LOCATION DOYCE UTEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Calcic Argixerolls
TYPICAL PEDON: Doyce loam--rangeland. (Colors are for air-dry soil unless otherwise stated).
A1--0 to 2 inches; brown (7.5YR 4/3) loam, dark brown (7.5YR 3/3) moist; moderate thin platy structure; slightly hard, very friable, nonsticky and slightly plastic; few very fine pores; many very fine roots; mildly alkaline (pH 7.8); abrupt smooth boundary. (2 to 3 inches thick)
A2--2 to 10 inches; brown (7.5YR 5/3) loam, dark brown (7.5YR 3/3) moist; the upper 3 inches has weak medium platy structure parting to moderate medium granular, below is weak fine subangular blocky structure; slightly hard, friable, slightly sticky and plastic; common very fine roots; common fine pores; mildly alkaline (pH 7.8); clear smooth boundary. (7 to 9 inches thick)
Btk1--10 to 16 inches; brown (7.5YR 5/3) sandy clay loam, dark brown (7.5YR 4/3) moist; strong medium angular blocky structure; very hard, firm, sticky and plastic; few very fine roots; few very fine pores; few thin clay films in pores and on peds; strongly effervescent, carbonates are in fine nodules; moderately alkaline (pH 8.0); clear smooth boundary. (4 to 7 inches thick)
Btk2--16 to 20 inches; light brown (7.5YR 6/4) sandy clay loam, dark brown (7.5YR 4/4) moist; moderate medium angular blocky structure; very hard, firm, sticky and plastic; few very fine roots; few very fine and few coarse pores; very few thin clay films mainly in pores; strongly effervescent, carbonates are in fine veins or soft flakes; moderately alkaline (pH 8.4); clear smooth boundary. (0 to 6 inches thick)
Bk1--20 to 32 inches; light brown (7.5YR 6/4) sandy clay loam, dark brown (7.5YR 4/3) moist; massive; very hard, firm, slightly sticky and plastic; few fine and very fine roots; few very fine pores; 10 percent gravel; violently effervescent; carbonates are in fine veins, fine nodules and segregated on the coarse fragments; strongly alkaline (pH 8.6); gradual wavy boundary. (10 to 15 inches thick)
Bk2--32 to 44 inches; light brown (7.5YR 6/3) cobbly sandy clay loam, dark brown (7.5YR 4/3) moist; massive; very hard, firm, sticky and plastic; few fine and very fine roots; few very fine pores; 35 percent coarse fragments, dominantly cobbles and stones; violent effervescence; carbonates are disseminated and in veins, also 1/4 inch thick coatings on coarse fragments; strongly alkaline (pH 8.5); abrupt wavy boundary. (6 to 15 inches thick)
C1--44 to 48 inches; pink (7.5YR 7/3) loam, brown (7.5YR 5/3) moist; massive and very compacted; extremely hard, firm; nonsticky and nonplastic; few very fine discontinuous pores; violently effervescent; carbonates are disseminated and in fine nodules; strongly alkaline (pH 8.8); abrupt smooth boundary. (0 to 4 inches thick)
C2--48 to 60 inches; pinkish white (10YR 8/3) stony loam, light brown (10YR 6/3) moist; massive; very hard, friable, slightly sticky and plastic; common very fine pores; violently effervescent; carbonates are disseminated and in veins or nodules and segregated on coarse fragments; strongly alkaline (pH 9.0).
TYPE LOCATION: Sanpete County, Utah, southeast of Spring City in the Denmark Cedars, 1,650 feet north and 250 feet east of the southwest corner, sec. 8, T. 16 S., R. 4 E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 47 to 53 degrees F. Soil moisture regimes is Xeric bordering on Aridic.
The mollic epipedon is 10 to 12 inches thick. Secondary carbonate is at a depth of 10 to 24 inches thick.
The A horizon has hue of 10YR or 7.5YR, value of 4 or 5 dry, 2 or 3 moist and chroma of 2 or 3. Texture is a loam or fine sandy loam. Rock fragment content is 0 to 15 percent. Reaction is neutral to moderately alkaline.
