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BACKGROUND: Carbonized biomass is a carbon-rich solid product obtained by the pyrolysis of biomass. It has been suggested to mitigate climate change through increased carbon storage and reduction of greenhouse gas emission. The objective of this studywas to evaluate carbon dioxide (CO2) and nitrous oxide (N2O) emissions from soil after carbonized biomass addition. METHODSANDRESULTS:The carbonized biomasswas made froma pyrolyzer, which a reactorwas operated about 400~500 for 5 hours. The treatments were consisted of a °C control without input of carbonized biomass and two levels of carbonized biomass inputs as 6.06 Mg/ha for CB-1 and 12.12 Mg/ha for CB-2. Emissions of CO2 and N2O from orchard soil were determined using closed chamber for 13 weeks at 25 of incubation temperature. It was shown that °C the cumulativeCO2were 209.4 gCO2/m for CB-1, 206.4 g CO2/m for CB-2 and 214.5 g CO2/m for the control after experimental periods. The cumulative CO2 emission was similar in carbonized biomass input treatment compared to the control. It was appeared that cumulativeN2Oemissions were 4,478 mg N2O/m for control, 3,227 mg N2O/m for CB-1 and 2,324 mg N2O/m for CB-2 at the end of experiment. CumulativeN2Oemissioncontents significantly decreased with increasing the carbonized biomass input. CONCLUSION: Consequently the carbonized biomass frombyproducts such as pear branch residue could suppress the soil N2Oemission. The results from the study imply that carbonized biomass can be utilized to reduce greenhouse gas emission from the orchard field.

Decreases Nitrous Oxide Emission and Increase Soil Carbon via Carbonized Biomass Application of Orchard Soil