@PROCEEDINGS {FRIESSEN:1978, title = {Lime-Phosphorus-Zinc Interactions in Two Nigerian Ultisols}, author = {Friessen, D. K and Juo, A. S. R. and Miller, M. G. }, booktitle = {Paper presented at the 11th Congress of International Soil Science Society, Edmonton, Canada. June 19 - 28, 1978}, year = {1978}, month = {June}, }