In accordance with the new Romanian Taxonomy Soil System, there are two types of soil in the soil class Pellisol: Pellosol and Vertosol. Both of them are deep clayey soils (>45% and >30% clay) but in the Vertosol dominated clay minerals such as smectites, that expand upon wetting and shrink upon drying. Deep wide craks form when the soil dries out and swelling in the wet season, but in the Vertosol these phenomena are generalized and the slichensides have 10-60 0 inclination. The correlation with WRB-SR and USDA-ST is very difficult and also is the separation in the soil survey between Pellic Vertisils and Vertosols in Timiş County.

pellic; vertic; clay; shrinkage; swelling

Presentation: oral