Contribution of stubble to the root uptake of radiocesium by rice plants

Research Project

Project/Area Number	15K07344
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Plant nutrition/Soil science
Research Institution	National Institutes for Quantum and Radiological Science and Technology
Principal Investigator	Ishii Nobuyoshi 国立研究開発法人量子科学技術研究開発機構, 放射線医学総合研究所福島再生支援本部, 主幹研究員(定常) (50392212)
Co-Investigator(Kenkyū-buntansha)	田上恵子国立研究開発法人量子科学技術研究開発機構, 放射線医学総合研究所福島再生支援本部, チームリーダー (10236375)
Project Period (FY)	2015-04-01 – 2018-03-31
Project Status	Completed (Fiscal Year 2017)
Budget Amount *help	¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000) Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000) Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000) Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords	放射性セシウム / 刈り株 / 経根吸収 / 水稲 / 原子力発電所事故 / 福島第一原子力発電所事故 / イネ
Outline of Final Research Achievements	Transfer of Cs-137 from rice stubbles to rice plants was studied to elucidate the behavior of radiocesium in rice paddy fields. Rice stubbles were dried, powdered and then incorporated into paddy soil samples. The activity concentration of Cs-137 in the stubble was 383 Bq/kg-dry. Rice plants were harvested after 139 days of rice transplanting. Contaminations of Cs-137 in the harvested brown rice samples were under detection limit of 1.0 Bq/kg-dry. Results of this study suggested that the potential contribution of rice stubble to the transfer of radiocesium to rice plants is small.