Analyses of organic acids and microorganisms of lowland soil related to the suppressive effect of rice bran on Monochoria vaginalis in organic rice production

Research Project

Project/Area Number	15H04446
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Research Field	Crop production science
Research Institution	National Agriculture and Food Research Organization
Principal Investigator	UCHINO Akira 国立研究開発法人農業・食品産業技術総合研究機構, 中央農業研究センター, 上級研究員 (20355316)
Co-Investigator(Kenkyū-buntansha)	浦嶋泰文国立研究開発法人農業・食品産業技術総合研究機構, 中央農業研究センター, 上級研究員 (90355610)
Research Collaborator	HAYAKAWA Hiroshi OHBA Hirosuke
Project Period (FY)	2015-04-01 – 2018-03-31
Project Status	Completed (Fiscal Year 2017)
Budget Amount *help	¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000) Fiscal Year 2017: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000) Fiscal Year 2016: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000) Fiscal Year 2015: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Keywords	有機農業 / 水田雑草 / 米ぬか / コナギ / 有機酸 / 土壌微生物 / 水稲有機栽培 / 雑草防除
Outline of Final Research Achievements	Organic acids and microorganisms of lowland soil were analyzed in order to elucidate the mechanism of suppressive effect of rice bran on Monochoria vaginalis in organic rice production. Outdoor experiments could not reveal the mechanism on the assumption of the effect of aromatic carboxylic acids. Therefore, laboratory experimental system simulating the suppressive effect of rice bran was established. The system revealed the essentiality of microorganisms and chemicals produced through the reaction of the microorganisms and rice bran. However, the microorganisms and chemicals could not be identified in the research period.