Modelling greenhouse gas emissions and mitigation potentials in fertilized paddy rice fields in Bangladesh

• DOI: 10.1016/j.geoderma.2019.01.047
• Publication Date: 2019-02-01T23:10:34Z
• Authors: Khadiza Begum; Matthias Kuhnert; Jagadeesh B. Yelu...; Stephen M. Ogle; William J. Parton; Stephen A. Williams; Genxing Pan; Kun Cheng; Muhammad A. Ali; Pete Smith
• Keywords: Paddy field; Nitrous oxide; Manure management

Abstract Emissions of greenhouse gases (GHG) from paddy rice are significant, so reducing these emissions has significant potential for climate change mitigation. We investigated alternate wetting and drying (AWD) as part of an integrated management approach to enhance mitigation, together with combinations of mineral nitrogen (N), reduced tillage, a suitable combination of plant residues and well decomposed manure. To quantify GHG emissions, and the potential for mitigation without yield decline, a process-based model, DayCent was used to simulate methane (CH4) and nitrous oxide (N2O) emissions from paddy rice (Oryza sativa L.) in Bangladesh. The four test sites selected were amended with mineral N fertilizer or an organic amendment (rice straw). A good agreement (p