LOCATION UVADA UT+NVEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Typic Natrargids
TYPICAL PEDON: Uvada loam - rangeland (Colors are for dry soils unless otherwise noted.)
A1--0 to 2 inches; pinkish white (7.5YR 8/2) loam, light brown (7.5YR 6/4) moist; weak medium platy structure; soft, very friable, slightly sticky, slightly plastic; many very fine and coarse vesicular pores; moderately calcareous; strongly alkaline (pH 8.5); abrupt smooth boundary. (1 to 3 inches thick)
A2--2 to 5 inches; pink (7.5YR 7/4) loam, brown (7.5YR 5/4) moist; weak very thin platy structure that parts to weak fine granular structure; slightly hard, friable, slightly sticky, slightly plastic; common fine vesicular pores; moderately calcareous; strongly alkaline (pH 8.5); abrupt smooth boundary. (2 to 6 inches thick)
Btn1--5 to 10 inches; strong brown (7.5YR 5/6) silty clay loam, brown (7.5YR 4/4) moist; strong medium prismatic structure; hard, sticky, plastic; surface of peds covered with thin, nearly continuous clay films and stained with organic coatings; slightly calcareous and moderately alkaline on the outside of prisms but strongly calcareous and strongly alkaline on the inside (pH 8.5); clear wavy boundary. (3 to 8 inches thick)
Btn2--10 to 18 inches light brown (7.5YR 6/4) silty clay loam, yellowish brown (10YR 5/4) moist; medium subangular blocky structure; hard, firm, sticky, plastic; strongly calcareous; few thin clay films; strongly alkaline (pH 8.6); clear wavy boundary. (5 to 12 inches thick)
C--18 to 60 inches; pink (7.5YR 8/4) clay loam, pink (7.5YR 7/4) moist; massive; hard, friable, sticky, plastic; very strongly calcareous; moderately alkaline (pH 8.2).
TYPE LOCATION: Iron County, Utah; E 1/4 corner of sec. 9, T.35S., and R.15W. .; Clark Farm USGS quad; lat. 37 degrees 51 minutes 39 seconds N. and long. 113 degrees 31 minutes 54 seconds W. NAD 83.
RANGE IN CHARACTERISTICS:
Soil moisture: These soils are dry in all parts of the moisture control section for 75 to 80 percent of the time the soil temperature is above 41 F. Typic aridic soil moisture regime.
Mean annual soil temperature: 49 to 56 F.
Mean summer soil temperature: 67 to 74 F.
Depth to natric horizon: 13 to 43 inches.
Particle-size control section (weighted average):
Clay content: 35 to 60 percent.
Salts: 0.3 to more than 2 percent.
A horizon:
Hue: 10YR or 7.5YR.
Value: 6 to 8 dry and 4 to 6 moist.
Chroma: 2 to 4.
SAR: 5 to 40.
Reaction: Moderately alkaline to very strongly alkaline.
Btn horizon:
Hue: 10YR or 7.5YR.
Value: 5 to 7 dry, and 4 to 6 moist.
Chroma: 2 to 6.
Texture: Silty clay loam or silty clay.
Structure: Moderate or strong, medium or coarse columnar or weak through strong prismatic or is angular blocky.
Calcium carbonate equivalent: 15 to 40 percent.
SAR: 13 to 90.
Reaction: Strongly alkaline or very strongly alkaline.
The C horizon:
Hue: 7.5YR to 2.5Y.
Value:6 to 8 dry, and 5 to 7 moist.
Chroma: 2 to 4.
Texture: Silt loam, silty clay loam or clay loam.
Clay content: 20 to 40 percent.
Structure: Massive or is weak to moderate prismatic parting to angular blocky.
Calcium carbonate equivalent: 10 to 40 percent.
SAR: 30 to 90.
Reaction: Moderately alkaline to very strongly alkaline. Some pedons have stratified silty clay loam and silty clay. Sand and gravelly materials occur below 40 inches in some pedons.
In Nevada the sodium adsorption ratio may range to as high as 300.
COMPETING SERIES: These are the Buckaroo (NV), Calneva (T CA), Effington (WY), Kleinbush (NV), Meeteetse (WY), and Ultra (NV)series. Buckaroo soils have Bk or Bqk horizons with 25 to 60 percent rock fragments. Calneva soils have calcium carbonate equivalent of 2 to 5 percent in the Btnk and Bk horizons. Effington soils have calcium carbonate equivalent less than 15 percent and have secondary gypsum below the natric horizon. Kleinbush soils have a depth to secondary carbonates of 10 to 20 inches, clay or clay loam texture with calcium carbonate equivalent of 5 or less in the natric horizon, and have Bk horizons with 10 to 50 percent rock fragments. Meeteetse soils have Less than 12 percent calcium carbonate equivalent in the Bky and Bnky horizons.Ultra soils have a depth to the base of the natric horizon that ranges from 7 to 13 inches and are not calcareous throughout.
GEOGRAPHIC SETTING: Uvada soils are on nearly level old lake plains at elevations of 4,500 to 6,000 feet. Slope gradients are 0 to 2 percent. The soils formed in lake sediment and deltaic sediments from mixed sedimentary and igneous rocks. The climate is arid. The average annual precipitation ranges from 6 to 9 inches, the mean annual temperature is 47 to 54 F., the mean summer temperature is 67 to 74 F., and the frost-free period ranges from 100 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Antelope Springs and Goshute soils. Antelope Springs soils have less than 35 percent clay in the control section. Goshute soils are underlain by fine gravel and sand at depths of about 20 inches.
DRAINAGE AND PERMEABILITY: Well or moderately well drained; very slow or low runoff; slow or very slow permeability.
USE AND VEGETATION: Used for range by cattle and sheep. The native vegetation is shadscale greasewood, kochia, seepweed, pickleweed, and halogeton.
DISTRIBUTION AND EXTENT: Desert areas of south and central western Utah and Nevada. This series is extensive. MLRA 28A and 24.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Beryl-Enterprise Area Utah, 1942.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: The zone from 0 to 5 inches. (A1 and A2 horizons)
Natric horizon: The zone from 5 to 18 inches. (Btn1 and Btn2 horizons)
Particle-size control section - The zone from 5 to 18 inches (the Btn1 and Btn2 horizon).
The classification is based on the "Keys to Soil Taxonomy, Tenth Edition, 2006".