Carbon input management in temperate rice paddies: Implications for methane emissions and crop response

Agriculture contributes to over 20% of global anthropogenic greenhouse gas emissions and irrigated paddy fields account for 5-10% of CH4 emissions. Main organic input providing methano-genesis substrate is straw. We hypothesized that removing rice straw can mitigate CH4 emissions, and that replacing its carbon (C) input with raw or solid digestate can be a valuable alternative both for crop, soil and emission responses. A mesocosm study was setup to follow crop growth, changes in soil pore water chemistry (dissolved Fe(II) and dissolved Organic C), and CH4 emissions over one cropping season on soil treated with the combination of two straw managements (removal or incorporation) and three fer-tilizations (mineral, raw digestate, solid digestate). Soils not receiving straw on average emitted 38 % less than soils after straw incorporation, while the two organic fertilizers did not increase emissions with respect to mineral N application. Furthermore, straw incorporation induced a yield depression independently from the fertilization strategy, probably as a result of N immobi-lization, especially in early stages. This was evidenced by early SPAD observations and flag leaf length, and both grain and straw final production. Moreover, the two organic fertilizers were not fully able to sustain crop N requirements with respect to the min-eral fertilizer. Straw management was therefore decisive for deter-mining both rice yield and CH4 emissions, while the impact of fertilization treatments was crucial only for crop productivity.