LOCATION SETTERS IDEstablished Series
TAXONOMIC CLASS: Fine, smectitic, frigid Ultic Palexerolls
TYPICAL PEDON: Setters silt loam, cultivated, on a 10 percent south-facing slope at 2,600 feet elevation. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 7 inches; brown (10YR 5/3) silt loam, dark brown (10YR 3/3) moist; weak very fine and fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine and fine roots; many very fine and fine pores; slightly acid (pH 6.1); abrupt smooth boundary. (0 to 8 inches thick)
A--7 to 11 inches; brown (10YR 5/3) silt loam, dark brown (10YR 3/3) moist; moderate very fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; few very fine and fine pores; few very fine manganese oxide concretions; moderately acid (pH 5.8); abrupt smooth boundary. (3 to 7 inches thick)
Btc--11 to 16 inches; brown (10YR 5/3) silt loam, dark brown (10YR 3/3) moist; weak medium prismatic structure parting to moderate medium subangular blocky; hard, friable, slightly sticky and slightly plastic; few fine roots; many very fine, fine, and few medium pores; few faint clay films lining pores and on vertical and horizontal faces of peds; few faint uncoated silt grains on faces of peds; many very fine manganese oxide concretions; moderately acid (pH 5.6); abrupt smooth boundary. (4 to 15 inches thick)
Ec--16 to 17 inches; very pale brown (10YR 7/3) silt loam, brown (10YR 4/3) moist; weak medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; few fine roots; many very fine pores; many very fine manganese oxide concretions; moderately acid (pH 5.7); abrupt smooth boundary. (1 to 16 inches thick)
Btcb1--17 to 22 inches; yellowish brown (10YR 5/4) silty clay, dark yellowish brown (10YR 3/4) moist; moderate medium prismatic structure parting to moderate very fine angular blocky; extremely hard, extremely firm, moderately sticky and moderately plastic; few fine roots; common very fine pores; continuous prominent dark brown (7.5YR 3/2) clay films on vertical and horizontal faces of peds; upper part of prisms have faint coatings of E material on faces of peds; many fine manganese oxide concretions; slightly acid (pH 6.2); gradual wavy boundary. (5 to 13 inches thick)
Btcb2--22 to 27 inches; pale brown (10YR 6/3) silty clay, yellowish brown (10YR 5/4) moist; moderate coarse and medium angular blocky structure; extremely hard, extremely firm, very sticky and very plastic; many very fine pores; common prominent brown (7.5YR 5/4) clay films on vertical and horizontal faces of peds; many fine manganese oxide concretions; neutral (pH 6.6); gradual wavy boundary. (4 to 20 inches thick)
Btcb3--27 to 60 inches; pale brown (10YR 6/3) silty clay, yellowish brown (10YR 5/4) moist; moderate coarse and medium angular blocky structure; extremely hard, extremely firm, very sticky and very plastic; many very fine and few medium pores; continuous prominent dark brown (7.5YR 3/2) clay films; many fine manganese oxide concretions; neutral (pH 7.1)
TYPE LOCATION: Kootenai County, Idaho; approximately 4 miles northwest of Worley, about 1500 feet south and 1600 feet east of the northwest corner of section 5, T. 47 N., R. 5 W. Boise Meridian; (Latitude - 47 degrees, 26 minutes, 55 seconds North and Longitude - 116 degrees, 59 minutes, 40 seconds West; USGS Worley Quadrangle).
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 41 to 47 degrees F.
