LOCATION HUM WAEstablished Series
TAXONOMIC CLASS: Ashy over loamy, glassy over mixed, superactive, frigid Alfic Humic Vitrixerands
TYPICAL PEDON: Hum ashy loam, abandoned cropland. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 7 inches; dark grayish brown (10YR 4/2) ashy loam, very dark brown (10YR 2/2) moist; weak fine and very fine granular structure; soft, very friable, slightly sticky and slightly plastic; many roots; 5 percent gravel; neutral (pH 6.6); clear smooth boundary. (6 to 7 inches thick)
A--7 to 11 inches; dark grayish brown (10YR 4/2) ashy loam, very dark brown (10YR 2/2) moist; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; many roots; many very fine and fine pores; 5 percent gravel; neutral (pH 6.6); clear wavy boundary. (3 to 11 inches thick)
Bw--11 to 17 inches; light yellowish brown (10YR 6/4) ashy loam, dark yellowish brown (10YR 3/4) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many roots; common fine and very fine pores; 5 percent gravel; neutral (pH 6.8); abrupt wavy boundary. (0 to 12 inches thick)
2Bt1--17 to 35 inches; pale brown (10YR 6/3) gravelly clay loam, brown (10YR 4/3) moist; massive; slightly hard, friable, slightly sticky and moderately plastic; very few very fine roots; common very fine pores; few faint brown (7.5YR 4/2) clay films in small pores and prominent to distinct clay films in medium and large pores and cavities; 15 percent gravel; neutral (pH 6.8); gradual wavy boundary. (13 to 22 inches thick)
2Bt2--35 to 46 inches; light yellowish brown (2.5Y 6/4) gravelly clay loam, olive brown (2.5Y 4/4) moist; massive; slightly hard, friable, moderately sticky and moderately plastic; very few very fine roots; few very fine pores; few faint brown (7.5YR 4/2) clay films in small pores and prominent to distinct films in medium and large pores and cavities; 20 percent gravel; neutral (pH 7.0); clear wavy boundary. (6 to 14 inches thick)
2Bk--46 to 54 inches; light gray (2.5Y 7/2) gravelly loam, grayish brown (2.5Y 5/2) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; very few very fine roots; few very fine pores; calcium carbonate coating pores; 20 percent gravel; moderately alkaline and calcareous (pH 8.4).
TYPE LOCATION: Ferry County, Washington; 1,650 feet west and 1,056 feet north of the southeast corner of sec. 10, T.39N., R.34E. (Latitude 48 degrees, 53 minutes, 17 seconds North, Longitude 188 degrees, 29 minutes, 27 seconds West).
RANGE IN CHARACTERISTICS:
Soil moisture: These soils are usually moist, but are dry for 75 to 90 consecutive days following the summer solstice; xeric soil moisture regime.
Soil temperature: mean annual soil temperature is 42 to 47 degrees F.
Rock fragments: 5 to 35 percent throughout the particle-size control section.
Andic soil properties: 14 to 30 inches thick with moist bulk density 0,65 to 0.85 g/cc, volcanic glass content of 30 to 60 percent, acid-oxalate extractable aluminum plus one-half the acid-oxalate extractable iron of 1.0 to 2.0 percent and 15-bar water retention of 5 to 12 percent for air-dried samples.
Depth to secondary carbonates: 36 to 50 inches.
Mollic epipedon thickness: 10 to 20 inches
A horizon
Chroma: 1 or 2, dry or moist
Texture: ashy loam or stony ashy loam
Bw horizon (when present)
Value: 5 or 6 dry, 3 or 4 moist
Chroma: 3 or 4, dry or moist
Texture: ashy silt loam or ashy loam
2Bt horizon
Hue: 10YR or 2.5Y hue
Value: 5 or 6 dry, and 3 or 4 moist
Chroma: 3 or 4, dry or moist
Texture: gravelly clay loam, clay loam, loam, or gravelly loam with 25 to 35 percent clay
Structure: massive or weak subangular blocky
Clay films: faint discontinuous to prominent nearly continuous in pores and in root channels.
2Bk horizon
Texture: gravelly loam, gravelly clay loam or gravelly silty clay loam
Reaction: slightly alkaline to moderately alkaline
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Hum soils are on hillslopes. Slopes range from 0 to 45 percent. These soils formed in volcanic ash over glacial till of mixed mineralogy including granite, argillite, limestone, and serpentine rocks. Elevations are 1,900 to 4,300 feet. The climate is characterized by warm, dry summers and cool, moist winters. The mean annual air temperature is 42 to 44 degrees F., The mean annual precipitation is 15 to 20 inches, The frost-free season is 100 to 130 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Koepke, Molson, and Republic soils. Koepke and Molson soils do not have an argillic horizon below the ash mantle. Republic soils do not have an ash mantle.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderately slow permeability.
USE AND VEGETATION: Alfalfa hay, small grains, and range. The native vegetation consists of bluebunch wheatgrass, rough fescue, Idaho fescue, Sandberg bluegrass, and scattered ponderosa pine.
DISTRIBUTION AND EXTENT: Okanogan, and Ferry Counties, Washington; MLRA 43A. These soils are of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Ferry County (North Ferry Area), Washington, 1971.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: the zone from the mineral soil surface to 11 inches (Ap and A horizons)
Cambic horizon: the zone from 11 to 17 inches (Bw horizon)
Argillic horizon: the zone from 17 to 46 inches (2Bt horizon)
Strongly contrasting particle-size class change at 17 inches.
Andic soil properties are estimated based on the ranges from the associated Molson and Koepke series
The soil was originally classified as; ashy over loamy, mixed, frigid Mollic Vitrandepts.