LOCATION PAVOHROO ID+WY
Established Series
Rev. RAS/RG/CLM
06/2011
PAVOHROO SERIES
The Pavohroo series consists of deep and very deep well drained soils that formed in silty alluvium and colluvium derived from loess and a variety of sedimentary and metasedimentary rocks. They are on mountains. Slopes are 0 to 70 percent. The mean annual precipitation is about 26 inches and the mean annual temperature is about 39 degrees F.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Pachic Haplocryolls
TYPICAL PEDON: Pavohroo loam - on a 35 percent north slope in woodland at 7,000 feet elevation. (Colors are for dry soil unless otherwise noted.)
Oi--0 to 1 inch; black (10YR 2/1) decomposed needles and leaves, abrupt wavy boundary. (0 to 2 inches thick)
A1--1 to 4 inches; very dark gray (10YR 3/1) loam, black (10YR 2/1) moist; moderate fine granular structure; soft, friable, slightly sticky, slightly plastic; many fine and medium roots; many very fine and fine irregular pores; slightly acid (pH 6.4); clear smooth boundary. (2 to 11 inches thick)
A2--4 to 10 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; weak medium subangular blocky structure parting to moderate medium granular; slightly hard, friable, slightly sticky, slightly plastic; common fine and medium roots; many very fine and fine tubular pores; slightly acid (pH 6.4); gradual smooth boundary. (4 to 8 inches thick)
A3--10 to 18 inches; dark grayish brown (10YR 4/2) loam, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure parting to moderate coarse granular; slightly hard, friable, slightly sticky, slightly plastic; common fine and medium roots; many very fine and fine pores; 5 percent angular limestone gravel, slightly acid (pH 6.4); gradual smooth boundary. (6 to 10 inches thick)
AB--18 to 27 inches; dark grayish brown (10YR 4/2) light clay loam, very dark grayish brown (10YR 3/2) moist; moderate medium and fine subangular blocky structure; hard, firm, slightly sticky, slightly plastic; common fine and medium roots; many very fine and fine tubular pores; 10 percent angular limestone gravel; slightly acid (pH 6.4); clear wavy boundary. (7 to 12 inches thick)
Bw1--27 to 37 inches; grayish brown (10YR 5/2) gravelly clay loam, dark grayish brown (10YR 4/2) moist; moderate medium subangular blocky structure; hard, firm, slightly sticky, slightly plastic; common fine and medium roots; many very fine and fine tubular pores; about 20 percent limestone gravel; noncalcareous except limestone fragments; slightly acid (pH 6.5); gradual wavy boundary. (8 to 14 inches thick)
Bw2--37 to 45 inches; brown (10YR 5/3) gravelly clay loam, dark grayish brown (10YR 4/2) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; few fine and medium roots; many very fine and fine tubular pores; about 30 percent limestone gravel; noncalcareous except limestone fragments; slightly acid (pH 6.5); gradual wavy boundary. (4 to 12 inches thick)
C--45 to 57 inches; brown (10YR 5/3) gravelly loam, dark grayish brown (10YR 4/2) moist; massive; slightly hard, friable, slightly sticky, slightly plastic; few fine and medium roots; many very fine and fine tubular pores; about 35 percent limestone gravel; slightly effervescent; slightly alkaline (pH 7.6); abrupt wavy boundary. (0 to few feet thick)
R--57 inches; fractured limestone bedrock.
TYPE LOCATION: Bingham County, Idaho; about 6 miles east of Alridge on a branch of Miner Creek; 1,300 feet south of the northeast corner of section. 28, T. 2 S., R. 39 E.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 38 to 44 degrees F.
