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. 2023 Jan 5:13:1084171.
doi: 10.3389/fmicb.2022.1084171. eCollection 2022.

Effects of microbial inoculant and additives on pile composting of cow manure

Qian Yang  1   2 , Shiqiu Zhang  3 , Xueping Li  1   2 , Kun Rong  1 , Jialiang Li  1 , Lihua Jiang  4   5
Affiliations

Effects of microbial inoculant and additives on pile composting of cow manure

Qian Yang et al. Front Microbiol. .

Abstract

Composting is an effective method of recycling organic solid waste, and it is the key process linking planting with recycling. To explore the reuse of agricultural organic solid waste as a resource in the Yellow River Delta, the effects of microbial inoculant and different additives (calcium superphosphate, biochar, tomato straw, rice husk, and sugar residue) on pile composting of cow dung were studied to obtain the best composting conditions. The results showed that microbial inoculant and additives all played positive roles in the process of aerobic composting, and the experimental groups outperformed the control groups without any additives. For discussion, the microbial inoculant promoted rapid pile body heating more than the recovery materials alone, and the effects on aerobic composting were related to the organic matter of substrates and biochar. After being composted, all the materials were satisfactorily decomposed. Degradation of additives into humic acid might serve as electron shuttles to promote thorough organic matter decomposition. These results provide a scientific basis data for industrial composting of organic solid waste processed by on-site stacking, and provide a reference for researcher and practitioners for studying the applications of microbial inoculant on aerobic composting.

Keywords: aerobic composting; cow manure; microbial inoculant; organic fertilizer additives; pile composting.

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Conflict of interest statement

LJ was employed by Binzhou Jingyang Biological Fertilizer Co., Ltd. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

FIGURE 1
FIGURE 1
Changes of physicochemical properties during the aerobic composting progress [(A) temperature; (B) moisture content; (C) pH values; (D) electrical conductivity (EC) values; (E) NH4+-N values]. Group 1: cow manure + additives, contrast; Group 2: cow manure + additives + microbial inoculant; Group 3: cow manure + additives + microbial inoculant + calcium superphosphate; Group 4: cow manure + additives + microbial inoculant + calcium superphosphate + biochar; Group 5: cow manure + rice husk + microbial inoculant + calcium superphosphate + biochar; Group 6: cow manure + sugar residue + microbial inoculant + calcium superphosphate + biochar; Group 7: cow manure + tomato straw + microbial inoculant + calcium superphosphate + biochar.
FIGURE 2
FIGURE 2
Changes of organic matter mass fraction during the aerobic composting progress. The brief description of the symbols in the figures were similar with Figure 1.
FIGURE 3
FIGURE 3
Changes of humic acid during the aerobic composting progress. The brief description of the symbols in the figures were similar with Figure 1.
FIGURE 4
FIGURE 4
Changes of cation exchange capacity (CEC) during the aerobic composting progress. The brief description of the symbols in the figures were similar with Figure 1.
FIGURE 5
FIGURE 5
Changes of C/N ratio during the aerobic composting progress. The brief description of the symbols in the figures were similar with Figure 1.
FIGURE 6
FIGURE 6
Changes of fourier transform infrared spectrometry (FTIR) during the aerobic composting progress. The brief description of the symbols in the figures were similar with Figure 1.
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