?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=A+M&rft.au=Abikar%2C+A+M&rft.aulast=Abikar&rft.inst=Andhra+Pradesh+Agricultural+University&rft.date=1985&rft.title=Evaluation+of+different+cropping+systems+on+shallow+black+soils+in+Semi-Arid+India+&rft.tpages=107&rft.degree=Masters