Thickness of mollic epipedon - 16 to 45 inches
Thickness of the solum - 30 to more than 60 inches
Depth to bedrock - 40 to more than 60 inches
Depth to carbonates - 40 to more than 60 inches
Soil moisture regime - udic
Particle size control section
Clay content - 18 to 30 percent
Rock fragments - commonly increase with depth but average less than 35 percent
A horizon
Value - 3 through 5 dry, 1 through 3 moist
Chroma, dry or moist - 1 through 3
Reaction - slightly acid or neutral
Texture L, SIL, GR-L
Bw horizon
Hue - 10YR or 2.5Y
Value - 3 through 6 dry, 3 or 4 moist
Chroma, dry or moist - 2 through 4
Reaction - slightly acid or neutral
Texture - SIL, L, GR-L, ST-L, CL, GR-CL, GR-SIL
C horizon (if present)
Value - 5 or 6 dry
Chroma - 2 through 4 dry or moist
Effervescence - none to violent
Reaction - neutral through moderately alkaline
Texture - GR-L, L, ST-L, GR-CL
COMPETING SERIES: These are the
Adel,
Argee (T),
Bullbasin (T),
Duff,
Hackwood,
Lamphier,
Leavittville,
Lespate,
Ohbejoyful,
Rhone,
Secondset,
Strickland,
Taterheap, and
Winevada series. Adel soils lack a cambic horizon. Argee soils are moderately deep to paralithic contact. Bullbasin soils have mean annual soil temperatures less than 38 degrees F. Duff soils lack O and Bw horizons. Hackwood soils are moderately well drained and lack Bw horizons. Leavittville, soils are calcareous within a depth of 40 inches. Lamphier soils lack cambic horizons. Ohbejoyful soils mean annual precipitation is greater than 30 inches. Rhone soils have a larger component of sand in the control section and have sandy clay loam textures. Lespate, Secondset, Strickland, and Winevada soils have bedrock within 40 inches. Taterheap soils have a lithologic discontinuity.
GEOGRAPHIC SETTING: Pavohroo soils are on mountains. Slopes are 0 to 70 percent. They formed in silty alluvium and colluvium derived from loess and a variety of sedimentary and metasedimentary rocks. The mean annual precipitation is 20 to 28 inches and the mean annual temperature is 36 to 42 degrees F. Frost-free season is less than 65 days. Elevation is 5,000 to 8,000 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Camelback,
Greys,
Ireland,
Moonlight,
Ricrest,
Sedgway, and
Sheege series. Camelback soils are loamy-skeletal, have argillic horizons, and are frigid. Greys soils are fine-silty, and have albic and argillic horizons. Ireland soils are loamy-skeletal and are moderately deep to bedrock. Moonlight soils are coarse-loamy. Ricrest soils are frigid and have calcic horizons. Sedgway soils are loamy-skeletal and have argillic horizons. Sheege soils are loamy-skeletal and lithic. Camelback, Ireland, and Ricrest are on south-facing mountain slopes. Greys soils are on footslopes below the Pavohroo soil. Moonlight soils are on the same landscape positions as Pavohroo but on drier sites.
Sedgwick soils are on convex north and east-facing mountain slopes. Sheege soils are on ridgetops.
DRAINAGE AND PERMEABILITY: Well drained; runoff is slow to very rapid; permeability is moderate or moderately slow.
USE AND VEGETATION: This Pavohroo soil is used mainly for grazing and timber production. The potential natural vegetation is mainly Douglas-fir, pine reedgrass, and mountain snowberry.
DISTRIBUTION AND EXTENT: Southeastern, Idaho. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Bingham County, Idaho, 1972.
REMARKS: Diagnostic horizons and other features recognized in this pedon are:
Depth to all diagnostic horizons features are measured from the top of the first mineral horizon.
Mollic epipedon (pachic) - the zone from 1 to to 27 inches (A1, A2, A3, and AB horizons)
Cambic horizon - the zone from 27 to 45 inches (Bw1 and Bw2 horizons)
Lithic contact - the contact with limestone at 57 inches (R layer)
In 2010/2011 the soil moisture regime based on vegetative indicators was considered to be udic. Prior to this date no moisture regime was correlated to the series. All soil surveys in which this series is used need review for udic or xeric soil moisture regime.
National Cooperative Soil Survey
U.S.A.