Average summer soil temperature - 59 to 61 degrees F.; without an O horizon Depth to bedrock - greater than 60 inches
Mollic epipedon thickness - 11 to 18 inches
Base saturation - 50 to 75 percent in the upper 20 inches of the argillic horizon
A or Ap horizons
Value - 3 to 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry, 1 to 3 moist
Clay content - 14 to 26 percent
Rock fragments - 0 to 10 percent gravel
Reaction - strongly acid to neutral
Bt horizons
Value - 4 to 6 dry, 2 to 4 moist
Chroma - 2 to 4 dry or moist
Clay content - 14 to 26 percent
Rock fragments - 0 to 5 percent gravel
Reaction - moderately acid to neutral
BE, EB or Bw horizons - present in some pedons
Hue- 10YR dry or moist
Value - 5 or 6 dry, 4 or 5 moist
Chroma - 3 or 4 dry and moist
Texture - SIL, SICL
Clay content - 18 to 28 percent
Rock fragments - 0 to 5 percent gravel
Reaction - strongly acid to slightly acid
Ec or E horizons
Hue - 7.5YR or 10YR dry or moist
Value - 5 to 7 dry, 4 to 6 moist
Chroma - 3 or 4 dry or moist
Texture - SIL, SI, SICL
Clay content - 12 to 30 percent
Rock fragments - 0 to 5 percent gravel
Reaction - strongly acid to slightly acid
Btcb or Btb horizons
Hue - 10YR to 5YR dry or moist
Value - 4 to 6 dry, 3 to 5 moist
Chroma - 2 to 6 dry, 3 to 6 moist
Texture - SIC, SICL, CB-CL
Clay content - 35 to 50 percent
Rock fragments - 0 to 10 percent gravel, 0 to 25 percent cobbles, 0 to 10 percent stones (less than 35 percent total)
Reaction - strongly acid to neutral
COMPETING SERIES: There are no competing series. The Hankins series is in a similar family. Hankins soils do not have an E horizon, have a mollic epipedon 20 to 30 inches thick, and a linear extensibility of more than 6 cm in the upper 100 cm.
GEOGRAPHIC SETTING: Setters soils are on convex positions of loess covered ridge summits, backslopes, and footslopes of hills on dissected basalt plateaus, mountains and benches. These soils formed in loess or loess over silty sediments. Slopes are 0 to 35 percent. Elevations are 1100 to 4300 feet. The average annual precipitation is 22 to 35 inches. The average annual temperature is 40 to 45 degrees F. The frost-free season is 80 to 125 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are Carlinton, Taney, and Wilkins soils. All these soils are on basalt plateaus. Carlinton soils have a fragipan and lack a mollic epipedon. Taney soils are fine-silty and have a fragipan. Wilkins soils are somewhat poorly drained.
DRAINAGE AND PERMEABILITY: Moderately well-drained; medium to rapid runoff; moderate permeability in the upper part of the profile and very slow in the lower part. A perched water table is at its uppermost limit from December through May. Occasional, brief ponding can occur from November to July.
USE AND VEGETATION: These soils are used mainly for wheat, barley, peas, hay, pasture, and timber production. The natural vegetation is mainly an overstory of Douglas-fir and ponderosa pine and an understory of common snowberry, woods rose, white spirea, pine reed grass, and sticky geranium.
DISTRIBUTION AND EXTENT: Benewah, Clearwater, Kootenai, Latah, Lewis, and Nez Perce Counties, Idaho. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Benewah County, Idaho, 1975.
REMARKS:
Diagnostic horizons and other features recognized in this pedon are:
Mollic epipedon - the zone from 0 to 16 inches (A and B horizons)
Albic Horizon - the zone from 16 to 17 inches (E horizon)
Argillic horizon - the zone from 17 to 60 inches (Btb horizons)
Particle-size control section - the upper 20 inches of the argillic horizon (the zone from 17 to 37 inches)
Linear extensibility (LE) - the zone from 0 to 40 inches is assumed to be less than 6.0 cm based on lab data.
Soil moisture regime - xeric
Soil temperature regime - frigid
This soil would qualify for an oxyaquic subgroup of Palexerolls if such a subgroup was available in Soil Taxonomy.
Additional data: NSSL reference analyses are available for this series: 85ID061055 (86P0243) and 86ID069003 (86P883) from the Lewis-Nez Perce, Idaho soil survey area.