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°Typical Reaction Class: narrative range of pH of sudace (A horizon)/subsoil (B ho• , or 'rf B is lacking, the first C horizon). Reaction Description pH Ranpe . Strongly Acid 5.1 - 5.5 Medium Acid 5.6 - 6.0 Slightly Acid 6.1 - 6.5 Neutral 6.6 - 7.3 Mildly Alkaline 7.4 - 7.6 Moderately Alkaline 7.9 - 6.4 Strongly Alkaline 6.5 - 9.0 Very Strongly Alkaline <9.0 Soils that are mildly alkaline usually are calcareous. Soils of moderate alkalinity or stronger are assumed to be calcareous. Strongly alkaline soils have increased sodium concentrations. °Wind Erodibilftv Group: This is an arbitrary grouping of soils based on texture and aggregation. Values range from 1 to 8, with lower numbers indicating increased susceptibility to wind erosion. The Wind Erodibilfty Group classification is far the sudace layer only, but could be applied to any layer within a soil profile. Class are defined in the National Soils Handbook (430-VI-NSH, July 1983, pg. 603-37), and USDA-SCS, May 1981, Wyoming Soil interpretation Procedure Guide, pg. 35. w WEG Soil Texture of Surface Laver Very High Erodibiliry 1 Very fine sand, Tine sand, sand, or coarse sand 2 Loamy very tine sand, loamy tine sand, loamy coarse sand High Erodibility 3 Very fine sandy loam, tine sandy loam, sandy loam, or coarse sandy loam 4 Clay, silly clay, noncalcareous clay loam, or silly clay loam with more than 35 percent clay content 4L Calcareous loam and sill loam, or calcareous clay loam, and silty clay loam Medium Erodibility 5 Noncalcareous loam and silt loam with less than 20 percent clay content, sandy clay bam, or sandy clay 6 Noncalcareous loam and silt loam with more than 20 percent clay content, or noncalcareous clay loam with less than 35 percent clay content Low Erodibilily 7 Sift, noncalcareous silty clay loam with less than 35 percent clay contem 8 Soils not suitable for cultivation due to coarse fragments or wetness, wind erosion not a problem 1pI Factor: This value Indicates the relayrve amount of sail that can be expected to erode, through wind influence, in Tons-Per-Acre-Per-Year (T/AC/YR). It is related to the wind erodibility group number and the percent of dry soil aggregates >0.84 mm In diameter. Values are taken from USDA-SCS, May 1981, Wyoming Soil Procedures guide, pg. 35.