Clay coated macropore in a Barnwell soil from Lee County, SC
Figure 3-27. Redoximorphic features that consist of a redox concentration, as an iron mass (reddish area along ped surface) and an iron depletion (light-colored area surrounding the root channel in ped interior). (Soil Survey Manual, USDA Handbook No. 18; issued March 2017).
For more information about the major principles and practices needed for making and using soil surveys and for assembling and using related soils data (Soil Survey Manual), visit:
www.nrcs.usda.gov/resources/guides-and-instructions/soil-...
Note the clay and finer soil particles coating the pore wall and fine root running the length of the pore. The lighter soil color along the exterior of the pore is formed by stripping of iron as water concentrates and moves downward carrying away iron in solution ("redoximorphic” process).
Redoximorphic features consist of color patterns in a soil that are caused by loss or gain of pigment compared to the matrix color, formed by oxidation/reduction of iron and/or manganese coupled with their removal, translocation, or accrual; or a soil matrix color controlled by the presence of iron. The composition and responsible formation processes for a soil color or color pattern must be known or inferred before it can be described as redoximorphic.
For more information about describing and sampling soils, visit:
www.nrcs.usda.gov/resources/guides-and-instructions/field...
or Chapter 3 of the Soil Survey manual:
www.nrcs.usda.gov/sites/default/files/2022-09/The-Soil-Su...
For additional information on "How to Use the Field Book for Describing and Sampling Soils" (video reference), visit:
www.youtube.com/watch?v=e_hQaXV7MpM
For additional information about soil classification using USDA-NRCS Soil Taxonomy, visit:
www.nrcs.usda.gov/resources/guides-and-instructions/keys-...
or;
www.nrcs.usda.gov/resources/guides-and-instructions/soil-...
Clay coated macropore in a Barnwell soil from Lee County, SC
Figure 3-27. Redoximorphic features that consist of a redox concentration, as an iron mass (reddish area along ped surface) and an iron depletion (light-colored area surrounding the root channel in ped interior). (Soil Survey Manual, USDA Handbook No. 18; issued March 2017).
For more information about the major principles and practices needed for making and using soil surveys and for assembling and using related soils data (Soil Survey Manual), visit:
www.nrcs.usda.gov/resources/guides-and-instructions/soil-...
Note the clay and finer soil particles coating the pore wall and fine root running the length of the pore. The lighter soil color along the exterior of the pore is formed by stripping of iron as water concentrates and moves downward carrying away iron in solution ("redoximorphic” process).
Redoximorphic features consist of color patterns in a soil that are caused by loss or gain of pigment compared to the matrix color, formed by oxidation/reduction of iron and/or manganese coupled with their removal, translocation, or accrual; or a soil matrix color controlled by the presence of iron. The composition and responsible formation processes for a soil color or color pattern must be known or inferred before it can be described as redoximorphic.
For more information about describing and sampling soils, visit:
www.nrcs.usda.gov/resources/guides-and-instructions/field...
or Chapter 3 of the Soil Survey manual:
www.nrcs.usda.gov/sites/default/files/2022-09/The-Soil-Su...
For additional information on "How to Use the Field Book for Describing and Sampling Soils" (video reference), visit:
www.youtube.com/watch?v=e_hQaXV7MpM
For additional information about soil classification using USDA-NRCS Soil Taxonomy, visit:
www.nrcs.usda.gov/resources/guides-and-instructions/keys-...
or;
www.nrcs.usda.gov/resources/guides-and-instructions/soil-...