LOCATION OKERLAND UTTentative Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Torrifluventic Haploxerolls
TYPICAL PEDON: Okerland clay loam; irrigated cropland. (Colors are for air-dry soil unless otherwise stated.)
Ap--0 to 16 cm; brown (10YR 5/3) clay loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure parting to weak fine and medium granular; slightly hard, friable, slightly sticky, slightly plastic; many very fine and fine, and few medium and coarse roots; many very fine and fine, and few medium interstitial and tubular pores; very slightly effervescent; slightly alkaline (pH 7.6); clear smooth boundary. (10 to 28 cm thick)
A--16 to 28 cm; brown (10YR 5/3) clay loam, dark brown (10YR 3/3) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; many very fine and fine, and few medium and coarse roots; many very fine and fine, and few medium interstitial and tubular pores; very slightly alkaline (pH 7.8); clear smooth boundary. (8 to 13 cm thick)
C1--28 to 43 cm; pale brown (10YR 6/3) clay loam, brown (10YR 4/3) moist; massive; slightly hard, firm, slightly sticky, slightly plastic; common very fine and fine roots; common very fine and fine tubular pores; slightly effervescent; moderately alkaline (pH 8.0); clear smooth boundary. (10 to 25 cm thick)
C2--43 to 64 cm; grayish brown (10YR 5/2) clay loam, dark grayish brown (10YR 4/2) moist; massive; slightly hard, friable, slightly sticky, slightly plastic; common very fine and fine roots; few very fine and fine tubular pores; slightly effervescent; moderately alkaline (pH 8.0); clear smooth boundary. (13 to 35 cm thick)
C3--64 to 90 cm; brown (10YR 5/3) clay loam, brown (10YR 4/3) moist; massive; slightly hard, friable, slightly sticky, slightly plastic; few very fine and fine roots; few very fine tubular pores; slightly effervescent; moderately alkaline (pH 8.0); clear smooth boundary. (13 to 35 cm thick)
C4--90 to 118 cm; brown (10YR 5/3) clay loam, brown (10YR 4/3) moist; massive, slightly hard, firm, slightly sticky, slightly plastic; few very fine roots; slightly effervescent; moderately alkaline (pH 8.0); clear wavy boundary. (18 to 30 cm thick)
C5--118 to 150 cm; brown (10YR 5/3) clay loam, brown (10YR 4/3) moist; massive; slightly hard, firm, slightly sticky, slightly plastic; 5 percent fine (2 to 5 mm) gravel; slightly effervescent; moderately alkaline (pH 8.0).
TYPE LOCATION: Sevier County, Utah; 1 mile north of Monroe; 800 feet south and 4,300 feet east of the northwest corner of sec. 9, T. 25 S., R. 3 W.; Elsinore USGS 7.5 minute quadrangle; latitude 38 degrees 38 minutes 42 seconds N. and longitude 112 degrees 7 minutes 42 seconds W; NAD 83.
RANGE IN CHARACTERISTICS:
Soil moisture: Usually dry; moist in winter and early spring and for brief periods in late summer due to convection storms; aridic bordering on xeric soil moisture regime.
Mean annual soil temperature: 9.0 to 12.0 degrees C.
Thickness of the mollic epipedon: 25 to 48 cm.
Organic matter below the mollic epipedon: .5 to 1 percent to 150 cm, irregular decrease with increasing depth.
Particle-size control section - Clay content: 27 to 35 percent.
Rock fragments: Average 0 to 15 percent.
A horizon
Hue: 7.5YR or 10YR.
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 2 or 3.
Calcium carbonate equivalent: 0 to 5 percent.
C horizon
Hue: 7.5YR or 10YR.
Value: 5 or 6 dry, 4 or 5 moist.
Chroma: 2 to 4.
Texture: Clay loam, silty clay loam, or sandy clay loam.
Rock fragments: 0 to 15 percent (some pedons have thin horizons with up to 20 percent gravel)
Calcium carbonate equivalent: 0 to 10 percent.
Reaction: Slightly alkaline or moderately alkaline.
COMPETING SERIES: These are the Etta, Harpt, Kazul, and Juab series.
Etta soils have mean summer soil temperatures less than 19 degrees C, have moist values of 2 or 3 in the C horizon and do not have carbonates within 1 meter; Harpt, Kazul, and Juab soils have a particle-size control section with 18 to 27 percent clay.
GEOGRAPHIC SETTING:
Parent material: Alluvium derived from igneous and sedimentary rocks.
Landform: Alluvial flats and fan skirts.
Slopes: 0 to 2 percent.
Elevation: 1,425 to 1,860 meters.
Mean annual temperature: 8 to 10.5 degrees C.
Mean annual precipitation: 200 to 300 mm.
Frost-free period: 100 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Escalante, Jura, and Monroe series. The Escalante soils are coarse-loamy and have a calcic horizon. The Jura soils are fine and have vertic properties. The Monroe soils are fine-silty.
DRAINAGE AND PERMEABILITY: Well drained; very low or low runoff, moderately slow permeability; saturated hydraulic conductivity class is moderately high.
USE AND VEGETATION: These soils are used principally for irrigated cropland and rangeland. Potential vegetation consists of Wyoming big sagebrush, bluebunch wheatgrass, Indian ricegrass, and bottlebrush squirreltail.
DISTRIBUTION AND EXTENT: Central Utah; MLRA 28A; small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES PROPOSED: Sevier County, Utah, soil survey area. 2008.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from 0 to 28 cm. (Ap and A horizons)
Torrifluventic feature The irregular decrease in organic matter in the zone from 25 to 125 cm.
Particle-size control section - The zone from 25 to 100 cm (C1, C2, C3 and part of the A and C4 horizons).