Microbial Inoculum Influences Nitrogen Transformation During Pig Manure Composting
This study aims to evaluate the effects of Bacillus velezensis LH-3 on ammonia emission and nitrogen retention during the aerobic composting process of pig manure with rice straw.A treatment group with the inoculation of LH-3 and a control group without strain inoculation were designed.The results showed that the compost in both groups met the high-temperature sanitization treatment standard,and the inoculation of LH-3 did not significantly alter the temperature of the compost pile.Notably,the LH-3 group completed the composting five days earlier than the control group.Moreover,the final product in the LH-3 group increased the seed germination index by 21.56% compared with that in the control group,demonstrating higher quality.Furthermore,LH-3 reduced the cumulative ammonia emission during the composting process by 33.42% and increased the total nitrogen in the final compost by 11.46% .In addition,LH-3 enhanced the abundance of the ammonia monooxygenase gene(amoA)and the hydroxylamine oxidoreductase gene(hao),thereby strengthening nitrification during the high-temperature composting stage.In conclusion,B.velezensis LH-3 serves as an effective biological additive that promotes the aerobic composting of pig manure,reduces ammonia emissions,and enhances nitrogen retention and overall quality of the compost product.
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