Plinthite in a Btv horizon from a Fuquay soil
Plinthite (Gr. plinthos, brick) is an iron-rich, humus-poor mixture of clay with quartz and other highly weathered minerals. It commonly occurs as reddish redox concentrations in a layer that has a polygonal (irregular), platy (lenticular), or reticulate (blocky) pattern. Plinthite irreversibly hardens upon exposure to repeated wetting and drying, especially if exposed to heat from the sun. Other morphologically similar iron-rich materials that do not progressively harden upon repeated wetting and drying are not considered plinthite. The horizon in which plinthite occurs commonly has 2.5 percent (by mass) or more citrate dithionite extractable iron in the fine-earth fraction and a ratio between acid oxalate extractable Fe and citrate-dithionite extractable Fe of less than 0.10.
For more information about describing soils, visit:
www.nrcs.usda.gov/resources/guides-and-instructions/field...
For additional information about soil classification using Soil Taxonomy, visit:
www.nrcs.usda.gov/resources/guides-and-instructions/keys-...
For more information about a plinthic horizon, visit;
www.researchgate.net/publication/242649722_Rationale_for_...
or:
www.sciencedirect.com/science/article/pii/S00167061220043...
For more information about Slake Tests, visit:
www.nrcs.usda.gov/sites/default/files/2023-01/SSIR51.pdf
Soil Survey Field and Laboratory Methods Manual; Soil Survey Investigations Report No. 51, Version 2; Issued 2014 (pp. 148-157)
3.7 Soil Stability, Dispersion, and Slaking
3.7.5 Slaking (Disaggregation) for Identification and Semiquantification of Cemented Materials
John Kelley and Michael A. Wilson, United States Department of Agriculture, Natural Resources Conservation
Service, Soil Survey Staff
Plinthite in a Btv horizon from a Fuquay soil
Plinthite (Gr. plinthos, brick) is an iron-rich, humus-poor mixture of clay with quartz and other highly weathered minerals. It commonly occurs as reddish redox concentrations in a layer that has a polygonal (irregular), platy (lenticular), or reticulate (blocky) pattern. Plinthite irreversibly hardens upon exposure to repeated wetting and drying, especially if exposed to heat from the sun. Other morphologically similar iron-rich materials that do not progressively harden upon repeated wetting and drying are not considered plinthite. The horizon in which plinthite occurs commonly has 2.5 percent (by mass) or more citrate dithionite extractable iron in the fine-earth fraction and a ratio between acid oxalate extractable Fe and citrate-dithionite extractable Fe of less than 0.10.
For more information about describing soils, visit:
www.nrcs.usda.gov/resources/guides-and-instructions/field...
For additional information about soil classification using Soil Taxonomy, visit:
www.nrcs.usda.gov/resources/guides-and-instructions/keys-...
For more information about a plinthic horizon, visit;
www.researchgate.net/publication/242649722_Rationale_for_...
or:
www.sciencedirect.com/science/article/pii/S00167061220043...
For more information about Slake Tests, visit:
www.nrcs.usda.gov/sites/default/files/2023-01/SSIR51.pdf
Soil Survey Field and Laboratory Methods Manual; Soil Survey Investigations Report No. 51, Version 2; Issued 2014 (pp. 148-157)
3.7 Soil Stability, Dispersion, and Slaking
3.7.5 Slaking (Disaggregation) for Identification and Semiquantification of Cemented Materials
John Kelley and Michael A. Wilson, United States Department of Agriculture, Natural Resources Conservation
Service, Soil Survey Staff