@ARTICLE {YUSUF:2011, title = {Residual effect of long term application of organic and mineral fertilizers on selected chemical properties of a savanna Alfisol}, author = {Yusuf, A. A. * and Abaidoo, R. }, journal = {Journal of Agricultural Science and Technology A}, year = {2011}, month = {May}, volume = {1}, number = {1A}, pages = {106--110}, issn = {2161-6256}, url = {http://davidpublishing.org/journals/j1/Journal_of_Agricultural_Science_and_Technology/Agricultural2011/379.html}, }