LOCATION LARRY MT
Established Series
Rev. LCB-JAL-JCK
05/2013
LARRY SERIES
The Larry series consists of very deep, poorly drained soils that formed in alluvium. These soils are on flood plains, flood-plain steps, drainageways, and stream terraces. Slopes are 0 to 8 percent. Mean annual precipitation is about 457 mm, and mean annual temperature is about 4.4 degrees C.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Typic Endoaquolls
TYPICAL PEDON: Larry clay loam, in meadow grasses (colors are for dry soil unless otherwise noted).
Oa--0 to 5 cm; black (N 2/) muck, very dark gray (N 3/) dry; massive and tightly bound by grass roots; slightly acid (pH 6.5); abrupt smooth boundary. (0 to 5 cm thick)
A--5 to 23 cm; black (N 2/) clay loam, very dark gray (N 3/) dry; moderate fine granular structure; slightly hard, friable, moderately sticky and moderately plastic; common fine roots; many very fine and fine interstitial pores; neutral (pH 7.0); gradual smooth boundary. (18 to 25 cm thick)
Bg--23 to 43 cm; very dark gray (N 3/) clay loam, dark gray (N 4/) dry; moderate medium blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few fine and very fine roots; many very fine tubular pores; neutral (pH 7.0); gradual smooth boundary. (13 to 38 cm thick)
Cg1--43 to 74 cm; gray (N 5/) clay loam, gray (N 6/) dry; light yellowish brown (10YR 6/4) and yellowish brown (10YR 5/4) redox concentrations; massive; hard, friable, moderately sticky and moderately plastic; few roots; 5 percent gravel and 5 percent cobbles; neutral (pH 7.0); gradual smooth boundary. (0 to 64 cm thick)
Cg2--74 to 152 cm; mottled light brownish gray (2.5Y 6/2) and dark gray (N 4/) clay loam; light gray (N 7/) and gray (N 5/) redox depletions; massive; hard, friable, moderately sticky and moderately plastic; few roots; 5 percent gravel and 5 percent cobbles; neutral (pH 7.0)
TYPE LOCATION: Ravalli County, Montana; approximately 183 meters west and 183 meters south of the NE corner of sec. 33, T. 10 N., R. 20 W.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 5.6 to 7.8 degrees C
Mollic epipedon thickness - 25 to 60 cm
Depth to seasonal high water table - 30 to 60 cm
A horizon
Hue: N or 5Y
Value: 3, 4, or 5 dry; 2 or 3 moist
Chroma: 0 or 1
Texture: loam, silt loam, clay loam, or clay
Clay content: 18 to 45 percent
Reaction: pH 6.1 to 7.8
Bg horizon
Hue: N or 10YR
Value: 3, 4, or 5 dry; 2 or 3 moist
Chroma: 0, 1, or 2
Texture: clay loam, silt loam, or loam
Clay content: 18 to 35 percent
Reaction: pH 6.1 to 7.8
Cg horizons
Hue: N, 2.5Y, or 10YR
Value: 4, 5, 6, or 7 dry; 4, 5, or 6 moist
Chroma: 0, 1, or 2
Texture: clay loam, silt loam, or loam with strata of sandy loam
Clay content: 18 to 35 percent clay
Rock fragments: 0 to 35 percent--5 to 25 percent gravel; 0 to 10 percent cobbles
Reaction: pH 6.1 to 7.8
COMPETING SERIES:
Bluffton (MN) - have a cambic horizon; do not have more than 10 percent rock fragments
Flom (MN) - have a cambic horizon; have effervescent masses and gypsum crystals in the subsoil
Mahtowa (MN) - have a cambic horizon; have hues redder than 10YR in the subsoil
Skunkfarm (OR) - do not have strong gleying; do not have rock fragments
Wyard (ND) - do not have strong gleying; have a horizon of secondary calcium carbonate accumulation
GEOGRAPHIC SETTING:
Landform - flood plains, flood-plain steps, drainageways, stream terraces
Elevation - 610 to 1,463 meters
Slope - 0 to 8 percent
Parent material - alluvium
Climate - long, cold winters; moist springs; warm summers
Mean annual precipitation - 381 to 559 mm
Mean annual air temperature - 3.3 to 6.7 degrees C
Frost-free period - 70 to 120 days
GEOGRAPHICALLY ASSOCIATED SOILS: None listed.
DRAINAGE AND PERMEABILITY: Poorly drained; moderate permeability.
USE AND VEGETATION: Larry soils are used mainly for hay and pasture. Potential native vegetation is Bluejoint, Northern reedgrass, tufted hairgrass.
DISTRIBUTION AND EXTENT: Larry soils are of small extent in western and central Montana. MLRAs - 43B, 44B, 46, 58A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Ravalli County (Bitteroot Valley Area), Montana, 1947.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - from 5 to 43 cm (A and Bg horizons)
Strong gleying - from 23 to 152 cm (Bg, Cg1, and Cg2 horizons)
Redoximorphic features - from 43 to 152 cm (Cg1 and Cg2 horizons)
Particle-size control section - from 30 to 105 cm (part of the Bg, Cg1, and Cg2 horizons).
Larry soils have a frigid temperature regime and an aquic moisture regime.
ADDITIONAL DATA: Soil interpretations records: - MT0535, MT0536, MT7018, MT8054, MT8166, and MT0918.
National Cooperative Soil Survey
U.S.A.