LOCATION HUFFINE MT+ID WYEstablished Series
TAXONOMIC CLASS: Fine-silty over sandy or sandy-skeletal, mixed, superactive Ustic Argicryolls
TYPICAL PEDON: Huffine silty clay loam - cropland. (Colors are for dry soil unless otherwise noted)
Ap--0 to 5 inches; dark gray (10YR 4/1) silty clay loam, very dark brown (10YR 2/2) moist; weak thick platy structure parting to moderate medium granular; hard, friable, slightly sticky and slightly plastic; many fine and very fine pores; abrupt boundary. (4 to 8 inches thick)
Bt--5 to 15 inches; dark grayish brown (10YR 4/2) silty clay loam, dark brown (10YR 3/3) moist; weak medium prismatic structure parting to moderate medium subangular blocky; hard, friable, moderately sticky and moderately plastic; many fine and very fine roots and pores; faint continuous clay films on faces of peds; clear wavy boundary. (3 to 11 inches thick)
Bk--15 to 20 inches; light gray (10YR 7/2) silt loam, light brownish gray (10YR 6/2) moist; weak medium and coarse subangular blocky structure; hard, very friable, slightly sticky and slightly plastic; common fine and very fine roots and pores; many soft masses and common filaments of calcium carbonate; violently effervescent; gradual boundary. (3 to 6 inches thick)
Ck1--20 to 24 inches; light brownish gray (10YR 6/2) silt loam, dark grayish brown (10YR 4/2) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; common soft masses of calcium carbonate; violently effervescent; gradual boundary. (3 to 7 inches thick)
Ck2--24 to 35 inches; light gray (2.5Y 7/2) loam, dark grayish brown (2.5Y 4/2) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; 5 percent lime-coated gravel; strongly effervescent; clear boundary. (5 to 12 inches thick)
2C3--35 to 60 inches; multi-colored loose sand and gravel.
TYPE LOCATION: Gallatin County, Montana; 800 feet west and 150 feet south of the NE corner sec. 21, T.2S., R.5E.
RANGE IN CHARACTERISTICS:
Soil temperature - 41 degrees to 47 degrees F.
Depth to carbonates - 9 to 19 inches
Mollic epipedon thickness - 7 to 15 inches
Rock fragments content above the contrasting substrata - 2 to 10 percent
A horizon
Hue: 10YR or 2.5Y
Value: 3 or 4 dry, 2 or 3 moist
Chroma: 1 or 2
Texture: silt loam or silty clay loam
Clay content: 18 to 27 percent
Reaction: pH 6.1 to 7.3
Bt horizon
Hue: 7.5YR to 2.5Y
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 2 or 3
Texture: silt loam or silty clay loam
Clay content: 18 to 35 percent
Reaction: pH 6.1 to 7.3
Bk and Ck horizons
Hue: 10YR or 2.5Y
Value: 6 or 7 dry, 4 to 6 moist
Chroma: 1 to 3
Texture: loam, silt loam or silty clay loam
Clay content: 18 to 27 percent
Calcium carbonate equivalent: 5 to 15 percent
Reaction: pH 7.4 to 8.4
2C horizon
Hue: variegated, 10YR or 2.5Y
Texture: sand or loamy sand
Clay content: 0 to 8 percent
Rock fragments: 55 to 65 percent pebbles, 10 to 15 percent cobbles
Reaction: pH 6.1 to 8.4
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Landform - alluvial fans and stream terraces in mountain valleys
Elevation - 4,000 to 6,000 feet
Slope - 0 to 8 percent
Parent material - silty alluvium or loess
Climate - cool subhumid
Average annual precipitation - 16 to 24 inches
Average annual temperature - 38 to 45 degrees F.
Frost-free period - 70 to 110 days.
DRAINAGE AND PERMEABILITY: Well-drained; moderate permeability
USE AND VEGETATION: Used as dry and irrigated hayland and cropland. Principal native vegetation is bluegrass, Idaho fescue, bluebunch, wheatgrass, rosebush, and cottonwood.
DISTRIBUTION AND EXTENT: Mountain valleys in Montana, Idaho, and Wyoming. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Gallatin County, Montana, 1931.
REMARKS: Diagnostic horizons and features recognized in this pedon are: a mollic epipedon from the surface to 15 inches (Ap and Bt horizons); an argillic horizon which is the particle-size control section from 5 to 15 inches (Bt horizon); accumulation of carbonates from 15 to 35 inches (Bk, Ck1 and Ck2 horizons); a lithologic discontinuity from 35 to 60 inches (2C3 horizon). Huffine soils have a ustic moisture regime and a cryic temperature regime.