LOCATION PANIOGUE IDEstablished Series
TAXONOMIC CLASS: Coarse-loamy over sandy or sandy-skeletal, mixed, superactive, mesic Xeric Haplocalcids
TYPICAL PEDON: Paniogue loam-rangeland. (Colors are for dry soil unless otherwise noted)
A--0 to 3 inches; grayish brown (2.5Y 5/2) loam, very dark grayish brown (1OYR 3/2) moist; weak very thin platy structure, which parts to weak very fine granular structure; soft, very friable, nonsticky, slightly plastic; many very fine and fine roots; many very fine irregular pores; mildly alkaline (pH 7.5); abrupt smooth boundary. (2 to 4 inches thick)
AB--3 to 7 inches; light brownish gray (10YR 6/2) loam, very dark grayish brown (10YR 3/2) (dark grayish brown, 10YR 4/2 crushed) moist; weak very thin platy structure that parts to weak very fine granular structure; slightly hard, very friable, nonsticky, slightly plastic; many very fine and fine roots; few very fine tubular pores; mildly alkaline (pH 7.8); abrupt wavy boundary. (2 to 5 inches thick)
Bwl--7 to 14 inches; light brownish gray (10YR 6/2) (pale brown, 10YR 6/3 crushed) silt loam, dark grayish brown (10YR 4/2) moist; weak coarse prismatic structure that parts to weak medium and coarse subangular blocky structure; slightly hard, very friable, slightly sticky, slightly plastic; many very fine and fine roots; common very fine tubular pores; mildly alkaline (pH 7.8); abrupt wavy boundary. (5 to 9 inches thick)
Bw2--14 to 18 inches; light brownish gray (10YR 6/2) silt loam, dark grayish brown (10YR 4/2) moist; weak coarse subangular blocky structure; many very fine and fine roots; common very fine and fine tubular pores; slightly effervescent; moderately alkaline (pH 8.0); clear wavy boundary. (3 to 8 inches thick)
Bk1-- 18 to 28 inches; light gray (2.5Y 7/2) silt loam, grayish brown (10YR 5/2) moist; weak medium and coarse subangular blocky structure; massive in lower part; hard, firm, slightly sticky, slightly plastic; few very fine and fine roots; few very fine tubular pores; lower part contains 10 percent very hard rounded nodules or (cicada) krotovinas about 0.8 inch in diameter; 3 percent fine gravel; strongly effervescent; common 0.5 inch splotches and few fine spots and veins of lime; moderately alkaline (pH 8.3); abrupt smooth boundary. (6 to 18 inches thick)
2Bk2--28 to 31 inches; white (10YR 8/2) coarse sandy loam, light brownish gray (10YR 6/2) moist; massive; hard, friable; few very fine and fine roots; few very fine tubular pores; 5 percent fine gravel; violently effervescent, many fine lime spots and coatings; moderately alkaline (pH 8.4); abrupt smooth boundary. (0 to 5 inches thick)
3Bk3--31 to 47 inches; light brownish gray (10YR 6/2) coarse sand, grayish brown (10YR 5/2) moist; single grained; loose; few very fine and coarse roots; 5 percent gravel; strongly effervescent; strongly alkaline (pH 8.8); clear wavy boundary. (7 to 16 inches thick)
4Bk4--47 to 60 inches; multi-colored gravelly very coarse sand; single grained; loose; few very fine roots; 20 percent fine gravel; pebbles slightly lime-coated on lower side; slightly effervescent; strongly alkaline (pH 8.6)
TYPE LOCATION: Power County, Idaho; 10 feet north of road; about 3 miles west of Pocatello airport; level terrace at 4,450 feet elevation; about 500 feet west and 300 feet south of the center of section 14, T. 6 S., T. 32 E.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 47 to 56 degrees F.
Depth to contrasting textures - 20 to 40 inches
Depth to secondary carbonate - 12 to 25 inches
Control section - Clay content - 6 to 14 percent
A horizon (or upper 7 inch layer when mixed)
Hue - 10YR or 2.5 YR
Value - 5 or 6 dry, 3 or 4 moist, but not both 5 dry and 3 moist Chroma - 2 or 3 dry or moist
Organic matter - 0.8 to 2 percent
Structure - weak or moderate platy, weak very fine granular massive Reaction - neutral to moderately alkaline
Bw horizon
Value - 5 through 7 dry, 4 or 5 moist
Chroma - 2 or 3 dry or moist
Texture - L, SIL, VFSL
Structure - Weak prismatic or weak subangular blocky
Reaction - mildly through strongly alkaline, noneffervescent to strongly effervescent
Bk horizons
Lime content - 15 to 30 percent in some part
Exchangeable sodium - 15 to 65 percent in some pedons
Nodules - few or common hard or very hard in most pedons
Textures - VCOS, COS, S, FS, GR
COMPETING SERIES: This is the Ephrata series. Ephrata soils are moderately coarse textured and lack calcic horizons.
GEOGRAPHIC SETTING: The Paniogue soils are on level to sloping, moderate or high terraces and alluvial fans. Slopes range from 0 to 20 percent. Elevations are mostly between 2,100 to 5,000 feet. The soils formed in alluvium from mixed sources but mostly from sedimentary rock, but the upper part probably contains much loessal material. The climate is semiarid. Average annual precipitation is 8 to 12 inches, including 1.5 to 3 feet of snow. The average annual temperature is 45 to 51 degrees F. The frost free season is 100 to 155 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Broncho, Declo, and Portneuf series and the Chedahap, Clems, Escalante, Greenleaf, Power and Purdam series. Chedehap, Clems, and Escalante soils are moderately coarse textured and lack contrasting textures above a depth at 40 inches. Greenleaf soils have a moderately fine textured subsoil over laminated silts. Power and Purdam soils have argillic horizons over duripans that are deep, very deep, or moderately deep.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability in the upper part and very rapid in the lower part.
USE AND VEGETATION: Used for production of alfalfa, potatoes, sugar beets, small grains, and pasture under irrigation. Some areas are used for rangeland. Principal native plants are Wyoming big sagebrush, bluebunch wheatgrass, Sandberg bluegrass, and in places rabbitbrush or greasewood.
DISTRIBUTION AND EXTENT: Southern Idaho. Moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Power County, Idaho, 1972
REMARKS: Diagnostic horizon and features recognized in this pedon are:
Ochric epipedon - surface to 7 inches (A and AB horizons)
Cambic horizon - 7 to 18 inches (Bw1 and Bw2 horizons)
Calcic horizon - 18 to 47 inches (Bk1, Bk2 and 3Bk3 horizons)
Strongly contrasting particle size class - coarse sand at 31 inches