AmB, AmC, AmC3 - Armour

AmB—Armour silt loam, 2 to 5 percent slopes

Map Unit Setting

  • National map unit symbol: 2td31

  • Elevation: 500 to 850 feet

  • Mean annual precipitation: 48 to 58 inches

  • Mean annual air temperature: 57 to 61 degrees F

  • Frost-free period: 190 to 230 days

  • Farmland classification: All areas are prime farmland

Map Unit Composition

  • Armour and similar soils: 90 percent

  • Estimates are based on observations, descriptions, and transects of the mapunit.

Description of Armour

Setting

  • Landform: Stream terraces

  • Landform position (two-dimensional): Footslope, toeslope

  • Landform position (three-dimensional): Base slope, tread

  • Down-slope shape: Concave, convex

  • Across-slope shape: Linear, convex

  • Parent material: Silty alluvium over clayey residuum weathered from phosphatic limestone

Typical profile

  • A - 0 to 19 inches: silt loam

  • Bt - 19 to 58 inches: silty clay loam

  • BC - 58 to 79 inches: clay

Properties and qualities

  • Slope: 2 to 5 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 0.60 in/hr)

  • Depth to water table: More than 80 inches

  • Frequency of flooding: None

  • Frequency of ponding: None

  • Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm)

  • Available water storage in profile: High (about 11.6 inches)

Interpretive groups

  • Land capability classification (irrigated): 2e

  • Land capability classification (nonirrigated): 2e

  • Hydrologic Soil Group: B

  • Hydric soil rating: No

AmC—Armour silt loam, 5 to 12 percent slopes

Map Unit Setting

  • National map unit symbol: 2td32

  • Elevation: 500 to 850 feet

  • Mean annual precipitation: 48 to 58 inches

  • Mean annual air temperature: 57 to 61 degrees F

  • Frost-free period: 190 to 230 days

  • Farmland classification: Not prime farmland

Map Unit Composition

  • Armour and similar soils: 90 percent

  • Estimates are based on observations, descriptions, and transects of the mapunit.

Description of Armour

Setting

  • Landform: Stream terraces

  • Landform position (two-dimensional): Footslope, toeslope

  • Landform position (three-dimensional): Base slope, tread

  • Down-slope shape: Concave, convex

  • Across-slope shape: Linear, convex

  • Parent material: Silty alluvium over clayey residuum weathered from phosphatic limestone

Typical profile

  • A - 0 to 19 inches: silt loam

  • Bt - 19 to 58 inches: silty clay loam

  • BC - 58 to 79 inches: clay

Properties and qualities

  • Slope: 5 to 12 percent

  • Depth to restrictive feature: More than 80 inches

  • Natural drainage class: Well drained

  • Runoff class: Medium

  • Capacity of the most limiting layer to transmit water (Ksat): Moderately high (0.20 to 0.60 in/hr)

  • Depth to water table: More than 80 inches

  • Frequency of flooding: None

  • Frequency of ponding: None

  • Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm)

  • Available water storage in profile: High (about 11.6 inches)

Interpretive groups

  • Land capability classification (irrigated): 3e

  • Land capability classification (nonirrigated): 3e

  • Hydrologic Soil Group: B

  • Hydric soil rating: No

AmC3—Armour silty clay loam, 5 to 12 percent slopes, severely eroded

Map Unit Setting

  • National map unit symbol: 2v58r

  • Elevation: 410 to 970 feet

  • Mean annual precipitation: 48 to 58 inches

  • Mean annual air temperature: 57 to 61 degrees F

  • Frost-free period: 190 to 230 days

  • Farmland classification: Not prime farmland

Map Unit Composition

  • Armour and similar soils: 90 percent

  • Estimates are based on observations, descriptions, and transects of the mapunit.

Description of Armour

Setting

  • Landform: Stream terraces

  • Landform position (two-dimensional): Footslope

  • Landform position (three-dimensional): Base slope, tread

  • Down-slope shape: Concave

  • Across-slope shape: Linear

  • Parent material: Silty alluvium over clayey residuum weathered from phosphatic limestone

Typical profile

  • A - 0 to 6 inches: silty clay loam

  • Bt - 6 to 58 inches: silty clay loam

  • BC - 58 to 79 inches: silty clay loam

Properties and qualities

  • Slope: 5 to 12 percent

  • Depth to restrictive feature: More than 80 inches

  • Natural drainage class: Well drained

  • Runoff class: Medium

  • Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high (0.60 to 2.00 in/hr)

  • Depth to water table: More than 80 inches

  • Frequency of flooding: None

  • Frequency of ponding: None

  • Salinity, maximum in profile: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm)

  • Available water storage in profile: High (about 10.9 inches)

Interpretive groups

  • Land capability classification (irrigated): None specified

  • Land capability classification (nonirrigated): 4e

  • Hydrologic Soil Group: B

  • Hydric soil rating: No

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