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Hydric Soils Technical Note 10Additional changes to "Field Indicators of Hydric Soils in the United States" (Version 4.0, March 1998).Send comments to Wade Hurt. The NTCHS met in Houston (Stafford), Texas in May 2000 and made the following changes and corrections. Change 1: On page 14, F3, column 1, definition of Depleted Matrix, insert the following sentence: The minimum thickness requirement is 5 cm (2 in.) if the depleted matrix is entirely within the upper 15 cm (6 in.) of the mineral soil. On page 20, column 1, add the following test indicator: TA3. Coast Prairie Redox. For use in MLRA 150A of LRR T. A layer
starting within 15 cm (6 in.) of the soil surface that is at least 10 cm
(4 in.) thick and has a matrix chroma 3 or less with 2% or more distinct
or prominent redox concentrations as soft masses and/or pore linings. Change 3: On page 22, TF7, column 1, last sentence in Definition of the indicator should read as follows: The layer(s) above the depleted or gleyed matrix have hue 10YR or yellower, value 2.5 or less and chroma of 1 or less to a depth of 30 cm (12 in.) and value 3 or less and chroma 1 or less in the remainder of the epipedon. Change 4: On page 30, the following reference is added: U.S.
Department of Agriculture, Soil Survey Staff, 1999. Soil Taxonomy: A
basic system of soil classification for making and interpreting soil
surveys. USDA Agricultural
Handbook 436. U.S. Govt. Printing Off., Washington, DC. |
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