In the humid conditions, the most common ground forms are the ferruginous ones: ferum
concretions, marsh ore, ocher spots, etc. Mollic gley soils are widely spread along the periphery of
marshes and are formed under the influence of mollic and gley processes on various soil-forming
rocks under conditions of sporadically pulsating water regime and excessive moisture under the
meadow and swamp biocenoses. The ferrum concretions are characteristic of all genetic horizons
of mollic gley soils, except for the soil-forming rock, and their content ranges from 3.3% in the
mollic to 47.1% in the lower transitional horizon. The gross iron content in the fine mollic gley
soils, as well as in the ferrum concretions forms, increases with depth, and the maximum values
are characteristic of the lower transition horizon. The lowest values of the gross iron content are
characteristic of the fine soil-forming rock (16.0 mg / 100 g soil) and the mollic soil (66.4 mg /
100 g soil). It was established that the gross chemical content of the ferrum concretions forms is
dominated by the iron oxides with the highest content in the ferrum concretions of the mollic soils
(48.75%). Also the ferrum concretions forms of iron are characterized by a rather high content of
aluminum oxides (5.59–7.92%). The highest values of the accumulation coefficient are character-
istic of the iron oxide (Kx = 7.21–2.58), which confirms the hypothesis of the dominant role of its
compounds in the formation of the ferrum concretions forms.
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