Redox chemical analysis of methane emission from rice paddies irrigated with nanobubble water

2015 Fiscal Year Final Research Report

• Project/Area Number: 25850236
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Environmental agriculture(including landscape science)
• Research Institution: National Institute for Agro-Environmental Sciences
• Principal Investigator: Minamikawa Kazunori 国立研究開発法人 農業環境技術研究所, その他部局等, 研究員 (60601151)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: ナノバブル / 温室効果ガス / メタン / 土壌酸化還元状態 / 水田

Outline of Final Research Achievements

Methane is the second important greenhouse gas after carbon dioxide. Methane is produced in a flooded paddy soil by anaerobic methanogenic archaea. Nanobubbles are fine bubbles less than 10^-6 m in diameter. Nanobubbles have several unique properties, including a long lifetime in water.
We hypothesized that irrigation with nanobubble water made of pure oxygen can reduce methane emission from a flooded paddy soil, and demostrated it from a pot experiment. Cumulative methane emission was significantly (p <0.05) reduced by oxygen-nanobubble water compared to control water by 21%.

Free Research Field

環境農学