S.U.O. Onyeagocha, N.C. Ehirim, C.A. Emenyonu, C.S. Onyemauwa, F.O. Nwosu, D.O. Ohajianya, C.C. Eze, G.A. Anyanwu, N.N.O. Oguoma and B.O. Esonu
Agricultural Journal 5 ( 2 ): 37 - 44 , 2010