?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Tobita%2C+S&rft.aufirst=S&rft.aulast=Tobita&rft.issn=0178-2762&rft.pages=241-248&rft.atitle=Field+evaluation+of+nitrogen+fixation+and+use+of+nitrogen+fertilizer+by+sorghum%2Fpigeonpea+intercropping+on+an+Alfisol+in+the+Indian+semi-arid+tropics&rft.volume=17&rft.issue=4&rft.title=Biology+and+Fertility+of+Soils&rft.date=1994&rft.genre=article