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The benefits of using corn steep liquor powder as the main substrate to produce microbial fertilizer
Release time:
2024-08-29
Experiments have shown that corn steep powder can achieve a high fermentation density without adding other nutrients, and the soluble phosphorus in it effectively promotes the growth of functional microorganisms. And corn steep powder is a cost-effective fertilizer raw material that can significantly reduce the production cost of microbial fertilizers;
1: Characteristics of corn steep liquor powder products
Corn steep liquor powder is extracted from fresh corn steep liquor. Containing NPK7-7-7; 43% protein; 35% amino acids, as well as various vitamins, mineral nutrients, sugars, and other bioactive molecules. Making corn steep liquor powder into bacterial fertilizer can enhance its nutritional value and utilize the microorganisms in the fertilizer to regulate the microbial community structure in the soil, promoting healthy plant growth.
2: Advantages of using Corn steep powder as the main substrate to produce microbial fertilizers
One of the key factors affecting the quality of microbial fertilizers is the number of functional microorganisms contained in the fertilizer. Experiments have shown that corn steep powder can achieve a high fermentation density without adding other nutrients, and the soluble phosphorus in it effectively promotes the growth of functional microorganisms. And corn steep powder is a cost-effective fertilizer raw material that can significantly reduce the production cost of microbial fertilizers; This gives corn steep liquid a significant advantage in substrate selection for biological fertilizers.
Adding 4% glucose can enhance the phosphorus solubilization ability of microorganisms such as Aspergillus niger in corn steep water fermentation broth and increase the number of viable bacteria in fertilizers. This may be due to factors such as increased phosphatase activity after glucose addition.
3:Selection of strains suitable for corn steep solids
The experimenters collected 9 industrial strains for experiments in corn steep liquor medium, and finally screened the 3 most suitable strains for corn steep powder based on their phosphorus solubilization ability, protein hydrolysis ability, and cell growth ability: Bacillus subtilis 3301 had the highest number of growing bacteria; Bacillus licheniformis has the highest ability to hydrolyze proteins; Aspergillus niger has the highest ability to dissolve phosphorus.
In addition, Bacillus licheniformis can produce indole-3-acetic acid (IAA), iron chelators, and soluble phosphates, which have the characteristic of promoting the growth of plant microorganisms. Bacillus subtilis plays a significant role in the production of indole-3-acetic acid, biological control, soil remediation, and promotion of plant growth. Therefore, the above are ideal strains for developing multifunctional biofertilizers using corn steep liquor as a substrate.
Due to the mutual promotion between different strains, multiple strains can also be inoculated for symbiotic fermentation. Symbiotic fermentation has the advantages of higher total bacterial growth, increased soluble phosphorus content, and increased amino acid nitrogen content.
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