic-like substances to prevent crop diseases. In bio-organic fertilizer production lines, these strains require a low-temperature mixing process to ensure that the effective viable bacteria count in the finished product is not less than 200 million CFU/g, meeting green agricultural production standards.

Scientifically combining different functional microbial strains can not only exert synergistic effects, but also customize special fertilizers for specific crops and soils. This is the core technological path for bio-organic fertilizer production lines to enhance product competitiveness.

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