The studies were carried out on material representing 13 different soil profiles from various regions of Poland. The content of total iron in 6 granulometric fractions of soils derived from various parent material showed high variation. The most varied with respect to the content of iron are the clay fractions, and the least are silt and sand fractions. The richest in total iron are fractions occurring in smallest amounts, and the poorest are those which dominate in granulometric composition.
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