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SSM - Appendix 2. Detailed Map Unit Description

The following map unit description is typical of those produced by the Web Soil Survey (WSS). Note that for ease of use by the public in the U.S., metric units have been converted to English units.

OcA—Olton clay loam, 0 to 1 percent slopes

Map Unit Setting

National map unit symbol: f5sv
Elevation: 2,800 to 5,000 feet
Mean annual precipitation: 17 to 21 inches
Mean annual air temperature: 57 to 63 degrees F
Frost-free period: 185 to 220 days
Farmland classification: Prime farmland if irrigated

Map Unit Composition

Olton and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the map unit.

Setting

Landform: Plains
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Clayey eolian deposits from the Blackwater Draw Formation of Pleistocene age

Typical profile

Ap - 0 to 8 inches: clay loam
Bt - 8 to 31 inches: clay loam
Btk1 - 31 to 48 inches: clay loam
Btk2 - 48 to 80 inches: clay loam

Properties and qualities

Slope: 0 to 1 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat): Moderately high (0.20 to 0.57 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum in profile: 50 percent
Salinity, maximum in profile: Nonsaline (0.0 to 1.0 mmho/cm)
Sodium adsorption ratio, maximum in profile: 1.0
Available water storage in profile: Moderate (about 8.9 inches)

Interpretive groups

Land capability classification (irrigated): 2e
Land capability classification (nonirrigated): 3e
Hydrologic soil group: C
Ecological site: Deep Hardland 16-21″ PZ (R077CY022TX)
Hydric soil rating: No

Minor Components

Pullman soils
Percent of map unit: 7 percent
Landform: Plains
Down-slope shape: Linear
Across-slope shape: Linear
Ecological site: Deep Hardland 16-21″ PZ (R077CY022TX)
Hydric soil rating: No

Acuff soils
Percent of map unit: 5 percent
Landform: Plains
Down-slope shape: Linear
Across-slope shape: Linear
Ecological site: Deep Hardland 16-21″ PZ (R077CY022TX)
Hydric soil rating: No

Estacado soils
Percent of map unit: 3 percent
Landform: Plains
Down-slope shape: Linear
Across-slope shape: Linear
Ecological site: Deep Hardland 16-21″ PZ (R077CY022TX)
Hydric soil rating: No