LOCATION DEUNAH                  ID+NV

Established Series
Rev. TWH/ALH/CLM/JBF
01/2019

DEUNAH SERIES

The Deunah series consists of moderately deep to duripan, well drained soils that formed in alluvium and eolian material derived mainly from basalt and volcanic ash. Deunah soils are on tablelands, piedmonts, hills and plateaus and have slopes of 1 to 10 percent. The average annual precipitation is about 380 mm and the average annual temperature is about 6 degrees C.

TAXONOMIC CLASS: Very-fine, smectitic, frigid Abruptic Durixeralfs

TYPICAL PEDON: Deunah silt loam -- on a 4 percent southwest-facing slope at an elevation of 1,745 meters in native rangeland. The surface has about 1 percent stone cover. (Colors are for air dry soil unless otherwise noted. When described on November 12, 1980, the soil was moist to 38 cm and dry below.)

A--0 to 10 cm; pale brown (10YR 6/3) silt loam, brown (10YR 4/3) moist; weak medium subangular blocky structure parting to moderate fine granular; soft, very friable, slightly sticky and moderately plastic; many very fine and fine roots; many very fine tubular pores; few fine dark concretions (manganese oxides); slightly acid (pH 6.2); clear smooth boundary. (5 to 25 cm thick)

AB--10 to 23 cm; pale brown (10YR 6/3) silt loam, brown (10YR 4/3) moist; moderate medium subangular blocky structure parting to moderate very fine angular blocky; slightly hard, friable, slightly sticky and moderately plastic; many fine and very fine roots; many very fine tubular pores; 75 percent uncoated silt grains on faces of peds; few fine dark concretions (manganese oxide); slightly acid (pH 6.4); abrupt smooth boundary. (0 to 15 cm thick)

2Bt--23 to 48 cm; dark yellowish brown (10YR 4/4) clay, light yellowish brown (10YR 6/4) crushed, dark yellowish brown (10YR 4/4) moist; strong medium columnar structure; very hard, very firm, very sticky and very plastic; common fine and very fine roots; few very fine interstitial pores; columns are capped with light gray (10YR 7/2) silt; 5 percent slickensides; few fine dark concretions (manganese oxides); neutral (pH 6.7); clear wavy boundary. (10 to 50 cm thick)

2Bkq--48 to 58 cm; very pale brown (10YR 7/4) loam, yellowish brown (10YR 5/6) moist; weak thick platy structure; hard, firm, slightly sticky and nonplastic; few very fine roots; common very fine tubular pores; few very fine durinodes; slightly effervescent, carbonate segregated in few fine filaments and seams; slightly alkaline (pH 7.8); clear wavy boundary. (0 to 10 cm thick)

2Bkqm--58 to 71 cm; yellow (10YR 7/6) indurated duripan, yellowish brown (10YR 5/8) moist; strong medium platy structure; extremely hard, very firm; very few fine tubular pores; continuous opal coatings (1 to 4 mm thick) on surfaces of plates; slightly effervescent, carbonate segregated in common fine seams; 30 percent cobbles; moderately alkaline (pH 8.0); abrupt wavy boundary. (5 to 20 cm thick)

3R--71 cm; fractured basalt.

TYPE LOCATION: Owyhee County, Idaho; about 6 miles north and 11 miles west of Owyhee, Nevada; 500 feet north and 1,300 feet west of the southeast corner of section 15, T. 16 S., R. 1 E.; USGS Juniper Basin SE, 7.5 minute topographic quadrangle; latitude 42 degrees 01 minute 38 seconds north and longitude 116 degrees 19 minutes 12 minutes W; WGS84 Decimal Degrees 42.0272222 latitude, -116.3200000 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Usually moist in winter and spring; dry from July through October; xeric moisture soil regime that borders on aridic.
Average annual soil temperature: 5 to 8 degrees C.
Depth to duripan: 50 to 86 cm.
Depth to bedrock: 56 to 100 cm.

Particle-size control section - Clay content: 60 to 70 percent.
Rock fragments: Average 0 to 15 percent.

A horizon
Value: 5 or 6 dry (more than 5.5 mixed), 3 or 4 moist.
Chroma: 2 or 3 moist and dry.
Reaction: Moderately acid through neutral.

AB horizon
Value: 3 or 4 moist.
Chroma: 2 through 4 moist and dry.
Texture: Loam, silt loam, silty clay loam or clay loam.
Reaction: Slightly acid or neutral.

2Bt horizon
Hue: 7.5YR or 10YR.
Value: 4 through 6 dry, 3 or 4 moist.
Chroma: 3 through 6 moist and dry.
Reaction: Slightly acid to slightly alkaline.

Bkqm horizon
Hue: 7.5YR or 10YR.
Value: 5 through 8 dry, 5 or 6 moist.
Chroma: 2 through 8 moist or dry.
Rock fragments: 10 to 80 percent.
Effervescence - Noneffervescent or slightly effervescent

COMPETING SERIES: There are no competing soils listed in the same family.

GEOGRAPHIC SETTING: Deunah soils are on tablelands, piedmonts, hills, and plateaus. Slopes range from 1 to 10 percent. Elevation ranges from 1,590 to 1,875 meters. The soils formed in alluvial and eolian material derived mainly from basalt, rhyolite and volcanic ash. The average annual precipitation is 300 to 400 mm, most of which falls as snow and spring rain. The average annual temperature is 4 to 7 degrees C. The frost-free season is 60 to 100 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bulake, Lostvalley, Petan, Wagonbox, Wickahoney, and Yatahoney. Bulake, and Wickahoney soils are shallow to bedrock. Yatahoney soils lack an abrupt textural change. Lostvalley soils lack a duripan. Petan and Wagonbox soils are shallow to duripan and are skeletal.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; slow to medium runoff; moderately low saturated hydraulic conductivity.

USE AND VEGETATION: Deunah soils are used mainly for rangeland and wildlife habitat. The dominant natural vegetation is alkali sagebrush, Idaho fescue, bluebunch wheatgrass, Nevada bluegrass, bighead clover, and Hooker balsamroot.

DISTRIBUTION AND EXTENT: Southwestern Idaho and north-central Nevada. The series is of moderate extent. MLRA 25.

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

SERIES ESTABLISHED: Owyhee County, Idaho, Duck Valley Indian Reservation, Idaho-Nevada, 1984.

REMARKS: Diagnostic horizons and other features recognized in this pedon:
Ochric epipedon - The zone from the surface to 23 cm (A and AB horizons).
Argillic horizon - The zone from 23 to 48 cm (2Bt horizon).
Duripan - The zone from 58 to 71 cm (2Bkqm horizon).
Bedrock - The contact at 71 cm (R layer).
Particle-size control section - The zone from 23 to 58 cm (2Bt and 2Bkq horizons).

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National Cooperative Soil Survey
U.S.A.