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| Effects of different humus enhancers on humification process of cattle manure compost |
| Received:March 04, 2025 |
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| KeyWord:Fe2(SO4)3;MnO2;humus enhancer;humification;infrared spectrum |
| Author Name | Affiliation | E-mail | | NIU Mingfen | Shenyang Jianzhu University Municipal and Environmental Engineering College, Shenyang 110161, China | | | GUO Wenjing | Shenyang Jianzhu University Municipal and Environmental Engineering College, Shenyang 110161, China | | | YUAN Lu | Tieling Ecological Environment Affairs Service Center, Tieling 112000, China | | | SONG Qiaobo | Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | | | HE Linke | Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | | | CHI Guangyu | Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | | | MA Jian | Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | mroger@163.com |
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| Abstract: |
| To investigate the effects of different humification enhancers on the humification process during composting of cattle manure and corn straw, Fe2（SO4）3 and MnO2 were respectively used as humification agents in aerobic composting experiments. Throughout the composting process, conventional parameters—including dry matter retention rate and nitrogen indices—as well as humification indices and microbial community structure were systematically monitored. The experimental results showed that the treatment group with added Fe2（SO4）3 achieved the highest dry matter retention rate and degree of humification. Compared with the control group and the MnO 2 treatment group, the content of humic acid increased by 11.7 g · kg-1 and 10.9 g · kg-1, respectively. The MnO2-treated group achieved the highest seed germination index（GI）, reaching 202%. The primary mechanism by which Fe2（SO4）3 enhanced humification of high-fiber compost materials was through the suppression of bacterial activity during the early composting phase, thereby promoting the transformation of fulvic acid into humic acid. In contrast, MnO2 enhanced microbial respiration by increasing the diversity of bacteria in the early stage and fungi in the later stage, which led to greater degradation and a subsequent reduction in dry matter retention. |
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