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

Lai Yao, Jie Zhu, Wei Yang, Dongzhu Zhao, Yong Zhou, Shaoqiu Li, Jiangwen Nie, Lixia Yi (), Zhangyong Liu and Bo Zhu
Additional contact information
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

Agriculture, 2024, vol. 14, issue 6, 1-15

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.

Keywords: CH 4; N 2 O; oilseed rape; substitution rate; C and N release (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2077-0472/14/6/839/pdf (application/pdf)
https://www.mdpi.com/2077-0472/14/6/839/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jagris:v:14:y:2024:i:6:p:839-:d:1403255

Access Statistics for this article

Agriculture is currently edited by Ms. Leda Xuan

More articles in Agriculture from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().