LOCATION HUBERLY OREstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Typic Fragiaquepts
TYPICAL PEDON: Huberly silt loam, native brush, pasture. (Colors are for moist soil unless otherwise noted.)
A--0 to 8 inches; very dark gray (10YR 3/1) silt loam, gray (10YR 6/1) dry; few faint dark gray (10YR 4/1) mottles; strong fine subangular blocky structure; slightly hard, friable, nonsticky and slightly plastic; many very fine pores; many roots; moderately acid (pH 6.0); abrupt smooth boundary. (7 to 9 inches thick)
BA--8 to 15 inches; grayish brown (10YR 5/2) silt loam, light gray (10YR 7/2) dry; many fine faint and prominent mottles of dark gray (10YR 4/1) and reddish brown (5YR 4/4) moderate medium and fine subangular blocky structure; slightly hard, friable, nonsticky and slightly plastic; many medium to very fine pores; common fine roots; moderately acid (pH 5.8); clear smooth boundary. (5 to 10 inches thick)
Bt--15 to 25 inches; grayish brown (10YR 5/2) heavy silt loam, light gray (10YR 7/2) dry; many fine distinct mottles of dark brown (7.5YR 4/2) and yellowish red (5YR 4/6) moderate coarse and medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; many very fine and fine pores; common roots; faint continuous clay films in some channels; moderately acid (pH 5.7); clear smooth boundary. (6 to 15 inches thick)
2Btx1--25 to 38 inches; dark grayish brown (10YR 4/2) silt loam; common fine distinct brown (7.5YR 4/4) mottles and thick grayish brown (10YR 5/2) silt and sand coatings on faces of peds; weak coarse subangular blocky structure; hard, firm, brittle, nonsticky and slightly plastic; many fine and very fine pores; few roots along structural fractures; few faint clay films in some pores and channels; few fine black splotches; moderately acid (pH 5.6); clear smooth boundary. (4 to 15 inches thick)
2Btx2--38 to 42 inches; mottled gray (10YR 5/1), brown (10YR 5/3), dark grayish brown (10YR 4/2), and dark brown (10YR 4/3) silt loam; massive with bleached fractured planes that form polygons; hard, firm, brittle, slightly sticky and plastic; many medium and fine pores; few very fine roots along fractures; faint clay films in some channels; few black splotches; moderately acid (pH 5.6).
TYPE LOCATION: Washington County, Oregon; end of Swank Road, 25 feet north of road; NW1/4 SW1/4 section 15, T.2S., R.2W., W.M.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 54 to 56 degrees F. The soils are saturated with water during the winter season unless artifically drained. Depth to the fragipan ranges from 20 to 30 inches. Soil depth is over 60 inches, but rooting depth may be limited by a seasonal watertable that forms above the fragipan.
The A horizon has value of 3 or 4 moist, and chroma of 1 or 2 moist and dry. Faint redox concentrations with chroma of 4 or less are throughout the A horizon or only in the lower part.
The Bt horizon has hue of 10YR through 5Y, value of 3 through 5 moist, and chroma of 2 through 4. Distinct and prominent redox concentrations have value of 4 or 5 moist and moist chroma of 2 or less in hue of 10YR and 4 through 6 in hue of 5YR. This horizon is silt loam to silty clay loam and averages 27 to 35 percent clay. Structure ranges from moderate coarse to fine subangular blocky.
The 2Btx horizon (fragipan) ranges from having weak coarse subangular blocky or prismatic structure to being structureless with fracture planes forming polygons. Brittleness ranges from weak to moderate and moist consistence from firm to very firm.
COMPETING SERIES: Huberly is the only series in this family. Similar soils include the Delena series. Delena soil have umbric epipedon.
GEOGRAPHIC SETTING: The Huberly soils are on level to gently sloping concave swales that dissect old alluvial terraces and terminate on the bottomland at elevations of 150 to 250 feet. Slopes range from 0 to 3 percent. The soils formed in silty alluvium of mixed origin. The climate is cool and subhumid average July temperature is 66 degrees F.; average January temperature is 37 degrees F.; and the average annual temperature is 52 degrees to 54 degrees F. The frost-free season is 165 to 210 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Aloha, Quatama, and Woodburn soils on the terraces, and the Verboort soils on the bottomlands. Aloha soils lack fragipans and are somewhat poorly drained. Quatama soils lack a fragipan and are moderately well drained. Woodburn soils lack a fragipan, and are moderately well drained. Verboort soils are fine textured and lack a fragipan.
DRAINAGE AND PERMEABILITY: Poorly drained; slow to ponded runoff; slow permeability.
USE AND VEGETATION: Pasture, grass and legume seed, small grains. Native vegetation is mainly ash, willow, hazelbrush, sedges, with some Douglas-fir and western redcedar, grasses, and weeds.
DISTRIBUTION AND EXTENT: Tualatin Valley and northern Willamette Valley, Oregon. The soil is inextensive.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Washington County, Oregon, 1975.
REMARKS: Diagnostic horizons and other features:
Ochric epipedon - 0 to 8 inches
Cambic horizon - 8 to 38 inches
Fragipan - 38 to 42 inches