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2025 Vol.58, Issue 1 Preview Page

Review

Biochar effects on methane emission from rice paddy differ with nitrogen fertilization, organic inputs, and water management
Nuri Baek1†
,
Se-In Lee12†
,
Husna Israt Pia1
,
Seo-Woo Park3
,
Eun-Seo Shin3
,
Jiyu Lee4
,
Han-Yong Kim5
,
Woo-Jung Choi6*
1Doctoral Student, Department of Rural & Bio-systems Engineering (Brain Korea 21), Chonnam National University, Gwangju 61186, Korea
2Researcher, National Institute of Agricultural Sciences, Rural Development Administration, Wanju, Jeonbuk-do 55365, Korea
3Master Student, Department of Rural & Bio-systems Engineering (Brain Korea 21), Chonnam National University, Gwangju 61186, Korea
4Undergraduate Student, Department of Rural & Bio-systems Engineering (Brain Korea 21), Chonnam National University, Gwangju 61186, Korea
5Professor Department of Applied Plant Science, Chonnam National University, Gwangju 61186, Korea
6Professor, Department of Rural & Bio-systems Engineering (Brain Korea 21), Chonnam National University, Gwangju 61186, Korea
*Corresponding Author
†These authors contributed equally to this work.
28 February 2025. pp. 133-143
PDF XML Citation
Abstract

The effects of biochar (BC) on methane (CH4) emission may vary with nitrogen (N) fertilization rate, organic inputs, and water management. In this short review, we studied the changes in the direction and magnitude of CH4 emission by BC under these different conditions. Literature data indicated that co-application of BC with N fertilizer may increase or decrease CH4 emission depending on the N fertilization rates. Although the threshold N fertilization rate for the enhanced CH4 emission by BC is unclear, it was suggested that N fertilization may enhance BC-induced CH4 oxidation via the supply of N to methanotrophs. Although organic inputs stimulate CH4 emission, co-application of BC with organic inputs efficiently decreases CH4 emission by reducing C substrate availability for methanogens via sorption onto BC particles. The application of BC also enhances CH4 oxidation under water-saving irrigation to stimulate the methanotroph activity under aerobic conditions. Our study suggests that application of BC may be a measure to mitigate CH4 emission from paddy soils amended with organic inputs and it may further enhance CH4 oxidation under water-saving irrigation.

The direction and mechanisms of the changed CH4 emission by biochar with N fertilization, organic inputs, and water-saving irrigation.
Keywords
Methanogens
Methanotrophs
N fertilization rate
Rice straw
Water-saving irrigation
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Information
  • Publisher :Korean Society of Soil Science and Fertilizer
  • Publisher(Ko) :한국토양비료학회
  • Journal Title :Korean Journal of Soil Science and Fertilizer
  • Journal Title(Ko) :한국토양비료학회 학회지
  • Volume : 58
  • No :1
  • Pages :133-143
  • Received Date : 2025-01-03
  • Revised Date : 2025-01-22
  • Accepted Date : 2025-01-23
  • DOI :https://doi.org/10.7745/KJSSF.2025.58.1.133
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