?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Ntare%2C+B+R&rft.aufirst=B+R&rft.aulast=Ntare&rft.issn=1573-0867&rft.pages=143-147&rft.atitle=Effects+of+phosphorus+on+yield+of+cowpea+cultivars+intercropped+with+pearl+millet+on+Psammentic+paleustalf+in+Niger&rft.volume=32&rft.issue=2&rft.title=Nutrient+Cycling+in+Agroecosystems&rft.date=1992&rft.genre=article