Plinthosols

 
Distribution of Plinthosols (FAO, GIS) (click to view larger picture)

Plinthosols

Plinthosols occur mainly in the moist tropical regions in low-lying positions where iron from the soil and adjacent uplands is accumulating.

Characteristics

Soils having either a petroplinthic horizon within 50 cm from the soil surface, or a plinthic horizon which either starts within 50 cm from the soil surface, or within 100 cm from the soil surface if it underlies an albic horizon or a horizon with stagnic properties.

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Iron accumulation in the form of plinthite below a strongly leached eluvial horizon; Brazil (Albi-Umbric Plinthosol)