?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=T&rft.au=Yoneyama%2C+T&rft.aulast=Yoneyama&rft.atitle=Nitrogen+accumulation+in+three+legumes+and+two+cereals+with+emphasis+on+estimation+of+N2+fixation+in+the+legumes+by+the+natural15+N-abundance+technique&rft.title=Biology+and+Fertility+of+Soils&rft.issn=0178-2762&rft.date=1990&rft.volume=9&rft.pages=25-30&rft.issue=1&rft.genre=article