LOCATION TAKEUCHI ID

Established Series
Rev. ALH/CLM
12/2019

TAKEUCHI SERIES

The Takeuchi series consists of moderately deep, somewhat excessively drained soils that formed in material weathered from intermediate intrusive rocks. They are on foothills and mountains. Slopes are 0 to 60 percent. The average annual precipitation is about 460 mm and the average annual temperature is about 6.1 degrees C.

TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, frigid Typic Haploxerolls

TYPICAL PEDON: Takeuchi fine gravelly coarse sandy loam -- on a 5 percent south-facing slope, in rangeland at 1,800 meter elevation. (Colors are for air dry soil unless otherwise stated).

A1--0 to 10 cm; dark grayish brown (10YR 4/2) fine gravelly coarse sandy loam, very dark brown (10YR 2/2) moist; weak thin platy structure parting to moderate very fine granular; slightly hard, very friable, slightly sticky and nonplastic; many fine roots; many very fine pores; 15 percent gravel; slightly acid (pH 6.2); clear smooth boundary. (5 to 10 cm thick)

A2--10 to 30 cm; dark grayish brown (10YR 4/2) fine gravelly coarse sandy loam, very dark brown (10YR 2/2) moist; weak fine and medium subangular blocky structure parting to moderate very fine granular; soft, very friable, slightly sticky and nonplastic; many fine, common medium and coarse roots; many very fine tubular pores; 15 percent gravel; slightly acid (pH 6.3); clear wavy boundary. (6 to 14 inches thick)

Bw1--30 to 46 cm; brown (10YR 4/3) fine gravelly coarse sandy loam, dark brown (10YR 3/3) moist; moderate medium and fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common fine and medium roots; many very fine tubular pores; few thin clay films on faces of peds, in pores, and bridging sand grains; 20 percent fine gravel; few krotovinas; slightly acid (pH 6.4); clear wavy boundary. (0 to 23 cm thick)

Bw2--46 to 66 cm; brown (10YR 5/3) fine gravelly coarse sandy loam, dark brown (10YR 3/3) moist; moderate medium and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine roots; many very fine tubular pores; 20 percent fine gravel; slightly acid (pH 6.4); clear irregular boundary. (15 to 38 cm thick)

Cr--66 to 91 cm; moderately weathered granite or quartz monzonite; contains many dark mineral grains and mica particles; common brown (7.5YR 5/4) and light yellowish brown (10YR 6/4), and few reddish brown (5YR 5/4) and yellowish red (5YR 5/6) stains; hard or very hard, can break in hand to very fine gravel, very coarse sand, and coarse sand; few dark grayish brown (10YR 4/2) clay films and few fine roots in some cracks; slightly acid (pH 6.5); gradual broken boundary. (0 to 38 cm thick)

R--91 cm; somewhat fractured and slightly weathered granite or quartz monzonite.

TYPE LOCATION: Owyhee County, Idaho; Northwest Hydrology Research Watershed, Reynolds Creek; about 500 feet east and 2,500 feet north of the southwest corner of section 23, T. 3 S., R. 4 W.; USGS Rooster Comb Peak 7.5 minute topographic quadrangle; latitude 43 degrees 08 minutes 51 seconds N and longitude 116 degrees 47 minutes 12 seconds W; WGS84 Decimal Degrees 43.1475000 latitude, -116.7866667 longitude.

RANGE IN CHARACTERISTICS:

Thickness of Mollic epipedon - 20 to 50 cm.
Reaction (pH) - moderately acid to neutral.
Depth to hard bedrock - 50 to 100 cm.
Particle-size control section - 5 to 18 percent clay, 15 to 30 percent coarse fragments
Soil moisture control section - continually dry 45 to 70 days after the summer solstice. Typic xeric moisture regime.
Average annual soil temperature - 4.4 to 8.3 degrees C.
Average summer soil temperature - 15.6 to 18.3 degrees C.

A horizon
Value - 3 through 5 dry, 2 or 3 moist
Chroma - 2 or 3

Bw1 and Bw2 horizons
Value - 4 through 6 dry, 3 or 4 moist
Chroma - 3 or 4
Texture - GRF-COSL, GR-COSL, or GRF-SL
Clay content - 6 to 18 percent
Coarse fragments - 15 to 35 percent (mainly fine gravel)

COMPETING SERIES: These are the Cowers and Shamel series. Both of these soils are more than 100 cm deep to bedrock.

GEOGRAPHIC SETTING: Takeuchi soils are on undulating to very steep sideslopes and ridges of foothills and mountains. Elevations range from 1,405 to 2,380 meters. Slopes range from 0 to 60 percent. The soils formed in residuum and colluvium from granite, quartz monzonite, other intermediate intrusive rocks. The climate is cool and moist in the winter and hot and dry in the summer. The average annual precipitation is 360 to 610 mm. The average annual temperature is 3.9 to 7.2 degrees C. The frost-free period is 55 to 100 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Farrot, Kanlee, Ola, and Yakus soils. Farrot, Kanlee, and Yakus soils have argillic horizons. Ola soils have Mollic epipedons more than 50 cm thick.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Somewhat excessively drained; slow to very rapid runoff; moderately rapid saturated hydraulic conductivity.

USE AND VEGETATION: Takeuchi soils are used mainly for rangeland and wildlife habitat; small areas are used for pasture and hayland. The dominant natural vegetation is bluebunch wheatgrass, Sandberg bluegrass, big sagebrush, Idaho fescue, bitterbrush and in places, snowberry and mountain mahogany.

DISTRIBUTION AND EXTENT: Southern Idaho. These soils are moderately extensive. MLRA 25 and 43B.

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

SERIES ESTABLISHED: Owyhee County, Idaho, 1975.

REMARKS: Diagnostic horizons and other features recognized in this pedon:
Mollic epipedon - The zone 0 to 46 cm (The A1, A2, and Bw1 horizons).

Cambic horizon - The zone from 30 to 66 cm (The Bw1 and Bw2 horizons).
Paralithic contact - The zone from 66 to 91 cm (The Cr horizon).
Lithic contact - The boundary at 91 cm (The R boundary).
Particle-size control section - The zone from 25 to 66 cm (Part of A2 and the Bw1 and Bw2 horizons).

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.

National Cooperative Soil Survey
U.S.A.