Abstract
Rice cultivation is a major source of methane (CH4) emissions. Intermittent irrigation systems in rice cultivation, such as the mid-season drainage (MSD), are effective strategies to mitigate CH4 emissions during the growing season, though the reduction rates are variable and dependent on the crop context. Aeration periods induce alteration of soil CH4 dynamics that can be prolonged after flooding recovery. However, whether these changes persist beyond the growing season remains underexplored. A field experiment was conducted in Spain to study the effect of MSD implemented during the rice growing season on greenhouse gas (GHG) emissions in relation to the standard permanently flooded water management (PFL). Specifically, the study aimed at (1) assessing the CH4 mitigation capacity of MSD in the studied area and (2) testing the hypothesis that the mitigating effect of MSD can be extended into the following winter flooded fallow season. Year-round GHG sampling was conducted, seasonal and annual cumulative emissions of CH4 and N2O as well as the global warming potential were calculated, and grain yield was measured. MSD reduced growing season CH4 emissions by ca. 80% without yield penalties. During the flooded fallow season, MSD reduced CH4 emissions by ca. 60%, despite both fields being permanently flooded. The novelty of our observations lies in the amplified mitigation capacity of MSD by extending the CH4 mitigation effect to the following flooded winter fallow season. This finding becomes especially relevant in rice systems with flooded winter fallow season given the large contribution of this season to the annual CH4 emissions.
Data availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors acknowledge the support of the CERCA Programme/Generalitat de Catalunya. The technical support of the rice growing company Instituto Hispánico del Arroz S.A. (HISPARROZ) is also acknowledged.
Funding
This work has been supported and funded by Mars Food, Herba Ricemills (Ebro Foods) and Danone Specialized Nutrition in the frame of the ORYZONTE project.
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Martínez-Eixarch, M., Beltrán-Miralles, M., Guéry, S. et al. Extended methane mitigation capacity of a mid-season drainage beyond the rice growing season: a case in Spain. Environ Monit Assess 194, 648 (2022). https://doi.org/10.1007/s10661-022-10334-y
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DOI: https://doi.org/10.1007/s10661-022-10334-y