LOCATION TUCKER                  ID

Established Series
Rev. KAB/ALH/CLM/JBF
12/2019

TUCKER SERIES

The Tucker series consists of very deep, somewhat poorly drained soils that formed in recent alluvium from welded tuff and basalt. They are on alluvial terraces and flood plains. Slopes range from 0 to 4 percent. The average annual precipitation is about 360 mm and the average annual temperature is about 7 degrees C.

TAXONOMIC CLASS: Fine, smectitic, frigid Cumulic Haploxerolls

TYPICAL PEDON: Tucker silt loam -- on a slope of 1 percent under rangeland vegetation at 1,734 meter elevation. (When described on September 25, 1979, the soil profile was moist throughout. Colors are for air dry soil unless otherwise stated.)

A--0 to 15 cm; dark grayish brown (10YR 4/2) silt loam, black (10YR 2/1) moist; moderate fine platy structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine and medium roots; many very fine and fine tubular pores; moderately alkaline (pH 8.1); abrupt smooth boundary. (18 to 28 cm thick)

AB--15 to 28 cm; dark grayish brown (10YR 4/2) silty clay loam, black (10YR 2/1) moist; weak medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; many very fine, fine and medium roots; many very fine and fine tubular pores; slightly alkaline (pH 7.8); clear smooth boundary. (0 to 33 cm thick)

Bw--28 to 81 cm; dark grayish brown (10YR 4/2) silty clay, black (10YR 2/1) moist; common fine distinct redox concentration, dark yellowish brown (10YR 4/4) moist; moderate medium prismatic structure parting to moderate medium subangular blocky; hard, firm, moderately sticky and moderately plastic; many very fine, fine and medium roots; many very fine and fine tubular pores; neutral (pH 6.9); clear smooth boundary. (38 to 58 cm thick)

Cg--81 to 178 cm; gray (10YR 5/1) silty clay, black (10YR 2/1) moist; common medium faint redox concentration, very dark grayish brown (10YR 3/2) moist; massive; hard, firm, moderately sticky and moderately plastic; common very fine and fine roots; common very fine and fine tubular pores; neutral (7.0 pH).

TYPE LOCATION: Twin Falls County, Idaho, about 14 miles southeast of Rogerson, Idaho; about 1,000 feet south and 540 feet east of the northwest corner section 11, T. 16 S., R. 17 E.; USGS Big Creek Ranch 7.5-minute topographic quadrangle; latitude 42 degrees 3 minutes 12 seconds N and longitude 114 degrees 26 minutes 9 seconds W; WGS84 Decimal Degrees 42.0533333 latitude, -114.4358333 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Moist winter and spring, dry late July through early October; typic xeric soil moisture regime.
Mean annual soil temperature: 7 to 8 degrees C.
Depth to redox concentration: 25 to 50 cm.
Depth to Cg horizon: 64 to 90 cm.
Depth to high water table: 46 to 90 cm.
Depth to bedrock: More than 152 cm.
Organic carbon decreases irregularly with depth.

Particle-size control section - Average clay content: 35 to 50 percent.

A horizon
Value: 3 to 5 dry.
Chroma: 1 or 2 dry or moist.
Structure: Granular or platy.
Reaction (pH): Neutral through moderately alkaline.

Bw horizon
Hue: 2.5Y or 10YR.
Value: 3 to 5 dry, 2 to 4 moist.
Chroma: 1 or 2 dry or moist.
Texture: Silty clay loam or silty clay.
Structure: Subangular blocky, angular blocky, or prismatic.
Reaction (pH): Neutral or slightly alkaline.

C horizon
Hue: 2.5Y or 10YR.
Value: 5 or 6 dry, 2 to 4 moist.
Chroma: 1 to 3 dry or moist.
Reaction (pH): Neutral to moderately alkaline.

COMPETING SERIES: There are no competing series listed in this family.

GEOGRAPHIC SETTING: Tucker soils are on alluvial terraces and flood plains. The slopes range from 0 to 4 percent. The soils formed in recent alluvium from welded tuff, basalt, and volcanic ash. Elevations are 1,400 to 1,980 meters. The average annual precipitation is 300 to 410 mm. The average annual temperature is 6 to 7 degrees C. The frost-free period is 75 to 100 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are Congle, Doodlelink, Oshone, and Zola soils. Congle and Doodlelink soils occur on backslopes and footslopes. Congle soils are fine-loamy. Doodlelink soils are loamy-skeletal. Oshone soils occur on terraces, are well drained, and moderately deep to a hardpan. Zola soils occur on higher terraces and flood plains, are fine-loamy, and moderately well drained.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Somewhat poorly drained; slow runoff; slow saturated hydraulic conductivity.

USE AND VEGETATION: Tucker soils are used mainly for rangeland and irrigated hayland and pasture. Dominant natural vegetation is matmuhly, prairie June grass, basin wildrye, rush, sedge, basin big sagebrush, and silver sagebrush.

DISTRIBUTION AND EXTENT: Tucker soils are of small extent in southern Idaho. 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:
Mollic epipedon (cumulic) - The zone from the soil surface to 81 cm with irregular decrease in O.M. (A, AB, and Bw horizons).
Particle-size control section: The zone from 25 to 100 cm (part of the Bw and Cg horizons).

ADDITIONAL DATA: Clay percent by hydrometer - 28 to 81 cm = 44 percent; 81 to 178 cm= 58 percent.

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National Cooperative Soil Survey
U.S.A.