LOCATION PROBERT UTEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Calcixerolls
TYPICAL PEDON: Probert loam--rangeland. (Colors are for air-dry soil unless otherwise stated).
A--0 to 10 cm; brown (7.5YR 4/2) loam, dark brown (7.5YR 3/2) moist; weak fine granular structure; soft, very friable, slightly sticky, slightly plastic; few very fine vesicular pores; many very fine and fine and few medium roots; slightly effervescent; moderately alkaline (pH 8.0); abrupt smooth boundary. (8 to 13 cm thick)
Bt--10 to 38 cm; brown (7.5YR 4/2) clay loam, dark brown (7.5YR 3/2) moist; weak fine and medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; many very fine and fine roots and few medium roots; few very fine tubular pores; few patchy clay films on faces of peds and in pores; strongly effervescent, (15 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); clear smooth boundary. (0 to 25 cm thick)
Btk--38 to 61 cm; brown (7.5YR 5/4) clay loam, dark brown (7.5YR 3/4) moist; weak fine and medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few very fine and fine roots; few very fine tubular pores; few thin continuous clay films on faces of peds and in pores; strongly effervescent, (33 percent calcium carbonate equivalent), carbonates are in fine nodules; moderately alkaline (pH 8.4); clear smooth boundary. (13 to 25 cm thick)
Bk1--61 to 86 cm; brown (7.5YR 5/4) silty clay loam, brown (7.5YR 4/4) moist; weak fine subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few very fine and fine roots; few very fine and fine tubular pores; 10 percent gravel; violently effervescent, (37 percent calcium carbonate equivalent), carbonates are in fine veins or soft flakes; strongly alkaline (pH 9.0); abrupt smooth boundary. (30 to 51 cm thick)
Bk2--86 to 152 cm; light brown (7.5YR 6/4) fine sandy loam, brown (7.5YR 5/4) moist; weak fine subangular blocky structure parting to weak fine granular; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; few very fine tubular pores; 10 percent gravel; violently effervescent; (33 percent calcium carbonate equivalent); strongly alkaline (pH 9.0); gradual wavy boundary.
TYPE LOCATION: Millard County, Utah, 4 miles south of Scipio Lake, 2,200 feet north and 300 feet east of the southwest corner, sec. 22, T. 20 S., R.2W. latitude 39 degrees 03 minutes 33.7 seconds N and longitude 112 degrees 04 minutes 07.7 seconds W; UTM Zone 12 407526e 4323908n, NAD 83.
RANGE IN CHARACTERISTICS:
Soil moisture: Moist in winter and spring and continuously dry in all parts for significant periods in summer and fall; xeric soil moisture regime.
Mean annual soil temperature: 8.0 to 11.7 degrees C.
Mollic epipedon: 25 to 46 cm thick.
Calcic horizon: 25 to 61 cm deep.
Particle-size control section - Clay content: 27 to 35 percent.
Rock fragments: 5 to 15 percent.
Sand content: More than 15 percent coarser than very fine sand.
A horizon
Hue: 10YR or 7.5YR.
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 2 or 3.
Reaction: Slightly alkaline or moderately alkaline
Bt horizon (absent in some pedons)
Hue: 10YR or 7.5YR.
Value: 4 to 6 dry, 3 to 5 moist.
Chroma: 2 to 4.
Texture: Silty clay loam or clay loam, with more than 15 percent sand coarser than very fine sand.
Reaction : Moderately alkaline or strongly alkaline.
Calcium carbonate equivalent: 10 to 20 percent.
Btk horizon
Hue: 10YR or 7.5YR
Value: 4 to 6 dry, 3 to 5 moist.
Chroma: 2 to 4.
Textures: Silty clay loam or clay loam, with more than 15 percent sand coarser than very fine sand
Reaction: Moderately alkaline or strongly alkaline.
Calcium carbonate equivalent: 25 to 35 percent.
Bk1 horizon
Hue: 10YR or 7.5YR.
Value: 4 to 7 dry, 3 to 5 moist.
Chroma: 2 to 4.
Clay content: 27 to 35 percent.
Rock fragments: 0 to 15 percent.
Calcium carbonate equivalent: 35 to 40 percent.
Reaction: Moderately alkaline or strongly alkaline.
Electrical conductivity (EC): 0 to 4 mmhos/cm.
Bk2 horizon
Hue: 10YR or 7.5YR.
Value: 4 to 7 dry, 3 to 5 moist.
Chroma: 2 to 4.
Clay content: 15 to 20 percent.
Rock fragments: 0 to 15 percent.
Calcium carbonate equivalent: 25 to 35 percent.
Reaction: Moderately alkaline or strongly alkaline.
Electrical conductivity (EC): 0 to 4 mmhos/cm.
COMPETING SERIES: These are the Calita, Samaria and Stoda series.
Calita, Samaria and Stoda soils contain 18 to 27 percent clay in the particle-size control section.
GEOGRAPHIC SETTING:
Landform: fan remnants
Elevation: 1,615 to 2,090 meters
Slopes: 2 to 8 percent
Parent material: mixed alluvium primarily from sandstone, limestone and shale. The climate is dry subhumid.
Mean annual air temperature: 7.0 to 10.6 degrees C.
Mean summer temperature: 17.2 to 18.3 degrees C.
Mean annual precipitation: 300 to 400 mm
Freeze-free period: 100 to 140 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Borvant, Donnardo, Pavant and the competing Calita series. Borvant soils have more than 35 percent coarse fragments and have an indurated carbonate hardpan within a depth of 50 cm. Pavant soils have an indurated carbonate hardpan within a depth of 50 cm. Donnardo, Calita and Scipio soils do not have argillic horizons. Donnardo soils have more than 35 percent rock fragments throughout.
DRAINAGE AND PERMEABILITY: Well drained, slow to medium runoff, moderately slow permeability; moderately high saturated hydraulic conductivity.
USE AND VEGETATION: These soils are used for alfalfa, small grains, improved pasture and range. The native vegetation is dominantly Utah juniper, big sagebrush and Indian ricegrass. These soils have been correlated to Upland range sites in Utah.
DISTRIBUTION AND EXTENT: Central Utah. MLRA 28A. The series is of small extent with 4,950 acres mapped to date.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Millard County, Utah; Millard County, Eastern Part Soil Survey, 1995.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the surface to 38 cm (A and Bt horizons).
Argillic horizon - The zone from 10 to 61 cm (Bt and Btk horizons).
Calcic horizon - The zone from 38 to 152 cm (Btk, Bk1 and Bk2 horizons).
Particle-size control section - The zone from 10 to 60 cm (Bt and part of the Btk horizons).
The classification is based on the "Keys to Soil Taxonomy, Tenth Edition, 2006".