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Agricultural practices to improve soil carbon sequestration in rice paddy soils

Code: 9781801465502
Hyeon Ji Song and Pil Joo Kim, Gyeongsang National University, South Korea

Chapter synopsis: Paddy rice systems are characterized by waterlogged conditions with high potential for CH4 emissions and soil organic carbon (SOC) sequestration. Therefore, it is necessary to evaluate the net global warming potential (GWP) of soil management considering SOC stock changes, and CH4 and N2O fluxes. Green manure application and straw retention slightly enhanced SOC stock, but highly increased net GWP due to high CH4 emissions. Aerobic pre-digestion of organic matter amended soils and water drainage during cropping are practices which significantly decrease net GWP. Moreover, silicate fertilizers with electron acceptors like oxidized iron and manganese also decrease net GWP. Biochar rather than compost as a stable organic amendment significantly increases SOC while decreasing net GWP. In conclusion, the combined management of organic amendments, aerobic pre-digestion, water drainage, and fertilizers could be a promising way to mitigate greenhouse gas emissions and favor C sequestration in rice paddies.

DOI: 10.19103/AS.2022.0106.16

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Table of contents 1 Introduction 2 Carbon sequestration potential of rice paddy soils 3 Methane production, oxidation and emissions in rice paddy soils 4 Nitrous oxide emissions in rice paddy soils 5 Evaluation of the net global warming potential and greenhouse gas intensity of rice paddy soils 6 Effect of water management on global warming potential of rice paddy soils 7 Effect of green manure management on global warming potential of rice paddy soils 8 Effect of straw management on global warming potential of rice paddy soils 9 Effect of fertilizer management on global warming potential of rice paddy soils 10 Effect of soil amendments on global warming potential of rice paddy soils 11 Effect of biochar and compost addition on global warming potential of rice paddy soils 12 Conclusion 13 Acknowledgements 14 References

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