2010 Fiscal Year Final Research Report

Why Monochoria vaginalis is dominant in organic paddy fields?

Research Project

Project/Area Number	20580017
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Crop science/Weed science
Research Institution	National Agricultural Research Organization
Principal Investigator	HASEGAWA Hiroshi National Agricultural Research Organization, 東北農業研究センター・カバークロップ研究チーム, 主任研究員 (60355328)
Project Period (FY)	2008 – 2010
Keywords	有機栽培
Research Abstract	A paddy weed, Monochoria vaginalis, is dominant in organic paddy fields, and seed production was averaged 15,600 seeds/m^2. The seed production was estimated with the capsule number. We found buried seeds of Monochoria vaginalis did not have seasonality. A method was developed to separate Monochoria vaginalis seeds from sand and organic debris using Stokes' equation. The seeds of Monochoria vaginalis in soils tended to move upward after puddlings. The emergence of Monochoria vaginalis required 220℃・d after the first puddling, and the emerged Monochoria vaginalis was successfully buried with the succeeding puddlings. But, the number of Monochoria vaginalis buried was estimated as 2-4% of the seed bank.

(2 results)