@INPROCEEDINGS {LAL:1977c, title = {Effect of method of seed bed preparation, mulching and time of planting on yam (Dioscorea rotundata) in Western Nigeria}, author = {Lal, R. and Hahn, S. K. }, booktitle = {Proceedings of the Third Symposium of the International Society for Tropical Root Crops held at IITA, Ibadan, Nigeria, 2-9 December, 1973, edited by C. L. A. Leakey}, year = {1977}, pages = {293--306}, publisher = {International Society for Tropical Root Crops (ISTRC); International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {RTB; Root and Tuber; Yam}, }