BACKGROUND: Weathering of bottom ash (BA) might induce change of its surface texture and pH when it is applied to the arable soil and affect physical and chemical properties of soil associated with greenhouse gas emission. This study was conducted to determine effect of weathering of BA in mitigating emission of greenhouse gases from upland soil.
METHODS AND RESULTS: In a field experiment, methane (CH4), carbon dioxide (CO2), and nitrous oxide (N2O) emitted from the soil was periodically monitored using closed chamber. Three month-weathered BA and non-weathered BA were applied to an upland soil at the rates of 0, 200 Mg ha-1. Maize (Zea mays L.) was grown from July 1st to Oct 8th in 2018. Both BAs did not affect cumulative CH4 emission. Cumulative CO2 emission were 23.1, 19.8, and 18.8 Mg/ha/100days and cumulative N2O emission were 35.8, 20.9, and 17.7 kg/ha/100days for the control, non-weathered BA, and weathered BA, respectively. Weathering of BA did not decrease emission of greenhouse gases in this study. Both BAs did not decrease biomass yields of maize.
CONCLUSION: BA might be a good soil amendment to mitigate emissions of CO2 and N2O from arable soil without adverse effect on crop productivity.