SESQUIOXIDE SEGREGATION IN PLINTHIC AND NONPLINTHIC COUNTERPART SOILS

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Abstract
It is not known why plinthite has formed extensively in some soils but not in others with similar physical and chemical properties. Four plinthic soils and their nonplinthic counterparts were sampled for elemental analysis. Each plinthic soil had a higher content of iron and aluminum throughout the pedon than did its nonplinthic counterpart. Coastal Plain material 5 to 6 meters below the surface of plinthic soils contains more iron than material beneath nonplinthic soils, which suggests that parent material is important for plinthite formation. Ratios of iron to aluminum increase with depth in each pedon, and aluminum content is related to clay content. Data indicate that iron content of septaria > ironstone nodules > plinthite > high chroma mottles > low chroma mottles in the plinthic soils. It is not known why plinthite has formed extensively in some soils but not in others with similar physical and chemical properties. Four plinthic soils and their nonplinthic counterparts were sampled for elemental analysis. Each plinthic soil had a higher content of iron and aluminum throughout the pedon than did its nonplinthic counterpart. Coastal Plain material 5 to 6 meters below the surface of plinthic soils contains more iron than material beneath nonplinthic soils, which suggests that parent material is important for plinthite formation. Ratios of iron to aluminum increase with depth in each pedon, and aluminum content is related to clay content. Data indicate that iron content of septaria > ironstone nodules > plinthite > high chroma mottles > low chroma mottles in the plinthic soils. © Williams & Wilkins 1982. All Rights Reserved.

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