In peat-muck soils of the upper Liwiec River valley (from the locality of Sobicze 52^o06’N and 22^o38’E to the locality of Żytnia 52^o12’N and 22^o13’E), total contents of iron, aluminium and manganese showed a great spatial and profile variation. Chemical analyses revealed that mean contents of these elements can be arranged in the following decreasing series for muck layers (Mt) and peat layers (Otni): Fe > Al > Mn; for mineral subsoil (D): Al > Fe > Mn. The enrichment of muck layers of the peat-muck soils in the elements analysed resulted from organic matter becoming muck and from the precipitation of iron, aluminium and manganese compounds in the aeration zone as a result of capillary rise of soil moisture of the groundwater. Due to the agricultural character of the research area, the degree of anthropopressure should be considered low.

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