期刊
BIORESOURCE TECHNOLOGY
卷 342, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125843
关键词
Combined composting; Fulvic acid; Microbial structure; Network; Biostimulants
资金
- Natural Science Foundation of China [42007005]
- National Key R&D Program of China [2018YFD0200600]
- Technology Integration and Demonstration Program of China (Henan Province) [2018YFD0300706]
- Henan Agricultural University Young Talents Fund [30500428]
The optimal concentration of fulvic acid at 100 mg/kg was found to be beneficial for promoting composting process by enriching specific beneficial microorganisms while decreasing pathogenic microorganisms. The presence of fulvic acid accelerated the progress of composting and improved overall microbial characteristics during the process.
The influence of different concentrations of fulvic acid at 0, 100, 200, and 400 mg/kg was evaluated during the course of composting with straw and mushroom residues as substrates. The optimal concentration of fulvic acid is 100 mg/Kg based on microbial characteristics, chemical parameters, and germination index testing. Nearly 80% of the microbial taxa responded significantly to fulvic acid over the composting period, with a dynamic change of the co-occurrence network from complex to simple and then to complex. Fulvic acid accelerated the progress of composting and reduced the emission of gases at the thermophilic phase. The optimal concentration of fulvic acid enriched the beneficial microorganisms Aeribacillus, Oceanobacillus, and Rhodospirillaceae, and decreased the abundances of pathogenic microorganisms Corynebacterium, Elizabethkingia, and Sarcocystidae. This study indicates a new strategy to optimize the composting process using the biostimulant fulvic acid.
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