The phenomenon of phosphate adsorption is, by its own nature, closely related to the mineral composition of the soils, particularly to the fine fraction. Therefore, in a paper on this subject, it is very important to have the correct characterization of the mineral components of the soils and complete understanding and use of the mineralogical concepts involved. And, finally, it is essential that the citations of previous papers in the field be accurate. This was not quite the case for the paper published by Agbenin and Tiessen in the January 1994 Issue ofSoil Science.