@PROCEEDINGS {OKIGBO:1980, title = {Studies on potential uses of crop residues and some industrial by-products in soil management in the humid tropics}, author = {Okigbo, B. and Caveness, F. E. and Kang, B. T. and Lal, R. and Akobundu, I. }, booktitle = {Proceedings of the AAASA Workshop on Agricultural, Foresry and Fisheries Waste Products, Douala, Cameroon, 17-21 November, 1980}, year = {1980}, }