LOCATION DEMNER UT

Established Series
Rev. AJE/RJL/SJJ
07/2014

DEMNER SERIES

The Demner series consists of very deep, well drained soils that formed in alluvium, slope alluvium and colluvium derived from basic and intermediate igneous rocks. Demner soils occur on alluvial fans and mountain slopes. Slopes are 2 to 70 percent. The average annual precipitation is about 350 mm and the mean annual air temperature is 5.5 degrees C.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Calcic Pachic Argixerolls

TYPICAL PEDON: Demner cobbly sandy loam, rangeland. (Colors are for air dry soil unless otherwise noted.) The surface is covered with about 20 percent gravel, 10 percent cobbles and 1 percent stones.

A--0 to 10 cm; grayish brown (10YR 5/2) cobbly sandy loam, very dark brown (10YR 2/2), moist; weak fine and medium granular structure; soft, very friable, slightly sticky, slightly plastic; many very fine and fine, common medium and few coarse roots; common very fine and fine tubular pores; 19 percent gravel, 15 percent cobbles; noneffervescent; neutral (pH 7.2); abrupt wavy boundary. (10 to 25 cm thick)

Bt1--10 to 21 cm; brown (10YR 5/3), gravelly fine sandy loam, very dark grayish brown (10YR 3/2), moist; moderate medium granular structure; slightly hard, friable, slightly sticky, slightly plastic; many very fine and fine, common medium and few coarse roots; common very fine and fine tubular pores; few discontinuous distinct clay films on all faces of peds; 20 percent gravel, 10 percent cobbles; noneffervescent; slightly alkaline (pH 7.5); clear wavy boundary.

Bt2--21 to 51 cm; brown (7.5YR 5/3), extremely gravelly sandy loam, dark brown (7.5YR 3/2), moist; moderate medium and coarse subangular blocky structure; hard, firm, slightly sticky, slightly plastic; common very fine and fine and few medium roots; common very fine and few fine tubular pores; few discontinuous distinct clay films on all faces of peds; 45 percent gravel, 24 percent cobbles; noneffervescent; slightly alkaline (pH 7.6); abrupt wavy boundary. (combined thickness of the Bt horizon is 35 to 58 cm)

Bk--51 to 80 cm; yellowish brown (10YR 5/4), extremely gravelly loamy coarse sand, dark yellowish brown (10YR 4/4), moist; single grain; loose, nonsticky, nonplastic; common very fine and fine roots; 54 percent gravel, 20 percent cobbles; noneffervescent matrix, few discontinuous prominent carbonate coats on bottom surfaces of rock fragments; moderately alkaline (pH 7.9); abrupt irregular boundary. (23 to 29 cm thick)

C1--80 to 115 cm; yellowish brown (10YR 5/4), extremely stony loamy coarse sand, dark yellowish brown (10YR 4/4), moist; single grain; loose; common very fine and few fine roots; 38 percent gravel, 15 percent cobbles, 20 percent stones; noneffervescent; moderately alkaline (pH 8.2); abrupt irregular boundary.

C2--115 to 160 cm; light yellowish brown (10YR 6/4), extremely cobbly loamy coarse sand, yellowish brown (10YR 5/4), moist; single grain; loose, nonsticky, nonplastic; few very fine and fine roots; 47 percent gravel, 20 percent cobbles, 10 percent stones; noneffervescent; moderately alkaline (pH 8.2).

TYPE LOCATION: Sevier County, Utah; 1 mile south and 1 mile east of the Koosharem Reservoir; 1,300 feet east and 400 feet south of the northwest corner of section 5, T.26S., R.1E., SLBM.; USGS Burrville 7.5 minute quadrangle; lat. 38 degrees 35 minutes 2.1 second N. and long. 111 degrees 49 minutes 35 seconds W., NAD 83.

