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Site Type Rangeland <br />MLRA: 69 - Upper Arkansas Valley Rolling Plains <br />Exposed areas of gravel are inherent to this site. The amount of bare ground varies with the amount <br />of surface gravel. Where slopes are gentle, water flow paths should be broken, irregular in <br />appearance or discontinuous with numerous debris dams or vegetative barriers and exhibit slight to <br />no evidence of rills, wind scoured areas or pedestaled plants. <br />As slopes become - steep, bare areas may increase. Expect to find evidence of water flow patterns <br />and pedestaled plants. Sub - surface soil layers, where not affected by gravel, are non - restrictive to <br />water movement and root penetration. <br />Major soil series correlated to this ecological site include: Cascajo, Chicosa, Karval, and Schamber. <br />Soil series that will be correlated to other MLRA's when outdated soil surveys are updated are: Potter <br />and Nihill. Both soils occur in aridic ustic moisture regime. Potter soils have a thermic temperature <br />regime. <br />Other soil series that have been correlated to this site include: Nihill, Potter <br />Parent Material Kind: gravelly alluvium <br />Parent Material Origin: mixed sedimentary <br />Surface Texture: sandy loam, loamy sand, loam <br />Surface Texture Modifier: none to very gravelly <br />Subsurface Texture Group: loamy sand, sand <br />Surface Fragments <_ 3" (% Cover): 0 to 60 percent <br />Surface Fragments > 3" ( %Cover): 0 to 35 percent <br />Subsurface Fragments <_ 3" (% Volume): 35 to 70 percent <br />Subsurface Fragments > 3" (% Volume): 5 to 35 percent <br />The percent gravel generally increases with depth and averages more than 35 percent. <br />Drainage Class: excessively somewhat excessively <br />Permeability Class: rapid moderately rapid <br />Depth (inches): 60 60 <br />Electrical Conductivity (mmhos /cm) *: 0 4 <br />Sodium Absorption Ratio *: 0 0 <br />Soil Reaction (1:1 Water) *: 6.1 8.4 <br />Soil Reaction (0.1M CaCl2) *: 5.6 8.4 <br />Available Water Capacity (inches) *: 0.8 2.2 <br />Calcium Carbonate Equivalent (percent) *: 0 40 <br />*These attributes represent 0 -40 inches in depth or to the first restrictive layer. <br />Technical Guide <br />Section IIE <br />Minimum Maximum <br />3 <br />Gravel Breaks <br />R069XY064C0 <br />USDA NRCS <br />Rev. 3/04 <br />