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Application of Calcium Peroxide for Methane Mitigation in Paddy Fields: Effects of Milk Vetch ( Astragalus sinicus L.) Incorporation

Author

Listed:
  • Ying Wang

    (Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Founded by Anhui Province and Ministry of Education, School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China)

  • Zhengdong Su

    (Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Founded by Anhui Province and Ministry of Education, School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China)

  • Jiajia Wang

    (Anhui Provincial Key Laboratory of Nutrient Recycling, Resources and Environment, Institute of Soil and Fertilizer, Anhui Academy of Agricultural Sciences, Hefei 230031, China)

  • Tengfei Jiang

    (Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Founded by Anhui Province and Ministry of Education, School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China)

  • Nannan Zhou

    (Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-Founded by Anhui Province and Ministry of Education, School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China)

Abstract

Addressing the pressing issue of global warming, sustainable rice cultivation strategies are crucial. Milk vetch (MV), a common green manure in paddies, has been shown to increase CH 4 emissions, necessitating effective mitigation. This two-year field experiment assessed the impact of applying calcium peroxide (CaO 2 ), widely used in wastewater treatment and soil remediation due to its oxygen-releasing properties, on CH 4 emissions in conventional paddy fields (chemical fertilizer-only) and MV-incorporated fields. The results revealed that in conventional paddy fields, CaO 2 application significantly reduced the average CH 4 emissions by 19% without affecting rice yield. Compared with chemical fertilizer alone, MV incorporation increased the average rice yield by 12% but significantly elevated CH 4 emissions. However, in paddy fields with MV incorporation, CaO 2 application significantly reduced CH 4 emissions by 19% while preserving the yield benefits of MV. Soil analyses indicated that MV incorporation led to increased soil carbon content and increased mcrA and pmoA gene copy numbers, with elevated mcrA gene copy numbers being primarily responsible for the promoted CH 4 emissions. CaO 2 application improved the soil redox potential, reducing mcrA gene copies and consequently mitigating CH 4 emissions. Overall, CaO 2 application can contribute to global efforts to reduce CH 4 emissions while supporting rice productivity.

Suggested Citation

  • Ying Wang & Zhengdong Su & Jiajia Wang & Tengfei Jiang & Nannan Zhou, 2025. "Application of Calcium Peroxide for Methane Mitigation in Paddy Fields: Effects of Milk Vetch ( Astragalus sinicus L.) Incorporation," Agriculture, MDPI, vol. 15(5), pages 1-15, February.
    • Handle: RePEc:gam:jagris:v:15:y:2025:i:5:p:520-:d:1601768
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    References listed on IDEAS

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    1. Talha Javed & Irfan Afzal & Rosario Paolo Mauro, 2021. "Seed Coating in Direct Seeded Rice: An Innovative and Sustainable Approach to Enhance Grain Yield and Weed Management under Submerged Conditions," Sustainability, MDPI, vol. 13(4), pages 1-13, February.
    2. Sriphirom, Patikorn & Rossopa, Benjamas, 2023. "Assessment of greenhouse gas mitigation from rice cultivation using alternate wetting and drying and rice straw biochar in Thailand," Agricultural Water Management, Elsevier, vol. 290(C).
    3. Beining Lei & Juan Wang & Huaiying Yao, 2022. "Ecological and Environmental Benefits of Planting Green Manure in Paddy Fields," Agriculture, MDPI, vol. 12(2), pages 1-15, February.
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