RANGE IN CHARACTERISTICS:

Soil moisture: These soils are moist in winter and spring and continuously dry in all parts for significant periods in summer and fall. (Xeric bordering on aridic soil moisture regime).
Mean annual soil temperature: 5.0 to 8.0 degrees C
Mean summer soil temperature: 18 to 19.5 degrees C
Thickness of the mollic epipedon: 50 to 63 cm

Particle-size control section (weighted average):
Clay content: 14 to 30 percent
Rock fragments: 35 to 60 percent; of andesite, dacite, basalt, and tuff origin

A horizon:
Hue: 10YR or 7.5YR
Value: 4 or 5 dry
Chroma: 2 or 3 dry or moist
Texture: Loam or sandy loam
Rock fragments: 15 to 60 percent gravel and cobbles. Some pedons have a few stones.
Reaction: Neutral or slightly alkaline

Bt horizon:
Hue: 10YR or 7.5YR
Chroma: 2 or 3 dry or moist
Texture: fine sandy loam, sandy loam, sandy clay loam, or loam modified by rock fragments
Clay content: 14 to 30 percent
Rock fragments: 35 to 60 percent gravel and cobbles. Some pedons have a few stones.
Reaction: Neutral or slightly alkaline

Bk and C horizon:
Hue: 10YR or 7.5YR
Value: 5 or 6 dry, 3 or 4 moist
Chroma: 2 or 3 dry or moist
Texture: Loamy coarse sand, sand, loam, sandy clay loam, or sandy loam modified by rock fragments
Clay content: 1 to 20 percent
Rock fragments: 35 to 80 percent gravel, cobbles and stones
Reaction: Slightly alkaline or moderately alkaline
Carbonates: Noncalcareous to slightly calcareous matrix; calcium carbonate equivalent 0 to 5 percent.
Identifiable secondary carbonates in Bk horizons: Few to common masses and concretions on bottom of rock fragments.

COMPETING SERIES: These are the Nomara (NV) and Rypod (UT) series.
Nomara soils are 50 to 100 cm deep to bedrock.
Rypod soils have a calcic horizon with a calcium carbonate equivalent of 10 to 20 percent in the Bk horizons.

GEOGRAPHIC SETTING:
Parent material: Slope alluvium, alluvium and colluvium derived from andesite, dacite, basalt, and tuff
Landform: Alluvial fans and mountain slopes
Slopes: 2 to 70 percent
Elevation: 5,850 to 9,285 feet (1,780 to 2,830 m)
Climate: Dry subhumid
Mean annual precipitation: 12 to 16 inches (300 to 400 mm)
Mean annual temperature: 39 to 45 degrees F (4 to 7 degrees C).
Frost-free period: 70 to 100 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bock and Eldgin soils. Bock and Eldgin soils do not have a mollic epipedon more than 50 cm (20 inches) thick and have less than 35 percent rock fragments in the particle-size control section. In addition Bock soils do not have an argillic horizon.

DRAINAGE AND PERMEABILITY: Well drained; slow to high runoff; moderate permeability; moderately high or high Ksat class.

USE AND VEGETATION: These soils are used for irrigated cropland and range. The native vegetation is big sagebrush, Indian ricegrass, bluebunch wheatgrass, needleandthread, pinyon pine, and Utah Juniper. The irrigated crops are pasture, alfalfa, barley and oats.

DISTRIBUTION AND EXTENT: Central Utah, Grass Valley in Sevier and Piute Counties and southern Sevier County, MLRA 47. The series is inextensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana

SERIES ESTABLISHED: Sevier County Area, Utah, UT628, 2009.

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 10 to 51 cm.
Mollic epipedon: The zone from 0 to 51 cm. (A, Bt horizons)
Argillic horizon: The zone from 10 to 51 cm. (Bt horizon)
Calcic Pachic feature: A mollic epipedon thicker than 50 cm and secondary carbonates within a depth of 110 cm.

The assignment of the cation-exchange activity class is supported by lab sample numbers 93UT041003.

Classification is based on 11th edition Keys to Soil Taxonomy, 2010.

National Cooperative Soil Survey
U.S.A.