Benefits of corn steep liquor powder for composting agricultural waste

Using plant residues and agricultural waste for composting often encounters problems such as long composting time, low composting temperature, and incomplete material decomposition due to their high content of lignocellulose; Therefore, adding some exogenous substances such as corn steep liquor, microorganisms, MnO2, and molasses as promoters is a good choice.

1: CSL powder can increase organic carbon content and reduce carbon loss

Corn steep powder is extracted from fresh corn steep liquor and contains 43% protein, 35% amino acids, NPK7-7-7, as well as abundant soluble sugars and vitamins, providing nutrients for microbial growth and reproduction. It can also significantly increase the carbon content at the beginning of composting. During the composting process, microbial activity consumes a large amount of organic carbon. Experiments have shown that adding Corn steep powder and not adding Corn steep powder to compost resulted in a 5.96% and 11.32% decrease in total organic carbon content after composting, respectively. This indicates that adding CSL powder can effectively reduce carbon loss during the composting process.

Corn steep liquor powder can also stimulate microbial activity and increase reactor temperature; This is very beneficial for reducing carbon loss during composting and increasing the conversion and retention of organic carbon.

2: CSL powder can promote nitrogen conversion during composting process

In untreated compost, nitrogen conversion is only fastest during the cooling period. In comparison, the addition of corn steep liquor powder significantly promoted nitrogen conversion throughout the entire composting process; And adding corn steep liquor powder improved various reactions after the high-temperature period in the composting process. Ureolysis can indirectly enhance the effectiveness of phosphorus; Phosphorus is a raw material for microorganisms to carry out carbon and nitrogen metabolism and synthesize phosphorus containing macromolecules. And reactions such as nitrification, nitrate and nitrite ammonification can promote the mutual transformation of nitrate nitrogen and ammonia nitrogen to maintain the total nitrogen balance during the composting process. The nitrogen fixation ability of bacteria in compost with corn steep liquor powder added is significantly higher than that in untreated compost, resulting in a higher nitrogen retention rate;

3: Corn steep powder can promote microbial activity during composting process

Corn steep powder can alter the community structure of microorganisms, increasing their diversity and richness;  It also promotes symbiotic effects among microorganisms and increases the secretion of degradation enzymes;

Proteobacteria, Firmicutes, Actinobacteria, and Bacteroidetes are recognized as key bacterial genera for degrading lignocellulose. Adding corn extract powder can provide a better environment for actinomycetes and Firmicutes to grow more efficiently. Experimental results have shown that adding corn extract powder to compost increases the richness of Proteobacteria, Firmicutes, and Actinobacteria, stimulates the activity of low richness microorganisms, and promotes the participation of more bacterial genera in carbon and nitrogen metabolism; This promotes faster degradation of organic matter, less nutrient loss, and higher heap temperature; Promote the conversion of carbon and nitrogen, thereby promoting the formation of humic acid and forming macromolecular humic substances.

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