@INPROCEEDINGS {AJALA:2000, title = {Fertility requirement of open-pollinated and hybrid maize genotypes}, author = {Ajala, S. and Menkir, A. and Kling, J. }, booktitle = {Paper presented at: Sustainable maize production in Nigeria: The challenge in the coming millennium. Proceedings of the National Maize Workshop, 22-24 July 1999}, year = {2000}, publisher = {ABU, Zaria, Nigeria}, }