LOCATION NEHAR UTEstablished Series
TAXONOMIC CLASS: Clayey-skeletal, mixed, superactive, mesic Ustic Paleargids
TYPICAL PEDON: Very stony sandy loam - rangeland (Colors are for air dry soil unless otherwise noted.)
A1--0 to 5 inches; brown (7.5YR 5/4) very stony sandy loam, dark brown (7.5YR 3/2) moist; moderate very fine granular structure; slightly hard, very friable, slightly sticky, slightly plastic; common very fine roots; few fine, and common very fine interstitial and tubular pores; 25 percent of the surface covered with stones; 50 percent stones, cobbles, and gravel; neutral (pH 7.2); abrupt smooth boundary. (2 to 8 inches thick)
B21t--5 to 16 inches; reddish brown (5YR 5/4) stony clay, reddish brown (5YR 4/4) moist; strong coarse prismatic structure that parts to moderate fine angular blocky struc-ture; extremely hard, very firm, very sticky, plastic; few medium and common very fine roots; common fine and many very fine tubular pores; many moderately thick clay films on faces of peds and as bridges between sand grains; 40 percent stones, cobbles, ant gravel; slightly acid (pH 6.5); gradual wavy boundary. (6 to 27 inches thick)
B22t--16 to 29 inches; yellowish red (5YR 5/6) stony sandy clay, reddish brown (5YR 4/4) moist; moderate coarse prismatic structure that parts to moderate, fine and very fine subangular blocky structure; very hard, firm, sticky, plastic; few fine, ant very fine roots; common fine, and many very fine tubular pores; common moderately thick clay films on faces of peds and as bridges between sand grains; 45 percent stones, cobbles, and gravel; slightly acid (pH 6.4); gradual wavy boundary. (0 to 13 inches thick)
B3--29 to 47 inches; yellowish red (5YR 5/6) very stony sandy clay loam, reddish brown (5YR 4/4) moist; moderate medium and fine subangular blocky structure; very hard, firm, sticky, plastic; few fine and very fine roots; few medium, common fine, and many very fine tubular pores; few thin clay films on faces of peds and in pores; 55 percent stones, cobbles, and gravel; slightly acid (pH 6.4); gradual smooth boundary. (O to 19 inches thick)
C--47 to 60 inches; light brown (7.5YR 6/4) stony sandy loam, reddish brown (5YR 4/4) moist; massive; very hard, friable, slightly sticky, nonplastic; few fine and many very fine tubular pores; 55 percent stones, cobbles, and gravel; slightly acid (pH 6.4).
TYPE LOCATION: Washington County, Utah; .2 miles west of the Browse interchange on I-15; 1,320 feet east and 800 feet south of the northwest corner of sec. 11, T.40S., R.13W.
RANGE IN CHARACTERISTICS: The solum is 40 to more than 60 inches thick. The soil ranges from slightly acid to mildly alkaline and is noncalcareous throughout. Stone cover on the surface ranges from 5 to 25 percent. Mean annual soil temperature is 50 to 57 degrees F., and mean summer soil temperature is 65 to 70 degrees F. The soils are usually dry during the period the soil temperature ls above 41 degrees F. They are moist in some part of the moisture control section for 30 to 40 days during the summer months and are dry for 70 to 85 days during the 120 days following the winter solstice.
The Al horizon has hue of 7.5YR, 10YR or 5YR, value of 4 through 6 dry, 2 or 3 moist, and chroma of 2 through 4. The combinations of color value of 4 or 5 dry and chroma of 2 or 3 extend to depths of less than 7 inches. The Al horizon is very stony sandy loam or stony sandy loam and contains 30 to 65 percent rock fragments.
The B2t horizon has hue of 5YR or 7.5YR, value of 4 through 6 dry, 3 or 4 moist, and chroma of 2 through 6. It is mainly stony clay or sandy clay but in some pedons it is very cobbly or very gravelly sandy clay. Rock fragment content ranges from 35 to 70 percent. This horizon has moderate or strong, medium or coarse, prismatic structure that parts to moderate or strong, very fine through medium, angular or subangular blocky structure. It is 15 to 27 inches thick.
The C horizon has hue of 5YR or 7.5YR, value of 4 or 5 moist, and chroma of 3 through 6. It is stony, very stony, very cobbly or very gravelly sandy loam, or very cobbly loamy sand and it contains 35 to 80 percent rock fragments.
COMPETING SERIES: These are the Lonti, Malposa, Poley, Silver, Tacan, and Tobish series. Lonti, Malposa, Poley, Silver, and Tobish soils have less than 35 percent rock fragments in the control section. Also, Lonti and Poley soils have accumulations of carbonates and Tobish soils have a lithic content at depths of 20 to 35 inches. Tacan soils have gravelly fine sandy clay loam B2t horizons.
GEOGRAPHIC SETTING: Nehar soils are on alluvial fan and low rolling hills at elevations of 4,200 to 6,100 feet. Slopes range from 3 to 30 percent. These soils formed alluvium and residuum weathered from coarse grained acid igneous rock, quartzite conglomerate, and with minor influence from basalt. Mean annual temperature is 52 to 58 degrees F., mean summer temperature is 70 to 75 degrees F., average annual precipitation is 13 to 15 inches, and frost-free period is 120 to 160 days.
PRINCIPAL ASSOCIATED SOILS: These are thc Collbran, Motoqua, Naplene, and Veyo soils. Collbran nt Motoqua soils have mollic epipedons. Collbran and Naplene soils lack rock fragments. Naplene soils lack argillic horizons. Veyo soils have petrocalcic horizon at depths of 15 to 20 inches.
DRAINAGE AND PERMEABILITY: Well-drained; slow runoff; moderately slow permeability.
USE AND VEGETATION: Used as rangeland. Vegetation is juniper, pinyon, live oak, blackbrush, big sagebrush, service berry, bitterbrush, cliffrose, scrub oak, manzanita, desert almond, galleta, cheatgrass, squirreltail, and Indian ricegrass.
DISTRIBUTION AND EXTENT: Southwestern Utah. Nehar soils are inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Washington County, Utah, 1972.
OSED scanned by NSSQA. Last revised by state 4/72.