2011-11-02_REVISION - M2003019 (5)

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Site Type: Rangeland MLRA: 69 - Upper Arkansas Valley Rolling Plains Representative Soil Features The soils of this site are very deep but also include moderately deep and deep soils. Typically, they are moderately well or well drained and have slow to moderate permeability. Typically, these soils formed in alluvium, loess and eolian deposits derived from mixed calcareous sources. These soils occur on plains, fans, and terraces. The available water capacity is typically high for the deep and very deep soils and low to moderate for the moderately deep soils. The soil surface layer ranges from 3 to 16 inches thick and is typically loam, clay loam or silt loam. The pH of these soils ranges from neutral to moderately alkaline in the surface and subsoil, and moderately alkaline to strongly alkaline in the substratum. The soil moisture regime is typically ustic aridic, but ranges to aridic in the driest areas of MLRA 69. The soil temperature regime is mesic. The Historic Climax Plant Community (HCPC) should show slight to no evidence of rills, wind scoured areas or pedestalled plants. Water flow paths are broken, irregular in appearance or discontinuous with numerous debris dams or vegetative barriers. The soil surface is stable and intact. Sub - surface soil layers are non - restrictive to water movement and root penetration. Major soil series correlated to this ecological site include: Almagre, Baca, Bacid, Campo, Colby, Fort, Fort Collins, Harvey, Haverson, Haversid, Kim, Manvel, Manzanola, Minnequa, Renohill, Stoneham, Tyrone, Villedry, Weld, Wiley, Wilid Soils that will be correlated to other MLRA's when outdated soil surveys are updated: The Baca, Campo, Colby, Fort Collins, Renohill, Weld, and Wiley soils will be correlated to MLRA 67 due to soil classification changes. These soils have an aridic ustic moisture regime. Other soil series that have been correlated to this site include: none Parent Material Kind: loess, mixed eolian deposits, and alluvium. Parent Material Origin: calcareous sedimentary deposits. Surface Texture: loam, silt loam, clay loam Surface Texture Modifier: none Subsurface Texture Group: silty clay loam, clay loam, loam, silt loam, clay Surface Fragments <_ 3" (% Cover): 0 to 15 percent Surface Fragments > 3" ( %Coverr): 0 to 15 percent Subsurface Fragments <_ 3" (% Volume): 0 to 45 percent Subsurface Fragments > 3" (% Volume): 0 to 15 percent Subsurface fragments do not exceed 35 percent above a depth of 20 inches and do not exceed 60 percent in the lower part of the profile. Typically, these soils average less than 15 percent rock fragments, but some horizons range from gravelly to very gravelly below 20 inches. Drainage Class: Permeability Class: Depth (inches): Electrical Conductivity (mmhos /cm) *: Sodium Absorption Ratio *: Soil Reaction (1:1 Water) *: Soil Reaction (0.1M CaCl2) *: Available Water Capacity (inches) *: Calcium Carbonate Equivalent (percent) *: Minimum moderately well moderate 0 0 6.8 6.8 2.5 0 *These attributes represent 0 -40 inches in depth or to the first restrictive layer. Technical Guide Section IIE 3 Maximum well slow 3 5 8.4 8.4 7.5 40 Loamy R069XY006CO USDA NRCS Rev. 3/04