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| Effects of straw-decomposing microorganism inoculum and C/N ratio on field rice straw composting |
| Received:October 31, 2022 Revised:March 08, 2023 |
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| KeyWord:straw-decomposing microorganism inoculum;C/N ratio;straw-composting in the field;decomposition rate;chemical composition;enzyme activity;bacterial community diversity |
| Author Name | Affiliation | E-mail | | YIN Zhong | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | WANG Xin | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | LU Mengxing | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | WEI Zhengyu | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | WANG Shicong | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | MA Chao | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | chaoma@ahau.edu.cn |
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| Abstract: |
| A two-factor, three-level factorial design was used in this study to assess the effects of straw-decomposing microorganism inoculum and C/N ratio on the composting characteristics of straw in the field. The experimental design included two types of strawdecomposing microorganism inocula(i.e., Bacillus amyloliquefaciens SQR9 and Cellulosimicrobium cellulans MC29) and three levels of C/N ratio(i.e., 15:1, 25:1, and 35:1). Rice straw was used as raw materials to investigate their effects on decomposition rate, chemical composition, enzymatic activity, and bacterial community diversity after 7 and 120 days of composting, respectively. The results were described as follows:Following 7 days of composting, varying C/N ratios significantly affected the degree of decomposition of straw residues (P＜0.05); meanwhile, a C/N ratio of 25:1 resulted in the highest degree of decomposition, independent of the type of microorganism inocula. After 120 days of composting, different straw-decomposing microorganism inocula and C/N ratios significantly affected the decomposition rate(P＜0.05). The optimal C/N ratio for MC29 was ascertained to be 25:1, at which point the decomposition rate of straw rose considerably(P＜0.05). Additionally, after 120 days of composting, different straw-decomposing microorganism inoculum and C/N ratios induced significant effects on cellulase activity, with the former having pronounced effects on lignin peroxidase activity. Furthermore, the C/N ratio had remarkable effects on the abundance and diversity of the bacterial community after 120 days of composting, which generally showed an upward trend with the increase in the C/N ratio. In conclusion, straw-decomposing microorganism inoculum and C/N ratio can influence the composting characteristics of rice straw in the field. MC29 had more substantial effects than SQR9, and its optimal C/N ratio was 25:1. The straw-decomposing microorganism inoculum significantly affected cellulase and lignin peroxidase activities, and the C/N ratio had a significant effect on the cellulase activity and bacterial community diversity. This study would contribute to the development of straw composting technology and the utilization of the straw return effect. |
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