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Green Manuring with Oilseed Rape ( Brassica napus L.) Mitigates Methane (CH 4 ) and Nitrous Oxide (N 2 O) Emissions in a Rice-Ratooning System in Central China

Author

Listed:
  • Lai Yao

    (Hubei Collaborative Innovation Centre for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 434025, China)

  • Jie Zhu

    (Xiangyang Academy of Agricultural Sciences, Xiangyang 441057, China)

  • Wei Yang

    (Hubei Collaborative Innovation Centre for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 434025, China)

  • Dongzhu Zhao

    (Horticulture Workstation of Yongping County, Dali 672600, China)

  • Yong Zhou

    (College of Life Science and Technology, Hubei Engineering University, Xiaogan 432000, China)

  • Shaoqiu Li

    (Hubei Collaborative Innovation Centre for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 434025, China)

  • Jiangwen Nie

    (Hubei Collaborative Innovation Centre for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 434025, China)

  • Lixia Yi

    (Hubei Collaborative Innovation Centre for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 434025, China)

  • Zhangyong Liu

    (Hubei Collaborative Innovation Centre for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 434025, China)

  • Bo Zhu

    (Hubei Collaborative Innovation Centre for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 434025, China)

Abstract

The use of oilseed rape (OS, Brassica napus L.) as a winter green manure is crucial for enhancing soil fertility and reducing chemical N application in paddy fields. However, the impacts of replacing varying amounts of chemical N with OS on CH 4 and N 2 O emissions in paddy soils have not been well evaluated. In this study, GHG emissions, soil properties and OS decomposition in a rice-ratooning system with different OS-urea N replacement rates (0%, 25%, 50%, 75% and 100%) were investigated. Our results indicate that 84.7–90.7% of the initial C and 97.5–98.4% of the N were released during the 192-day decomposition process, and that the mineralization patterns of net C and net N in the OS residue were consistent with a single exponential decay model. The lowest CH 4 emissions (9.97 g m −2 ) were observed at 0% OS, while the highest N 2 O emissions (0.40 g m −2 ) were observed at this level of substitution. Conversely, the highest CH 4 emissions (20.71 g m −2 ) and lowest N 2 O emissions (0.07 g m −2 ) were observed at 100% OS. Compared to 0% substitution, 25% substitution significantly decreased GWP and GHGI without reducing rice grain yield. Environmental parameters such as soil redox, NH 4 + -N and residual N and C were shown to be significantly associated with CH 4 emissions, whereas soil redox, NH 4 + -N and residual C were the main drivers of N 2 O emissions. In conclusion, 25% substitution of OS was the most cost-effective measure for balancing greenhouse gas emission and rice yield.

Suggested Citation

  • Lai Yao & Jie Zhu & Wei Yang & Dongzhu Zhao & Yong Zhou & Shaoqiu Li & Jiangwen Nie & Lixia Yi & Zhangyong Liu & Bo Zhu, 2024. "Green Manuring with Oilseed Rape ( Brassica napus L.) Mitigates Methane (CH 4 ) and Nitrous Oxide (N 2 O) Emissions in a Rice-Ratooning System in Central China," Agriculture, MDPI, vol. 14(6), pages 1-15, May.
    • Handle: RePEc:gam:jagris:v:14:y:2024:i:6:p:839-:d:1403255
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    References listed on IDEAS

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    1. Kandasamy Senthilraja & Subramanian Venkatesan & Dhandayuthapani Udhaya Nandhini & Manickam Dhasarathan & Balasubramaniam Prabha & Kovilpillai Boomiraj & Shanmugam Mohan Kumar & Kulanthaivel Bhuvanesw, 2023. "Mitigating Methane Emission from the Rice Ecosystem through Organic Amendments," Agriculture, MDPI, vol. 13(5), pages 1-17, May.
    2. Ye, Sijing & Song, Changqing & Shen, Shi & Gao, Peichao & Cheng, Changxiu & Cheng, Feng & Wan, Changjun & Zhu, Dehai, 2020. "Spatial pattern of arable land-use intensity in China," Land Use Policy, Elsevier, vol. 99(C).
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