LOCATION REYCREEK MTEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Aridic Natrustolls
TYPICAL PEDON: Reycreek loam, in rangeland (colors are for dry soil unless otherwise noted).
A--0 to 6 inches; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine and few medium roots; many very fine, common fine and few medium pores; strongly effervescent; moderately alkaline (pH 8.2); clear smooth boundary. (4 to 8 inches thick)
Btn--6 to 20 inches; light brownish gray (10YR 6/2) silty clay loam, dark brown (10YR 3/3) moist; moderate medium prismatic structure parting to moderate medium subangular blocky; hard, friable, very sticky and very plastic; common very fine and fine and few medium roots; many very fine, common fine and few medium pores; common faint clay films on faces of peds and lining pores; strongly effervescent; very strongly alkaline (pH 9.2); clear smooth boundary. (5 to 16 inches thick)
Bkn--20 to 36 inches; light brownish gray (10YR 6/2) silty clay loam, dark brown (10YR 3/3) moist; weak medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; many very fine and few medium roots; common fine and few medium pores; common fine masses of lime; violently effervescent; strongly alkaline (pH 8.6); clear wavy boundary. (8 to 20 inches thick)
Bkg--36 to 60 inches; gray (10YR 6/1) silty clay loam, grayish brown (10YR 5/2) moist; weak coarse subangular blocky structure; hard, firm, very sticky and very plastic; few very fine roots; few very fine, fine and medium pores; violently effervescent, common medium masses of lime; strongly alkaline (pH 8.6).
TYPE LOCATION: Gallatin County, Montana; 500 feet south and 1700 feet west of the northeast corner of section 9, T.1S., R.2E.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 43 to 47 degrees F.
Moisture control section - between 4 and 12 inches, dry in all parts between four tenths and five tenths of the cumulative days when the soil temperature at a depth of 20 inches is higher than 41 degrees F.; not dry for 45 consecutive days.
Mollic epipedon thickness - 7 to 9 inches.
Depth to calcic horizon - 15 to 30 inches.
Depth to seasonal high water table - 24 to 42 inches.
A horizon - Chroma: 1 or 2
Clay content: 20 to 27 percent
Electrical conductivity: 0 to 4 mmhos/cm
Calcium carbonate equivalent: 5 to 25 percent
Reaction: pH 7.9 to 8.4
Btn horizon - Value: 5 or 6 dry; 3 or 4 moist
Chroma: 2 or 3
Texture: silty clay loam, clay loam
Clay content: 27 to 35 percent
Electrical conductivity: 2 to 8 mmhos/cm
Sodium adsorption ratio: 13 to 30
Calcium carbonate equivalent: 5 to 25 percent
Reaction: pH 8.5 to 9.6
Bkn horizon - Value: 6 or 7 dry; 3 to 5 moist
Chroma: 1 to 3
Texture: silty clay loam, clay loam, silt loam , loam
Clay content: 20 to 35 percent
Electrical conductivity: 2 to 8 mmhos/cm
Sodium adsorption ratio: 5 to 25
Calcium carbonate equivalent: 15 to 30 percent
Reaction: pH 8.5 to 9.6
Bkg horizon - Value: 6 or 7 dry; 3 to 5 moist
Chroma: 1 or 2
Texture: silty clay loam, clay loam, loam, silt loam, loam, sandy loam
Clay content: 18 to 35 percent
Electrical conductivity: 0 to 4 mmhos/cm
Calcium carbonate equivalent: 10 to 30 percent
Reaction: pH 8.5 to 9.0
COMPETING SERIES:
Sorum (SD) - does not have a calcic horizon; has an E horizon; is well drained.
GEOGRAPHIC SETTING:
Landform - stream terraces.
Elevation - 4,100 to 4,400 feet.
Slope - 0 to 2 percent.
Parent material - alluvium.
Climate - long, cold winters; moist springs; warm summers.
Mean annual precipitation - 10 to 14 inches.
Mean annual air temperature - 41 to 45 degrees F.
Frost-free period - 95 to 115 days.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; moderately slow permeability.
USE AND VEGETATION: Reycreek soils are used mainly for rangeland and wildlife habitat. Potential native vegetation is mainly alkali sacaton, inland saltgrass, western wheatgrass, sedges and rushes.
DISTRIBUTION AND EXTENT: Reycreek soils are of small extent in southwestern Montana.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Gallatin County, Montana, 1997.
REMARKS: Soil interpretation record: MT1457. Diagnostic horizons and features recognized in this pedon are: a mollic epipedon from the soil surface to 7 inches (A horizon); a natric horizon from 6 to 20 inches (Btn horizon); a calcic horizon from 20 to 36 inches (Bkn horizon); a particle size control section from 6 to 20 inches (Btn horizon). Reycreek soils have a frigid temperature regime and an ustic moisture regime bordering on aridic.