LOCATION DISHPAN                 ID

Established Series
Rev. PS/ALH/CLM
01/2019

DISHPAN SERIES

The Dishpan series consists of moderately deep to bedrock, well drained soils that formed in alluvium and loess from basalt and volcanic ash. Permeability is moderately slow. Dishpan soils are on calderas and foothills and have slopes of 1 to 8 percent. The average annual precipitation is about 12 inches and the average annual temperature is about 43 degrees F.

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Calciargidic Argixerolls

TYPICAL PEDON: Dishpan loam -- on a north-facing slope of 4 percent in native rangeland, at 5,700 feet elevation. (Colors are for air dry soil unless otherwise stated. When described on June 15, 1981, the soil was slightly moist to 16 inches and dry below.)

A--0 to 4 inches; brown (10YR 5/3) loam, very dark grayish brown (10YR 3/2) moist; moderate medium granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine, few medium roots; many very fine and fine interstitial and vesicular pores; neutral (pH 6.8); clear smooth boundary. (3 to 6 inches thick)

Bt--4 to 13 inches; brown (10YR 5/3) clay loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; slightly hard, friable, sticky and plastic; common very fine and fine, few medium roots; many very fine and fine tubular and interstitial pores; many thin clay films on faces of peds; neutral (pH 7.2); clear smooth boundary. (7 to 15 inches thick)

Btk--13 to 16 inches; light yellowish brown (10YR 6/4) clay loam, brown (10YR 4/3) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, sticky and plastic; common fine, few very fine and medium roots; common very fine interstitial and tubular pores; common thin clay films on faces of peds; 5 percent gravel; violent effervescence; slightly alkaline (pH 7.8); clear smooth boundary. (0 to 8 inches thick)

Bkq--16 to 28 inches; very pale brown (10YR 8/3) very cobbly fine sandy loam, pale brown (10YR 6/3) moist; massive; soft, very friable; few very fine, fine, and medium roots; 35 percent gravel, 20 percent cobbles (rock fragments have lime and silica coatings up to 1 cm thick); violent effervescence; moderately alkaline (pH 8.0); abrupt wavy boundary. (7 to 20 inches thick)

2R--28 inches; fractured basalt with lime and silica coatings.

TYPE LOCATION: Owyhee County, Idaho; about 5 miles north and 12 miles west of Murphy Hot Springs; 500 feet south and 2,200 feet west of the northeast corner of section 23, T.15 S., R.7 E.

RANGE IN CHARACTERISTICS:

Mollic epipedon thickness - 7 to 15 inches (commonly includes upper part of argillic horizon)
Depth to calcium carbonates -10 to 20 inches
Depth to bedrock - 20 to 40 inches
Average annual soil temperature - 44 to 47 degrees F.
Average summer soil temperature - 64 to 67 degrees F.

A horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Rock fragments - 0 to 10 percent
Reaction (pH) - neutral through mildly alkaline

Bt and Btk horizons
Value - 4 through 6, 3 or 4 moist
Chroma - 3 or 4 dry or moist
Texture - CL, GR-CL, or SICL - 27 to 35 percent clay
Rock fragments - 5 to 20 percent
Reaction (pH) - neutral through moderately alkaline
Calcium carbonate equivalent - 0 to 15 percent

Bkq horizon
Value - 6 through 8 dry, 5 or 6 moist
Chroma - 3 or 4 dry or moist
Texture - CBV-FSL, CBV-SL, or GRV-SL
Rock fragments - 35 to 60 percent
Reaction (pH) - moderately through strongly alkaline
Calcium carbonate equivalent - 5 to 15 percent

COMPETING SERIES: These are the Eldgin (T), Fenelon, Shenon (T), Singletree, and Techick (T) soils. Eldgin, Shenon, Singletree, and Techick soils are greater than 40 inches to bedrock. Fenelon soils are strongly effervescent in the upper part of the argillic horizon and lack a Bkq horizon with greater than 35 percent rock fragments.

GEOGRAPHIC SETTING: Dishpan soils occur on nearly level to sloping calderas and foothills at elevations of 5,300 to 5,950 feet. Slopes range from 1 to 8 percent. The soils formed in alluvium and loess from basalt and volcanic ash. The climate is cool and moist in the winter and hot and dry in the summer. Average annual precipitation is 11 to 13 inches, and average annual temperature is 42 to 45 degrees F. The frost free season is 75 to 90 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Brace (T), Freshwater (T), Larioscamp (T), and Tanner (T) soils. All these soils have a duripan above 40 inches. Brace, Freshwater, and Larioscamp soils lack a mollic epipedon. Larioscamp and Tanner soils have more than 35 percent clay in the control section. All are on similar landscape positions.

DRAINAGE AND PERMEABILITY: Well drained; slow or medium runoff; moderately slow permeability.

USE AND VEGETATION: Dishpan soils are used mainly for rangeland and wildlife habitat. The dominant natural vegetation is Wyoming big sagebrush, bluebunch wheatgrass, and Sandberg bluegrass.

DISTRIBUTION AND EXTENT: Southwestern Idaho. This series is not extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Owyhee County Area, Idaho, 1992.

REMARKS: Diagnostic horizons and other features recognized in this pedon:

Mollic epipedon - zone 0 to 13 inches (A and Bt)

Argillic horizon and particle-size control section - zone 4 to 16 inches (Bt and Btk)

The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.

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National Cooperative Soil Survey
U.S.A.