Greenhouse Gas Emissions from Paddy Fields with Different Organic Matter Application Rates and Water Management Practices

Abstract

Global warming associated with emissions of greenhouse gases (GHGs) is one of the most important environmental issues because its potential to impact on human life is severe. In this study, we investigated the effect of organic matter applications and water management on the fluxes of GHGs and yields of rice from paddy fields, a major source of anthropogenic CH4 emissions. We found that the treatment effects on fluxes of GHGs differed among the gases and that the treatments affected rice yields. High CH4 fluxes and high rice yields were associated with organic matter amendments. CH4 gas fluxes were high during summer season especially in manure compost plot. Maintaining low water levels resulted in low rice yields and low emissions of CH4. CO2 is sunk into the soil through rice crop during daytime under any water management in this experiment.