著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL "Koyama, Takeo and Chammek, Chittana and Niamsrichand, Natee",Nitrogen application technology for tropical rice as determined by field experiments using [ 15]N tracer technique,,"Tropical Agriculture Research Center, Ministry of Agriculture and Forestry",1973,Technical bulletin of the Tropical Agriculture Research Center,,,,https://cir.nii.ac.jp/crid/1130282271135121408