F. N. Mbagwu and H. O. Edeoga
Journal of Agronomy 5 ( 4 ): 605 - 608 , 2006
F. N. Mbagwu, E. G. Chime and C. I.N. Unamba
Journal of Plant Sciences 3 ( 1 ): 126 - 129 , 2008
Pakistan Journal of Biological Sciences 9 ( 9 ): 1754 - 1758 , 2006