Upon studying the surface samples and samples for B2 horizon of soils with an argillic or latosolic B horizon, it was stated that in either case the relationship between pH and the base saturation degree was highly significant. However, the calculated regression equations were different and showed that, at the same base saturation degree, pH is higher for the B2 horizon of the latosols and lower for the B2 horizon of the soils with an argillic B horizon; for surface samples, the pH values were intermediate.