@ARTICLE {JAGTAP:1999e, title = {Long-term assessment of nitrogen and variety technologies on attainable maize yields in Nigeria using CERES-maize}, author = {Jagtap, S. and Abamu, F. J. * and Kling, J. }, journal = {Agricultural Systems}, year = {1999}, volume = {60}, pages = {77--86}, issn = {0308-521X}, }