The study looked at how adding coconut chaff biochar to rice fields affects greenhouse gas emissions. They tested different amounts of biochar with nitrogen fertilizer and measured nitrous oxide (N2O) and methane (CH4) emissions. The results showed that biochar reduced N2O emissions by 18%-43%, with the highest reduction seen with 40 t ·hm-2 of biochar. For CH4 emissions, biochar decreased emissions by 28%-71% in the early rice season. However, in the late rice season, biochar increased CH4 emissions by 52%-176%. Overall, adding biochar to the soil can help reduce harmful greenhouse gas emissions from paddy fields.