Loam soil and clay soil predominate in 56% of the particle size metric composition of parent rocks, followed by loams, sandy clays, loamy sands, clays, etc.
The soil of 42% of the total area contains an alluvial-diluvial clay structure and about 14% of the area contains loessoidal clays. Alluvial sediments constitute up to 14% of the area, and the neogenic parent rocks constitute up 5% of the area.