LOCATION JASSEEK IDEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Aridic Argixerolls
TYPICAL PEDON: Jasseek loam -- on a nearly level basin-floor remnant, in irrigated hayland at 2,640 feet elevation. When described on September 6, 1994, the soil was slightly moist throughout. (Colors are for air-dried soil unless otherwise stated.)
Ap--0 to 7 inches; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; moderate thin and medium platy structure parting to moderate fine subangular blocky; slightly hard, friable, moderately sticky and moderately plastic; many very fine and fine, few medium and coarse roots; many very fine and fine, few medium irregular pores; neutral (pH 6.7); clear smooth boundary.
A--7 to 10 inches; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common very fine and fine, few medium and coarse roots; many very fine and fine, few medium tubular and irregular pores; neutral (pH 6.8); abrupt wavy boundary. (combined A horizon - 6 to 12 inches thick)
Bt1--10 to 18 inches; brown (10YR 5/3) clay loam, dark brown (10YR 3/3) moist; moderate fine and medium prismatic structure parting to strong fine and medium angular blocky; very hard, very firm, moderately sticky and moderately plastic; few very fine, fine and medium roots; common very fine and fine, few medium tubular pores; many distinct clay films on faces of peds and in pores; neutral (pH 6.8); abrupt wavy boundary. (4 to 8 inches thick)
Bt2--18 to 27 inches; brown (10YR 5/3) clay, brown (10YR 4/3) moist; strong fine and medium prismatic structure; very hard, very firm, very sticky and very plastic; few very fine, fine and medium roots; common very fine and fine, few medium tubular pores; many prominent clay films on faces of peds and in pores, few distinct stress surfaces; neutral (pH 6.8); clear smooth boundary. (10 to 20 inches thick)
Bt3--27 to 33 inches; pale brown (10YR 6/3) clay loam, brown (10YR 4/3) moist; weak fine and medium prismatic structure parting to moderate fine and medium angular blocky; very hard, firm, moderately sticky and moderately plastic; few very fine and fine roots; few very fine and fine tubular pores; common prominent clay films on faces of peds and in pores, few distinct stress surfaces; neutral (pH 6.9); abrupt wavy boundary. (0 to 10 inches thick)
Bt4--33 to 43 inches; pale brown (10YR 6/3) sandy clay loam, brown (10YR 4/3) moist; weak fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine roots; few very fine and fine tubular pores; common faint clay films on rock fragments and clay bridges between sand grains; neutral (pH 7.0); abrupt smooth boundary. (6 to 24 inches thick)
2C--43 to 60 inches; light yellowish brown (10YR 6/4) loamy sand, brown (10YR 5/3) moist; single grain; loose; neutral (pH 7.1).
TYPE LOCATION: Boise County, Idaho; about 1.5 miles northeast of Horseshoe Bend; 1,800 feet west and 150 feet south of the northeast corner of section 23, T.7 N., R.2 E.; USGS Horseshoe Bend Quadrangle; Latitude - 43 degrees, 56 minutes, 11 seconds N. and Longitude - 116 degrees, 10 minutes, 56 seconds W.; NAD 83.
RANGE IN CHARACTERISTICS:
Mollic epipedon thickness - 10 to 20 inches
Depth to discontinuity - 40 to 60 inches
Depth to bedrock - 60 inches or more
Reaction - slightly acid or neutral
Moisture control section - moist less than 90 consecutive days when the soil temperature is greater than 47 degrees F.
Average annual soil temperature - 52 to 53 degrees F.
A horizon
Chroma - 2 or 3 dry or moist
Bt horizon (upper part)
Chroma - 2 or 3 dry or moist
Texture - CL or SICL
Clay content - 27 to 35 percent
Bt horizon (middle part)
Value - 5 or 6 dry
Chroma - 2 or 3 dry or moist
Texture - C or CL
Clay content - 35 to 45 percent
Rock fragments 0 to 5 percent gravel
Bt horizon (lower part)
Chroma - 3 or 4 dry or moist
Texture - CL, L or SCL
Clay content - 22 to 35 percent
Rock fragments - 0 to 10 percent gravel
2C horizon
Value - 6 or 7 dry, 5 or 6 moist
Chroma - 3 or 4 dry or moist
Texture - LS or SL
Clay content - 5 to 20 percent
Rock fragments - 0 to 35 percent gravel, 0 to 5 percent cobbles and 0 to 35 percent total
COMPETING SERIES: These are the Brownscombe, Bucklake, Cagle, Correco, Holmzie, Northmore, Perla, Schoer, Sherar, Wicup and Zymans series. Brownscombe, Cagle, Holmzie, Sherar and Wicup soils are 20 to 40 inches deep to a paralithic contact. Bucklake and Perla soils are 20 to 40 inches deep to a lithic contact. Correco soils have an average annual soil temperature of 48 to 50 degrees F. Northmore soils contain more than 45 percent sand in the particle-size control section and have Btq horizons with 15 percent durinodes. Schoer soils are less than 30 inches to the base of the argillic horizon and are slightly or moderately alkaline within the argillic horizon. Zymans are 40 to greater than 60 inches to a paralithic contact and have Bk horizons.
GEOGRAPHIC SETTING: Jasseek soils are nearly level to moderately sloping on relict lake terraces at elevations of 2,600 to 2,800 feet. These soils formed in alluvium from lacustrine sediments over alluvium from igneous (dominantly granitic) rocks. Slopes range from 1 to 8 percent. The average annual precipitation ranges from 13 to 14 inches. The average annual temperature ranges from 50 to 51 degrees F. The frost-free period is 140 to 150 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bissell, Boise and Piercepark soils. Boise soils are coarse-loamy and on alluvial fans. Bissell and Piercepark soils are fine-loamy and on fan remnants.
DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; slow permeability.
USE AND VEGETATION: Jasseek soils are used mainly for irrigated hayland/pasture and cropland (small grains). Some areas are used for homesites. A few small areas are used for rangeland. Native vegetation is basin big sagebrush, bluebunch wheatgrass and basin wildrye.
DISTRIBUTION AND EXTENT: Southwestern Idaho. MLRA 11. Jasseek soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Boise County Area, Idaho, Parts of Ada and Boise Counties, 2005.
REMARKS: Diagnostic horizons and features recognized in this pedon
Mollic epipedon - zone 0 to 18 inches (Ap, A and Bt1 horizons)
Argillic horizon - zone 10 to 43 inches (Bt horizons)
Particle-size control section - zone 10 to 30 inches
Soil moisture regime - aridic bordering on xeric
These soils are drier than other Xerolls in the region under similar precipitation due to early runoff and extended period of high evapotranspiration.