@ARTICLE {OIKEH:1999, title = {Growth and distribution of maize roots under nitrogen fertilization in plinthite soil}, author = {Oikeh, S. and Kling, J. and Horst, W. J. and Chude, V. * and Carsky, R. }, journal = {Field Crops Research}, year = {1999}, volume = {62}, pages = {1--13}, }