Sodium Adsorption Ratio
National Park Service: Thomas Colson. 2011. Sodium Adsorption Ratio
Sodium adsorption ratio is a measure of the amount of sodium (Na) relative to calcium (Ca) and magnesium (Mg) in the water extract from saturated soil paste. It is the ratio of the Na concentration divided by the square root of one-half of the Ca + Mg concentration. Soils that have SAR values of 13 or more may be characterized by an increased dispersion of organic matter and clay particles, reduced saturated hydraulic conductivity (Ksat) and aeration, and a general degradation of soil structure. For each soil layer, this attribute is actually recorded as three separate values in the database. A low value and a high value indicate the range of this attribute for the soil component. A "representative" value indicates the expected value of this attribute for the component. For this soil property, only the representative value is used.
- Type
- Geospatial Dataset
- Authors
- National Park Service: Thomas Colson
- Date of Issue
- 2011-10-10
- Units
- GRSM
- Keywords
- APHN, Appalachian Highlands Network, Blockhouse TN, Blount County, Bryson City NC, Bunches Bald NC, Cades Cove TN, Calderwood TN, Clingmans Dome NC, Cocke County, Cove Creek Gap NC, Dellwood NC, Environment, Fines Creek NC, Fontana Dam NC, Gatlinburg TN, Graham County, Great Smoky Mountains National Park, GRSM, Hartford TN, Haywood County, Jones Cove TN, Kinzel Springs TN, Luftee Knob NC, Mount Guyot TN, Mount Le Conte TN, National Standards for Spatial Digital Accuracy (NSSDA), Natural Resource Inventory And Monitoring Program, NC, Noland Creek NC, None, North Carolina, NRIM, Pigeon Forge TN, Richardson Cove TN, SERO, Sevier County, Silers Bald NC, Smokemont NC, sodium adsorption ratio, Soil Survey, Soil Survey Geographic, Soils, Southeast Region, SSURGO, Swain County, Tallassee TN, Tapoco NC, Tennessee, Thunderhead Mountain NC, TN, Tuskeegee NC, U.S., United States, US, USA, Waterville TN, Wear Cove TN, Whittier NC