• Straw biochar improved water-soluble nutrient ions contents during composting.
• Straw biochar enhanced the degradation of organic matter and maturity.
• The product with biochar addition became mature after composting for 42 days.
• A final concentration of 10–15% straw biochar was optimal.
Authors: Jining Zhang, Guifa Chen, Huifeng Sun, Sheng Zhou*, Guoyan Zou
Journal: Bioresource Technology, 200:876-883 (2016)