@ARTICLE {JUO:1979a, title = {Effect of liming on the availability of three rock phosphate source in two west Africa ultisols}, author = {Juo, A. S. R. and Kang, B. T. }, journal = {Communications in Soil Science and Plant Analysis}, year = {1979}, volume = {10}, pages = {993--1003}, issn = {0010-3624}, }