LOCATION PARLO UTEstablished Series
TAXONOMIC CLASS: Fine-silty over sandy or sandy-skeletal, mixed, superactive, mesic Calcic Argixerolls
TYPICAL PEDON: Silt loam - cultivated (Colors are for dry soil unless otherwise noted.)
Ap--0 to 7 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; weak fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; common fine roots; slightly alkaline (pH 7.8); abrupt smooth boundary. (5 to 8 inches thick)
A--7 to 11 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; weak fine subangular blocky structure that parts to weak fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; common fine roots; few fine pores; slightly alkaline (pH 7.8); clear smooth boundary. (3 to 7 inches thick)
Bt1--11 to 15 inches; grayish brown (10YR 5/2) silty clay loam, very dark grayish brown (10YR 3/2) moist; weak medium prismatic structure that parts to moderate fine and medium subangular blocky structure; hard, firm, sticky and plastic; common fine roots; many fine pores; thin continuous clay films; slightly alkaline (pH 7.4); gradual wavy boundary. (5 to 8 inches thick)
Bt2--15 to 21 inches; brown (10YR 5/3) silty clay loam, brown (10YR 4/3) moist; weak medium prismatic structure that parts to moderate fine and medium subangular blocky structure; hard, firm, sticky and plastic; common fine roots; many fine pores; thin continuous clay films; slightly alkaline (pH 7.4); clear wavy boundary. (5 to 10 inches thick)
Ck--21 to 30 inches; pale brown (10YR 6/3) loam, brown (10YR 4/3) moist; massive; hard, friable, slightly sticky and slightly plastic; many fine roots; many fine and few medium pores; strongly calcareous; moderately alkaline (pH 8.4); clear smooth boundary. (5 to 12 inches thick)
2C--30 to 40 inches; pale brown (10YR 6/3) very gravelly loamy sand, brown (10YR 4/3) moist; single grained; loose; common fine roots; moderately calcareous; moderately alkaline (pH 8.4).
TYPE LOCATION: Cache County, Utah; 2 miles north and 1/4 mile west of Paradise Church; 300 feet west of road; 200 feet east and 200 feet south of the NW corner of the NE1/4 sec. 21, T.10N., R.lE.
RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 47 to 52 degrees F. and the mean summer soil temperature ranges from 63 to 68 degrees F. The soils are moist for 55 to 65 percent of the time and are dry in all parts of the 4 to 12 inch section for 60 to 75 consecutive days in the summer and autumn.
The mollic epipedon ranges from 8 to 19 inches thick. The depth to the horizon of carbonate accumulation ranges from 18 to 36 inches. The depth to the very gravelly sand or loamy sand ranges from 24 to 40 inches. Small amounts of gravel are scattered on the surface and in the subsoils of some pedons.
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. It has weak to moderate, fine or medium granuler or subangular blocky structure. This horizon is slightly alkaline or neutral. It is 8 to 19 inches thick.
The Bt horizon has hue of 10YR, 7.5YR or 5YR, value of 4 through 6 dry, 3 or 4 moist, and chroma of 2 through 4. It is silty clay loam, clay loam, or silt loam with less than 35 percent clay and less than 15 percent coarser than very fine sand. This horizon has weak to moderate, fine and medium prismatic and subangular blocky structure. It has many to continuous thin to moderately thick clay films. The Bt horizon is neutral to moderately alkaline. It is 8 to 24 inches thick.
The Ck horizon has hue of 10YR 7.5YR or 5YR, value of 5 through 7 dry, 4 or 5 moist, and chroma of 2 through 4. It is loam or gravelly sandy loam.
The 2C horizon is very gravelly loamy sand or very gravelly sand. The gravel content in the IIC horizon ranges from 35 to 80 percent.
COMPETING SERIES: These are the Bingham, Manderfield, Parleys and Timpanogos series. Bingham and Manderfield soils have more than 15 percent coarser than very fine sand in the upper portion of the control section. Parleys and Timpanogos soils lack contrasting texture changes to very gravelly sand within depth of 40 inches.
GEOGRAPHIC SETTING: Parlo soils are on nearly level to strongly sloping, medium and high lake terraces or stream terraces and have slope gradients of 0 to 10 percent. They formed in mixed lake sediments and alluvium mainly from limestone, sandstone, and quartzite rocks. The climate is dry or moist subhumid. The mean annual temperature ranges from 45 to 52 degrees F. The mean summer temperature ranges from 65 to 73 degrees F. The frost-free period ranges from 100 to 150 days. The average annual precipitation ranges from 14 to 20 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Eastcan, Hillfield, Nibley, Redola and Steed soils and the competing Parleys and Timpanogos soils. All of these soils lack the abrupt texture change to sand or loamy sand at depths less than 40 inches. Eastcan soils have mollic epipedons more than 20 inches thick lack argillic horizons and calcic horizons. Hillfield soils lack mollic epipedons and are silt loam or sandy loam throughout the control section. Nibley soils have argillic horizons with more than 35 percent clay. Redola and Steed soils both lack argillic horizons. Redola soils are coarse-loamy. Steed soils are fragmental in the control section.
DRAINAGE AND PERMEABILITY: Well drained; medium to slow runoff; moderate permeability.
USE AND VEGETATION: Used mostly for cropland; alfalfa, small grains, and pasture are the main crops. The native vegetation is largely bluebunch wheatgrass, western wheatgrass, balsamroot and sagebrush.
DISTRIBUTION AND EXTENT: Lake terraces and stream terraces in northern Utah. This series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Cache County, Utah, 1972.
REMARKS: 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.