?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=S+A&rft.au=El-Swaify%2C+S+A&rft.aulast=El-Swaify&rft.issn=0176-9340&rft.date=1985&rft.title=Soil+management+for+optimized+productivity+under+rainfed+conditions+in+the+semi-arid+tropics&rft.btitle=Advance+in+Soil+Science&rft.genre=bookitem