The Btk has hue of 10YR or 7.5YR, value of 4 to 7 dry, 3 to 5 moist and chroma of 2 or 4. Clay content is 20 to 35 percent. Textures are sandy clay loam, loam, or clay loam with more than 15 percent sand coarser than very fine sand. Rock fragment content is 0 to 15 percent. Reaction is neutral to moderately alkaline. Calcium carbonate equivalent is 3 to 15 percent. In some pedons, the upper part of the argillic horizon is leached of carbonates.
The Bk horizon has hue of 10YR or 7.5YR, value of 6 to 8 dry, 4 to 6 moist, and chroma of 3 or 4. Clay content is 18 to 27 percent. Rock fragment content is 0 to 35 percent. Texture is sandy clay loam, sandy loam, silt loam, cobbly sandy clay loam, loam or cobbly loam. Calcium carbonate equivalent ranges from 15 to 40 percent. Reaction is moderately alkaline or strongly alkaline. Electrical conductivity of the saturation extract is 0 to 4 mmhos/cm.
The C horizon has hue of 10YR and 7.5YR, value of 6 to 8 dry, 4 to 6 moist, and chroma of 3 or 4. Rock fragment content is 0 to 35 percent. Reaction is moderately alkaline to strongly alkaline. Calcium carbonate equivalent is 10 to 30 percent. Electrical conductivity of the saturation extract is 0 to 4 mmhos/cm.
COMPETING SERIES: These are the Colockum (WA), Hack (OR), Lucero (UT), Polly (OR), Pollynot T(ID), Timpanogos (UT), and Tirod T(ID) series. Colockum soils have a lithological discontinuity at 47 inches and are formed in loess and volcanic ash. Hack soils have calcareous horizons with less than 15 percent calcium carbonate equivalent. Lucero soils have 20 to 35 percent rock fragments in the control section. Polly soils contain horizons in particle size control section of more than 15 percent rock fragments and have 5YR colors. Pollynot soils do not have Btk horizons and have lithological discontinuities of loamy fine sand at 44 inches. Timpanogos soils have a water table from 40 to 60 inches. Tirod soils do not have Btk horizons and have a depth of calcic horizon of 35 inches.
GEOGRAPHIC SETTING: The Doyce soils are on gently to strongly sloping fan terraces at elevations of 4,800 to 7,000 feet. Slopes range from 2 to 15 percent. They formed in mixed alluvium from sandstone, limestone, and shale and igneous rocks. The climate is dry subhumid. Mean annual temperature ranges from 45 to 51 degrees F. Mean summer temperature is 63 to 65 degrees F. Average annual precipitation ranges from 12 to 14 inches and the freeze-free period is 90 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Borvant, Calita, Donnardo, Juab, Pavant and Mountainville soils. Borvant soils have more than 35 percent coarse fragments and have indurated carbonate hardpans within a depth of 20 inches. Pavant soils have indurated carbonate hardpan within a depth of 20 inches. Donnardo, Calita and Juab soils lack argillic horizons. Donnardo soils have more than 35 percent rock fragments throughout. Mountainville soils have very strong clay loam Bt horizons.
DRAINAGE AND PERMEABILITY: Well drained, slow to medium runoff, moderately slow permeability.
USE AND VEGETATION: These soils are used for alfalfa, small grains and improved pasture. The native vegetation is dominantly juniper, big sagebrush, cheatgrass, and Indian ricegrass.
DISTRIBUTION AND EXTENT: Central Utah. The series is moderately extensive. MLRA 28A and 47.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Sanpete Area, Utah, 1971.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone of dark colored soil material from the surface to a depth of 10 inches. (A1, A2 horizons)
Argillic horizon - the zone of clay accumulation from a depth of 10 to 20 inches. (Bt and Btk horizons)
Calcic horizon -the zone from 20 to 44 inches. (Bk horizons)
These soils were reclassified from Aridic Calcic Argixerolls to Calcic Argixerolls in 9/94 based on a 12 to 14 inch precipitation and upland range site.
The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.