Inoculating exogenous bacterium Brevibacillus laterosporus ZR-11 in compost-maturing period could accelerate composting maturation by regulating physicochemical parameters and bacterial community succession

Abstract

In this experiment, Brevibacillus laterosporus ZR-11, a bio-control strain with resistance to Fusarium wilt in cucumber, was inoculated in the mature manure prepared for maturing composting; conventional detection and Illumina Miseq high-throughput sequencing were adopted to investigate the changes of physicochemical factors and microbial communities in the composting process; correlation analysis was also conducted, with the purpose of providing some reference for improving the production technology of biological manure and upgrading the quality of products. According to experimental results, in the maturing period, bacterial community structures underwent substantial evolutions in both the inoculated group and the non-inoculated group Microbial diversity analysis revealed that Firmicutes, Proteobacteria, and Actinobacteria were dominant bacterial phyla in both the inoculated group and the non-inoculated group in different period, but their relative abundances were higher in the former. Through analyzing physicochemical indicators, it was found that ZR-11 could increase the temperature of maturing composting pile, accelerate compost maturation, and enhance the abundance of bacterial communities in the pile. The results of this study provided some reference for improving the maturing ING composting production technology of biological manure and upgrading the quality of products.