Sulphate m o v e m e n t through two contrasting soils under various water regimes was studied in the laboratory. In both soils the downward m o v e m e n t of K2SO4 labelled with S a5 applied on the surface increased with increasing a m o u n t of water applied. However, in one soil of volcanic origin, Montreal sandy loam (an Andept, Inceptisol) with high organic m a t t e r content, most of the sulphate was retained in the top 15 cm even under 20 cm of applied water. I n the other soil, Montserrat clay (a Mollisol derived from glauconitic sandstone), with this a m o u n t of added water SO4 accumulated in the lower end of the column (45 cm) and some appeared in the leachate in spite of the high content of free Fe203 and A120~. Differences in the extent of sulphate movement in the two soils was accounted for by the differences in their properties which affect sulphate retention.