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| Matured compost recycling enhances the efficiency of composting and improves the quality of end-products during composting of herb residues |
| Received:June 24, 2019 |
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| KeyWord:composting;matured compost recycling;herb residue;compost quality;himic acids |
| Author Name | Affiliation | E-mail | | SONG Xiu-chao | Institute of Agricultural Resources and Environment, Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | GUO De-jie | Institute of Agricultural Resources and Environment, Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | MA Yan | Institute of Agricultural Resources and Environment, Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
School of Environmental and Safety Engineering, Jiangsu University, Zhenjiang 212013, China | myjaas@sina.com | | LUO Jia | Institute of Agricultural Resources and Environment, Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | WANG Guang-fei | Institute of Agricultural Resources and Environment, Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | LIU Xin-hong | Institute of Agricultural Resources and Environment, Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | |
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| Abstract: |
| Matured compost recycling is widely practiced to reduce the dosage of organic bulking agents used in actual composting processes and is therefore economically advantageous. In order to ascertain the effect of matured herb residue compost backflow on maturation efficiency of composting and quality of compost, this study discussed the transformation of nutrients as well as humus(composition, content, and quality)during the composting process. Two treatments were conducted to achieve this objective. The matured herb residue compost was used in composting in the proportion of 10% of initial raw materials(based on dry weight). A control treatment(CK)was also studied without application in industrial condition. During the experiment, the content of total carbon(TC), total humus(HS), free humus(FHS), water-soluble humus(WSHS), humic acid(HA), fulvic acid(FA), and some elements such as C, N, P, and S were determined. Results showed that matured compost amendment(MCT), wherein the thermophilic phase(55℃)was entered 20 days earlier than that in CK, could significantly accelerate the degradation of organic matter. When compared with CK, application of matured compost resulted in significant reduction in final TOC and C/N ratio(P<0.05), whereas, total N, total P, total K, and total S increased by 17.5%, 17.8%, 14.7%, and 9.4%, respectively. Moreover, MCT dramatically improved the activity of humus, as indicated by the increase in the content of HS, FHS, and WSHS in compost products. During the composting process, HA content increased and FA content decreased, resulting in increased HA/FA ratio, especially in the treatment with matured compost, indicating that MCT accelerated organic matter humification and improved the humus quality. Our results suggest that matured compost recycling could magnify the nutrient and humus quality during composting of agricultural organic wastes. |
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