Humification and Quality Improvement of Compost Using Spent Mushroom Waste Derived Biochars

• Main Authors: Li,Jhen-yu, 李鎮宇
• Other Authors: Liou,Rey-May
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/qy86a6

碩士 === 嘉南藥理大學 === 環境工程與科學系 === 106 === Biochar with porous, hydrophobic and low density properties could provide macropore for microbial growth in soils. As large development of mushroom industry, the utilization of agricultural waste resources had attracted great attention. In this study, various types of biochars made from various SMW (mushroom, oyster mushroom and coral mushroom) with various pyrolysis temperature (300, 500 and 850℃). Furthermore, several composts were prepared from various mixing ratio of pig manure, mushroom wastes and biochars in aerobic composting treatments. The results were used to evaluate effect of biochar addition on humification and quality of compost and their application for plant growth. The biochars pyrolysed in 800℃ presented higher pH, electric conductivity, C/N ratio and BET areas. During the composting reaction, the pH and organic matter contents of composts with various biochar amendment presented no obvious differences. Composts with higher biochar addition (10%) retained low EC vaules. During the composting process, small molecules were synthesized to form stable macromolecules during composting. E4/E6 values with biochar addition were lower than non-additive case during composting. In the late stage of composting, organic compostions of materials formed to humus substances gradually and the alphatic groups disappeared by FTIR spectrum. It was indicated that biochar addition enhanced the humification and quality of compost. In the seed germination, water extractable (compost:water, 1:5) solutions of all compost products showed good germination rate. Comparison of effects of biochar composts on plant growth was taken in pot experiment of Brassica chinensis Linn with amendment of chemical ferlizer as control. Higher pH and OM contents were observed in the amendment of biochar compost than control. The best performance of plant growth which amended with 10% M500 biochar compost was observed. It was indicated that proper reuse of agricultural waste could improve soil environment and had a valuable application potential for plants harvest.