Composting faces challenges with nitrogen (N) losses through ammonia (NH 3 ) and nitrous oxide (N 2 O) emissions. In this study, wood vinegar (WV) and biochar (BC) were applied individually or combined into wheat straw and chicken manure composting. Results showed that BC and WV reduced NH 3 volatilizations by 22-23 % individually, but their combined application achieved a 59 % reduction. However, this combination increased N 2 O emissions by 174 %. The BC + WV treatment improved compost quality, evidenced by increased total N content by 22 % and enhanced the biological index, promoting additional dissolved organic matter production. Overall, BC and WV applications improved compost quality, reduced gaseous N losses, and supported the re-utilization of agricultural residues. The combined use of BC and WV significantly enhances compost quality and reduces NH 3 emissions, offering a promising solution for sustainable agricultural residue management.