The aim of this bachelor thesis was to study the procedures for study of dry-sieving soil aggregate stability and to verify the methodology of dry-sieving aggregates wetting on an experimental device designed for subsequent determination of water-stable soil aggregates. Laboratory procedures revealed high values of Ks (coefficient of structural stability of soils) indicating specific parameters of forest soils in the water management area of Teplá Valley (Ružomberok District). The separated dry-sieving soil aggregate fractions were subsequently subjected to dry water steam humidification in order to prepare these samples for subsequent study of water-stable soil aggregates. The functionality of the tested experimental equipment was confirmed and methodological procedures for its deployment in laboratory practice were verified.