Effects of Rice Husk Charcoal Application on Rice Yield, Methane Emission, and Soil Carbon Sequestration in Andosol Paddy Soil

• KOYAMA Shinichi

  Graduate School of Life and Environmental Sciences, University of Tsukuba

• KATAGIRI Takuto

  Graduate School of Life and Environmental Sciences, University of Tsukuba

• MINAMIKAWA Kazunori

  Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization

• KATO Morio

  Faculty of Life and Environmental Sciences, University of Tsukuba

• HAYASHI Hisayoshi

  Faculty of Life and Environmental Sciences, University of Tsukuba

抄録

Biochar application is an effective option for promoting soil carbon sequestration. Rice husk charcoal (RC) produced from pyrolysis of rice husk (RH) is characterized by a higher silicon content as compared to wood-derived biochar. A study was conducted using pots to evaluate the short-term effects of RC application at 0, 0.4, 2.0, 4.0, 20.0, and 40.0 g pot^-1 (CONT, RC0.4, RC2, RC4, RC20, and RC40, respectively), or RH application at 4.0 g pot^-1 (RH4) on rice yield, methane (CH₄) emission, and soil carbon sequestration in an Andosol paddy soil. The results showed that the significant increase in brown rice yield with RC40 was attributed to increases in the grain number and percentage of ripened grains. Plants treated with RC20 or RC40 absorbed greater amounts of silicon than those treated with lower RC rates. RC application did not significantly increase CH₄ emission. The soil carbon content after rice cultivation increased in proportion to the RC application rate. The balance between cumulative CH₄ emission and soil carbon sequestration, based on the 100-year global warming potential, suggested that RC40 served as CO₂-equivalent sink. No differences were observed in the measured parameters between RH4 and RC4. These findings suggest that the higher rates of RC application in the RC20 and RC40 treatments function as a silicon fertilizer while promoting soil carbon sequestration.

収録刊行物

• Japan Agricultural Research Quarterly: JARQ

  Japan Agricultural Research Quarterly: JARQ 50 (4), 319-327, 2016

  国立研究開発法人　国際農林水産業研究センター

キーワード

• biochar
• C-N ratio
• global warming
• greenhouse gas emissions
• silicon

詳細情報

• CRID: 1390282679676899200
• NII論文ID: 130005269448
• DOI: 10.6090/jarq.50.319
• ISSN: 21858896
• ISSN: 00213551
• Web Site: https://www.jstage.jst.go.jp/article/jarq/50/4/50_319/_pdf
• 本文言語コード: en
• データソース種別:
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  • Crossref
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