LOCATION HULLT OR

Established Series
Rev. AON/WRP
06/2011

HULLT SERIES

The Hullt series consists of deep, well drained soils that formed in colluvium weathered from sandstone and tuff. Hullt soils are on uplands and have slopes of 2 to 60 percent. The mean annual precipitation is about 60 inches. The mean annual temperature is about 50 degrees.

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Humixerepts

TYPICAL PEDON: Hullt clay loam, cultivated. (Colors for moist soil unless otherwise noted.)

Ap--0 to 9 inches; very dark brown (7.5YR 2/2) clay loam, brown (7.5YR 4/4) dry; weak very fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; many roots; many very fine pores; few very fine black and reddish colored concretions; moderately acid (pH 5.8); abrupt wavy boundary. (8 to 10 inches thick)

AB--9 to 15 inches; dark brown (7.5YR 3/2) clay loam, brown (7.5YR 4/4) dry; weak fine and very fine subangular blocky structure; hard, friable, moderately sticky and moderately plastic; many roots; many fine and very fine tubular pores; common worm casts; strongly acid (pH 5.4); clear smooth boundary. (0 to 8 inches thick)

BA--15 to 22 inches; dark reddish brown (5YR 3/4) silty clay loam, reddish brown (5YR 4/4) dry; weak coarse and medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common roots; many very fine tubular pores; few fine and very fine tubular pores; strongly acid (pH 5.4); clear smooth boundary. (0 to 9 inches thick)

Bw1--22 to 33 inches; reddish brown (5YR 4/4) silty clay loam, reddish brown (5YR 5/4) dry; weak medium subangular blocky structure; hard, friable, moderately sticky and moderately plastic; common roots; common fine and very fine pores; very strongly acid (pH 5.0); clear smooth boundary. (9 to 13 inches thick)

Bw2--33 to 46 inches; yellowish red (5YR 4/6) silty clay loam, yellowish red (5YR 5/6) dry; weak medium and fine subangular blocky structure; very hard, firm, moderately sticky and moderately plastic; few roots; common fine and very fine tubular pores; very strongly acid (pH 5.0); gradual smooth boundary. (10 to 16 inches thick)

BC--46 to 55 inches; brown (7.5YR 4/4) silty clay loam, strong brown (7.5YR 5/6) dry; common faint medium and coarse reddish brown (5YR 4/4) mottles; weak coarse subangular blocky structure; hard, firm, moderately sticky and very plastic; few roots; common fine and very fine tubular pores; few black medium stains; very strongly acid (pH 5.0) clear wavy boundary. (0 to 20 inches thick)

Crt--55 inches; variegated strong brown (7.5YR 5/6 and 5/8) pinkish gray (7.5YR 6/2) and yellowish red (5YR 4/6) weathered sandstone; clay films along fractures.

TYPE LOCATION: Marion County, Oregon; SW1/4 NE1/4 section 26, T.6S., R.1E.

RANGE IN CHARACTERISTICS: The soils are usually moist but are dry continuously for 45 to 70 days during the summer between depths of 4 and 12 inches. The mean annual soil temperature ranges from 50 to 52 degrees F. Depth to weathered bedrock is 40 to 60 inches or more. Rock fragments commonly are absent in the upper 40 inches of the soil but in some pedons they range to 15 percent and up to 35 percent below a depth of 40 inches. The soils are moderately acid or strongly acid in the upper part and strongly acid or very strongly acid in the lower part. The umbric epipedon is 10 to 18 inches thick.

The A horizon has hue of 7.5YR or 5YR, value of 2 or 3 moist, 4 or 5 dry, and chroma of 2 or 3 moist and 3 or 4 dry. It has weak or moderate granular or fine or very fine subangular blocky structure.

The Bw horizon has value of 3 or 4 moist, 5 or 6 dry, and chroma of 4 through 6 moist and dry. It is loam, clay loam or silty clay loam and has 25 to 35 percent clay and more than 15 percent coarser than very fine sand. It has weak fine or medium subangular blocky structure.

COMPETING SERIES: These are the Baumgard, Buckhorn and Culbertson series. Baumgard soils have 15 to 35 percent hard rock fragments in the particle size control section. Buckhorn soils have hue yellower than 5YR in the control section. Culbertson soils are slightly acid and formed in materials high in ash.

GEOGRAPHIC SETTING: Hullt soils are on uplands at elevations of 600 to 1,400 feet. Gradients range from 2 to 60 percent. The soils formed in deep moderately fine textured colluvium weathered from sandstone and tuffs. The climate is humid temperate, having a mean annual temperature 48 to 52 degrees F.; the mean January temperature of 36 degrees F.; the mean July temperature of 63 degrees F.; The mean annual precipitation is 50 to 65 inches. The frost free season is 165 to 210 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bellpine, Nekia, and Willakenzie soils and the McCully soils at the higher elevations. Bellpine, Nekia, and Willakenzie soils have an argillic horizon and are 20 to 40 inches deep to bedrock. McCully soils are fine textured and have a udic moisture regime.

DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; moderate permeability.

USE AND VEGETATION: These soils are used primarily for forestry but some areas are used for small grains, pasture, hay, and grass seed production. The natural vegetation is Douglas-fir, vine maple, alder, ferns, blackberry, hazel, salal, and swordfern.

DISTRIBUTION AND EXTENT: Low footslopes of western Cascade mountains in Oregon; MLRA 2. They are of small extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Marion County, Oregon, 1973.

REMARKS: Diagnostic horizons and features recognized in this pedon include:
Umbric epipedon - from 0 to 15 inches Ap and AB horizons)
Cambic horizon - from 15 to 55 inches

National Cooperative Soil Survey
U.S.A.