?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=H&rft.au=Ssali%2C+H&rft.aulast=Ssali&rft.atitle=Initial+and+residual+effects+of+nitrogen+fertilizers+on+grain+yield+of+a+maize%2Fbean+intercrop+grown+on+a+Humic+Nitosol+and+the+fate+and+efficiency+of+the+applied+nitrogen+&rft.title=Fertilizer+Research&rft.issn=0167-1731&rft.date=1990&rft.volume=23&rft.pages=63-72&rft.issue=2&rft.genre=article