1. Alhassan, W. S., Ehoche, O. W., Adu, I. F. and Obilana, A. T. 1983.Crop residue potential of agricultural development projects. Chemical composition of crop residues60–62. Shika, Zaria, Nigeria: Ann. Rep. NAPRI, BU.
2. Allen, S. E., ed. 1974.Chemical analysis of Ecological Materials.252Oxford: Blackwell Scientific Publications.