“…Upper humic-cumulose horizons, 7-12 cm thick, produce humus with high concentration of water soluble violent separates. Structural groups of brown ulminic and fulvic acid, representing 58-88% of the total composition, react even at temperatures lower than 15°C [14,19]. Soils have acidic reaction of the environment (pH w 3.9-5.8), their profile is enriched with iron and manganese oxides, and their soluble forms represent 35-45% of the total composition.…”