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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-05-28 and was most recently seen on 2026-05-28.
Plinthosols are a reference soil group in the World Reference Base for Soil Resources (WRB), developed by the Food and Agriculture Organization (FAO). They are characterized by the presence of plinthite, petroplinthite, or pisoliths—concretions formed through pedogenic processes involving the accumulation of iron oxides. A key diagnostic feature of these soils is the plinthic horizon, which begins within 50 cm of the soil surface, or 100 cm if it lies beneath an albic horizon or a horizon with stagnic properties. Plinthosols typically form in tropical environments with alternating wet and dry conditions, where fluctuating water tables promote the transformation of iron and clay minerals. Plinthite, a red, clay-rich material, hardens irreversibly into ironstone when exposed to repeated moisture cycles. Though it may resemble a mineral when hardened, plinthite is a soil-forming (pedogenic) material rather than a true mineral.
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