Journal
MOLECULES
Volume 26, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/molecules26154441
Keywords
carbon preservation; composting; bacterial community; Bacillus subtilis; Bacillus licheniformis
Funding
- National Key RAMP
- D Program of China [2018YFD0501901]
- earmarked fund for the Jiangsu Agricultural Industry Technology System [JATS [2020]427]
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This study investigated the preservation of carbon during goat manure composting by inoculating different proportions of microbial agents. The results showed that the 1:1:1:1:2 ratio significantly enriched the total organic carbon content and reduced moisture content, pH value, hemicellulose, and lignin contents. Additionally, the preservation of carbon was attributed to the enrichment of humic acid carbon, decomposition of hemicellulose and lignin, as well as increased OTU amount and Lactobacillus abundance.
Carbon is the crucial source of energy during aerobic composting. There are few studies that explore carbon preservation by inoculation with microbial agents during goat manure composting. Hence, this study inoculated three proportions of microbial agents to investigate the preservation of carbon during goat manure composting. The microbial inoculums were composed of Bacillus subtilis, Bacillus licheniformis, Trichoderma viride, Aspergillus niger, and yeast, and the proportions were B1 treatment (1:1:1:1:2), B2 treatment (2:2:1:1:2), and B3 treatment (3:3:1:1:2). The results showed that the contents of total organic carbon were enriched by 12.21%, 4.87%, and 1.90% in B1 treatment, B2 treatment, and B3 treatment, respectively. The total organic carbon contents of B1 treatment, B2 treatment, and B3 treatment were 402.00 +/- 2.65, 366.33 +/- 1.53, and 378.33 +/- 2.08 g/kg, respectively. B1 treatment significantly increased the content of total organic carbon compared with the other two treatments (p < 0.05). Moreover, the ratio of 1:1:1:1:2 significantly reduced the moisture content, pH value, EC value, hemicellulose, and lignin contents (p < 0.05), and significantly increased the GI value and the content of humic acid carbon (p < 0.05). Consequently, the preservation of carbon might be a result not only of the enrichment of the humic acid carbon and the decomposition of hemicellulose and lignin, but also the increased OTU amount and Lactobacillus abundance. This result provided a ratio of microbial agents to preserve the carbon during goat manure aerobic composting.
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