LOCATION CONGLE IDEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Pachic Ultic Haploxerolls
TYPICAL PEDON: Congle gravelly loam - on a northeast-facing slope of 25 percent under native rangeland vegetation at 5,600 feet elevation. (Colors are for dry soil unless otherwise stated.) When described on October 3, 1977, the soil profile was dry.
A--0 to 4 inches; dark brown (10YR 4/3) gravelly loam, black (10YR 2/1) moist; weak fine platy structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine and fine tubular pores; 15 percent gravel; neutral (pH 6.6); clear smooth boundary. (4 to 10 inches thick)
Bw1--4 to 11 inches; dark brown (10YR 3/3) gravelly loam, very dark brown (10YR 2/2) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine tubular pores; 15 percent gravel; neutral (pH 6.6); clear smooth boundary. (6 to 17 inches thick)
Bw2--11 to 42 inches; dark brown (10YR 3/3) gravelly clay loam, black (10YR 2/1) moist; moderate medium subangular blocky structure; hard, firm, sticky and plastic; common very fine and fine roots; common very fine and fine tubular pores; 15 percent gravel; neutral (pH 6.8); abrupt smooth boundary. (10 to 31 inches thick)
Bw3--42 to 62 inches; light yellowish brown (10YR 6/4) gravelly clay loam, dark brown (10YR 4/3) moist; moderate medium subangular blocky structure; hard, firm, sticky and plastic; few very fine and fine roots; common very fine tubular pores; 25 percent gravel; neutral (pH 7.0).
TYPE LOCATION: Twin Falls County, Idaho; about 12 miles east of Hollister, Idaho; in the southwest 1/4, southwest 1/4, northeast 1/4, section 34, T. 12 S., R. 18 E.
RANGE IN CHARACTERISTICS:
Depth to welded tuff or ash - more than 60 inches
Rock fragments in control section - 5 to 30 percent
Solum reaction - neutral or slightly acid
Average clay content in control section - 30 to 35 percent
Average annual soil temperature - 44 to 47 degrees F.
Mollic epipedon - 20 to 42 inches
Base saturation - 60 to 70 percent in the upper 30 inches
A horizon
Value - 3 or 4 dry, 2 or 3 moist
Chroma - 1 through 3 dry or moist
Granular or platy structure
Bw horizon
Value - 3 through 6 dry, 2 or 3 moist
Chroma - 1 through 4 dry or moist
Textures - CL, GR-CL, GR-L, or GR-SICL
Subangular blocky or prismatic structure
COMPETING SERIES: These are the Buford (T), Childs, Harahill, Kahler, McGarr, and Tournquist (T) series. Buford soils are deep to bedrock and have 18 to 27 percent clay in the particle-size control section. Childs soils are strongly and medium acid, and have an average annual precipitation of 45 to 60 inches. Harahill and McGarr soils are 20 to 40 inches deep to bedrock. Kahler soils have 18 to 30 percent clay in the control section. Tournquist soils have a hue of 5YR or 2.5YR in the B horizon.
GEOGRAPHIC SETTING: Congle soils are on backslopes and footslopes The slope range is 8 to 30 percent. The soils formed in colluvium from welded tuff and volcanic ash. Elevations are 4,800 to 6,400 feet. The average annual precipitation ranges from 13 to 20 inches. The average annual temperature is 42 to 45 degrees F. The frost free season is 80 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Amboat, Brose, Doodlelink, Oshone, Stricker, and Tucker soils. Amboat and Brose soils are on summits. Amboat soils are clayey-skeletal. Brose soils are shallow to welded tuff. Doodlelink soils are on the same landscape but are loamy-skeletal. Oshone soils are on terraces below the Congle soil on the landscape, and are moderately deep to a hardpan. Stricker soils occur on the same landscape but at lower elevations, and are loamy-skeletal. Tucker soils occur on lower terraces, are fine, and somewhat poorly drained.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderately slow permeability.
USE AND VEGETATION: Congle soils are used for rangeland. Native vegetation is Idaho fescue, bluebunch wheatgrass, and mountain big sagebrush, and rabbitbrush.
DISTRIBUTION AND EXTENT: Congle soils are of small extent in south central Idaho.
MLRA OFFICE RESPONSIBLE: Reno, Nevada
SERIES ESTABLISHED: Twin Falls County, Idaho, 1992.
REMARKS: Base saturation: 0-4"-65%; 4-11"-68%;11-42"-70%.
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - 0 to 42 inches
Pachic feature - mollic thicker than 20 inches
Ultic feature - less than 75 percent base saturation in the upper 40 inches
Particle-size control section - 10 to 40 inches
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.