Evolution of humus dynamics in composting of swine manure combined with wood vinegar

Abstract

Abstract Aerobic composting was carried out in a greenhouse using home-made compost bins, and the changes in humus(HS) composition of composted manure with different proportions of wood vinegar(WV) added to pig manure and rice straw as raw materials were studied. Since the temperature, water content and pH were very different from those of the summer compost, they were used as basic evaluation indices of compost maturity. Rice straw(RS) and Swine manure (SM) were used as test materials, and the water-soluble carbon (CWSS), extractable humic carbon (CHE), humic carbon (CHA), humic carbon (CFA) and humic carbon (CHU) of the materials were investigated, and the humus decomposition coefficients were dynamically analyzed. The findings demonstrated that 1.25% and 1.75% wood vinegar affect humification. Meanwhile, the results of Ratio of absorbance of water-soluble organic substances at 465 and 665 under UV spectrophotometer (E4/E6) indicated that the aromatic ring of 1.75% WV solution was more stable after condensation, and the decomposition of hominin as a HS stabilizing component was more complete at the concentration of 1.75%. Consequently, this study revealed that WV at a concentration of 1.75% was more efficient in stimulating pile decomposition in cold conditions.