About KOYAMA YUTAKA
About 千葉県農業総研セ
About 関東雑草研究会報
About paddy field
About Equisetaceae
About weed
About paddy rice
About cultivation management
About impounding
About puddling
About non-plowing culture
About cultivation by direct seeding
About イヌスギナ
About direct seeding cultivation on dry paddy field
About Rice cropping
About Plant damage caused by weeds
About Plant ecology
About 水田
About イヌ
About スギナ
About 栽培管理