The impact of Bacillus coagulans X3 on available nitrogen content, bacterial community composition, and nitrogen functional gene levels when composting cattle manure
Liu, B.; Chen, W.; Wang, Z.; Guo, Z.; Li, Y.; Xu, L.; Wu, M.; Yin, H.
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This study was designed to probe available nitrogen levels, bacterial community composition, and the levels of nitrogen functional genes present when composting cattle manure with or without the addition of Bacillus coagulans X3. Bacterial supplementation was associated with the prolongation of the thermophilic stage and improved maturity of the resultant compost. At the maturity stage, samples to which B. coagulans X3 had been added exhibited significant increases in ammonium nitrogen, nitrate nitrogen, and total nitrogen levels. The dominant bacterial phyla observed in these composting samples were Firmicutes, Proteobacteria, Bacteroidetes, Actinobacteriota, and Chloroflexi.B. coagulans X3 addition resulted in significant increases in relative Firmicutes abundance during the thermophilic and cooling stages, while also increasing amoA and nosZ gene abundance and reducing nirS gene levels over the course of composting. Together, these data suggest that B. coagulans X3 supplementation provides an effective means of enhancing nitrogen content in the context of cattle manure composting through the regulation of nitrification and denitrification activity.
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