Effect of biochar application on co2 emission in relationship with soil physical properties

Biochar application to agriculture soil has been recommended as a strategy to reduce increasing atmospheric carbon dioxide (CO2) concentrations and mitigate climate change. Significant suppression of soil CO2 emissions following biochar amendments has been demonstrated in short-term laboratory incubations by several authors, yet evidence from long-term field trials has been contradictory. This study investigates whether biochar addition to the soil could suppress soil CO2 emission under field conditions after 6�th years following amendment. CO2 emissions were not significantly suppressed with biochar addition, although they were generally low. Biochar amendment suppressed soil cumulative CO2 emissions by 30.59%. These findings demonstrate that biochar amendment has the potential to suppress soil CO2 emissions in corn crop system after 6�th years of biochar application. We conclude that the concentration of soil CO2 emissions were depended on soil temperature measured during study period.