ИСТИНА

The composition and distribution of iron compounds forms in the profiles of agrogray soils (Greyzemic Phaeozems) of the Bryansk opolye reflect their polygenicity. The second humus horizons of the studied soils are characterized by high content of all forms of iron, high values of magnetic susceptibility, high values of the iron/silt ratio, and high values of the specific surface, especially internal, diagnosing the daily nature of the second humus horizons in the past. A new van Bodegom criterion has been tested and its values are consistent with the values of the Schwertmann criterion.