LOCATION PADDY MTEstablished Series
TAXONOMIC CLASS: Loamy, mixed, superactive Lithic Haplocryolls
TYPICAL PEDON: Paddy clay loam, forested (Colors are for dry soil unless otherwise noted).
Oi--0 to 1 inch; undecomposed grass, twigs, needles, bark, and roots. (1 to 2 inches thick)
A--1 to 4 inches; dark reddish gray (5YR 4/2) clay loam, dark reddish brown (5YR 3/2) moist; moderate fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; common very fine pores; 5 percent pebbles; neutral (pH 6.6); abrupt smooth boundary. (3 to 5 inches thick)
Bw1--4 to 10 inches; weak red (2.5YR 4/2) clay loam, dusky red (2.5YR 3/2) moist; moderate fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine and few medium roots; common very fine and fine pores; 10 percent pebbles; slightly acid (pH 6.2); clear smooth boundary. (3 to 6 inches thick)
Bw2--10 to 16 inches; reddish brown (2.5YR 4/4) clay loam, dark reddish brown (2.5YR 3/4) moist; weak fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium roots; common fine pores; 10 percent pebbles and 5 percent cobbles; moderately acid (pH 6.0); clear smooth boundary. (4 to 10 inches thick)
R--16 inches; thinly bedded hard red shale.
TYPE LOCATION: Gallatin County, Montana; 400 feet west and 2000 feet north of the SE corner of sec. 14, T.5N., R.4E.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 36 to 40 degrees F.
Mean summer soil temperatured - 45 to 47 degrees F.
Mollic epipedon thickness - 6 to 10 inches.
Depth to R horizon - 10 to 20 inches.
A horizon - Hue: 5YR or 2.5YR
Chroma: 2 or 3
Clay content: 27 to 32 percent
Rock fragments: 5 to 10 percent pebbles.
Reaction: pH 6.6 to 7.3
Bw1 horizon - Hue: 2.5YR or 5YR
Value: 4 or 5 dry
Chroma: 2 or 3
Texture: clay loam or loam
Clay content: 25 to 35 percent
Rock fragments: 5 to 15 percent--0 to 5 percent cobbles, 5 to 10 percent pebbles
Reaction: pH 6.1 to 6.5
Bw2 horizon - Hue: 2.5YR or 5YR
Value: 4 or 5 dry
Chroma: 3 or 4
Texture: clay loam or loam
Clay content: 25 to 35 percent
Rock fragments: 10 to 20 percent--0 to 5 percent cobbles; 10 to 15 percent pebbles
Reaction: pH 5.6 to 6.0
COMPETING SERIES:
Dickle (OR) - has a xeric moisture regime.
Duncom (WY) - has horizon of secondary carbonate accumulation.
Hanagita (AK) - has mean annual soil temperature of less than 35 degrees F., has less than 18 percent clay in the particle-size control section.
Hazton (WY) - has less than 18 percent clay in the particle-size control section.
Heisspitz (CO) - has mean summer soil temperature of 48 to 55 degrees F., does not have an O horizon.
Jenkinson (WY) - is moderately or strongly alkaline throughout; is calcareous throughout.
Lotex (UT) - has less than 18 percent clay in the particle-size control section.
Skisams (CO) - has mean summer soil temperature of 52 to 58 degrees F., does not have an O horizon.
Spliten (ID) - has less than 18 percent clay in the particle-size control section, has mean summer soil temperature of 56 to 59 degrees F.
Splitro (WY) - has less than 18 percent clay in the particle-size control section.
Trump (CO) - has horizon of secondary carbonate accumulation.
Tuggle (MT) - has a paralithic contact above the lithic contact.
Udelope (NV) - has less than 18 percent clay in the particle-size control section.
GEOGRAPHIC SETTING:
Landform - mountains.
Elevation - 5,800 to 6,500 feet.
Slope - 15 to 45 percent.
Parent material - residuum from hard shale and argillite.
Climate - long, cold winters; cool, moist springs; short summers.
Mean annual precipitation - 20 to 24 inches.
Mean annual temperature - 34 to 38 degrees F.
Frost-free period - 50 to 70 days.
DRAINAGE AND PERMEABILITY: Well drained; moderately slow permeability.
USE AND VEGETATION: Mainly used for timber production and recreation. The potential native vegetation is Douglas fir, Idaho fescue, pinegrass, and lodgepole pine.
DISTRIBUTION AND EXTENT: This soil is 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: MT1425. Diagnostic horizons and features recognized in this pedon include: a mollic epipedon from 1 to 10 inches (A, Bw1 horizons); a cambic horizon from from 10 to 16 inches (Bw2 horizon); a lithic contact at 16 inches (R horizon); a particle size control section from 10 to 16 inches (Bw2 horizon). Paddy soils have a cryic temperature regime and an ustic moisture regime.