Аннотация:The composition and distribution of iron compounds forms in the profiles ofagrogray soils (Greyzemic Phaeozems) of the Bryansk opolye reflect their polygenicity.The second humus horizons of the studied soils are characterized by high content of allforms 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 ofthe second humus horizons in the past. A new van Bodegom criterion has been testedand its values are consistent with the values of the Schwertmann criterion.