?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=W+B&rft.au=Hoogmoed%2C+W+B&rft.aulast=Hoogmoed&rft.atitle=Soil+management+for+crop+production+in+the+West+African+Sahel.+I.+Soil+and+climate+parameters&rft.title=Soil+%26+Tillage+Research&rft.issn=0167-1987&rft.date=1990&rft.volume=16&rft.pages=85-103&rft.issue=1-2&rft.genre=article