LOCATION STOCKEL OR
Established Series
Rev. DMH/GLG
01/2023
STOCKEL SERIES
The Stockel series consists of very deep, somewhat poorly drained soils that formed in mixed alluvium and colluvium. Stockel soils are on footslopes and in swales and narrow drainageways dissecting old alluvial terraces and have slopes of 3 to 12 percent. The mean annual temperature is about 53 degrees F., and mean annual precipitation is about 40 inches.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Aquultic Haploxeralfs
TYPICAL PEDON: Stockel fine sandy loam on a 3 percent west-facing slope in an improved pasture. (Colors are for moist soil unless otherwise noted.)
A1--0 to 4 inches; dark brown (10YR 3/3) fine sandy loam, pale brown (10YR 6/3) dry; many fine and medium prominent strong brown (7.5YR 5/8) mottles; moderate very fine and fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine and common medium roots; few very fine interstitial pores; moderately acid (pH 5.8); clear smooth boundary. (2 to 5 inches thick)
A2--4 to 9 inches; dark brown (10YR 3/3) fine sandy loam, pale brown (10YR 6/3) dry; moderate very fine and fine granular and subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; common very fine and fine continuous tubular pores; many fine and medium prominent strong brown (7.5YR 5/8) masses of iron accumulation; moderately acid (pH 5.8); clear smooth boundary. (3 to 7 inches thick)
Bt1--9 to 15 inches; dark brown (10YR 3/3) loam, pale brown (10YR 6/3) dry; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine and fine continuous tubular pores; few faint brown (7.5YR 4/4) clay films on peds and in pores; many fine and medium distinct grayish brown (10YR 5/2) and yellowish brown (10YR 5/8) masses of iron accumulation; moderately acid (pH 5.8); clear smooth boundary. (4 to 8 inches thick)
Bt2--15 to 23 inches; dark yellowish brown (10YR 4/4) heavy loam, light yellowish brown (10YR 6/4) dry; common medium prominent very dark gray (10YR 3/1) manganese stains; moderate fine and medium subangular blocky structure; hard, firm, slightly sticky and slightly plastic; common very fine roots; many very fine, fine, and medium continuous tubular pores; few distinct brown (7.5YR 4/4) clay films on peds and in pores; many fine and medium distinct grayish brown (10YR 5/2) iron depletions and brownish yellow (10YR 6/8) masses of iron accumulation; strongly acid (pH 5.3); gradual smooth boundary. (6 to 10 inches thick)
Bt3--23 to 31 inches; dark yellowish brown (10YR 4/4) gravelly loam, light yellowish brown (10YR 6/4) dry; moderate medium and coarse subangular blocky structure; soft, friable, slightly sticky and slightly plastic; few very fine roots; many very fine, fine and medium continuous tubular pores; few faint brown (7.5YR 4/4) clay films on peds in pores and bridging some sand grains; many fine and medium distinct light brownish gray (10YR 6/2) iron depletions and strong brown (7.5YR 4/6) masses of iron accumulaiton; many fine and medium very dark gray (10YR 3/1) manganese stains; 20 percent fine sandstone fragments; strongly acid (pH 5.3); clear smooth boundary. (6 to 10 inches thick)
BCt--31 to 43 inches; dark yellowish brown (10YR 4/4) gravelly sandy loam, light yellowish brown (10YR 6/4) dry; weak medium and coarse subangular blocky structure; soft, friable, slightly sticky and nonplastic; few very fine roots; many very fine, fine and medium continuous tubular pores; few faint brown (7.5YR 4/4) clay films in pores and bridging some sand grains; 25 percent fine sandstone fragments; many fine and medium distinct light brownish gray (10YR 6/2) iron depletions and strong brown (7.5YR 4/6) masses of iron accumulation; many fine and medium very dark gray (10YR 3/1) manganese stains; strongly acid (pH 5.3); abrupt smooth boundary. (8 to 12 inches thick)
2Bt--43 to 63 inches; mottled grayish brown (10YR 5/2) and yellowish brown (10YR 5/8) clay; appears massive when wet but weak very coarse prismatic structure parting to coarse and very coarse subangular blocky; very hard, very firm, very sticky and very plastic; few very fine roots; few discontinuous tubular pores; common distinct clay films on peds; strongly acid (pH 5.3).
TYPE LOCATION: Douglas County, Oregon; about 2 miles south of the community of Melrose; 1,050 feet west and 300 feet south of the northeast corner of section 13, T. 27 S., R. 7 W.
RANGE IN CHARACTERISTICS: The soil is usually moist, but is dry throughout the control section for 60 to 90 consecutive days during the summer. The mean annual soil temperature ranges from 52 to 57 degrees F. Depth to a nonconforming clay horizon is 40 to 60 inches. This horizon is absent in some pedons.
The A horizon has a hue of 10YR or 7.5YR, value of 2 or 3 moist, 5 or 6 dry and chroma of 2 or 3 moist and dry. It has 0 to 10 percent gravel.
The Bt horizon has hue of 10YR or 7.5YR, value of 3 or 4 moist, 6 or 7 dry and chroma of 3 or 4 moist and dry. It is loam, gravelly loam or gravelly sandy loam and has 18 to 27 percent clay. Coarse fragments range from 0 to 25 percent gravel. Clay films are faint to distinct.
The 2Bt horizon has hue of 10YR or 7.5YR, value of 5 or 6 moist or dry and chromas of 2 or 3 moist and 7 or 8 dry. Coarse fragments range from 0 to 15 percent gravel. It is 50 to 65 percent clay.
COMPETING SERIES: This is the
Quatama series. Quatama soils are moderately well drained and lack redoximorphic features in the upper 15 inches of the profile, lack the gravelly sandy loam horizon in the lower part of the control secction and the clay horizon below 40 inches.
GEOGRAPHIC SETTING: Stockel soils are in dissected drainageways on footslopes and in swale positions. Elevations are 400 to 1,500 feet. Slopes are 3 to 12 percent. The soils formed in mixed alluvium and colluvium derived predominantly from sandstone and siltstone. The climate is characterized by cool wet winters and dry warm summers. The mean annual temperature is 50 to 55 degrees F., and the mean annual precipitation is 30 to 60 inches. The frost-free season is 160 to 235 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Nonpareil,
Bateman,
Speaker,
Sutherlin and
Waldo soils. Nonpareil soils are 10 to 20 inches to a paralithic contact. Bateman soils average more than 35 percent clay in the particle-size control section and are well drained. Speaker soils are 20 to 40 inches to a paralithic contact and are well drained. Sutherlin is moderately well drained and the upper solum is silty clay loam or clay loam with 27 to 35 percent clay and have contrasting textures within 40 inches. Waldo soils have a mollic epipedon and are poorly drained.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow runoff; moderate permeability in the upper 43 inches and very slow below.
USE AND VEGETATION: Stockel soils are used for pasture and forage crops and wildlife habitat. Native vegetation is Oregon white oak, Oregon ash, Pacific madrone, poison oak, sweetbriar rose, sedges, and blue wildrye.
DISTRIBUTION AND EXTENT: Interior valleys of southern and west-central Oregon. MLRA 5. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Douglas County, Oregon, 1994.
REMARKS: The superactive cation exchange activity class was added to the classification in 10/2005. The competing series section was not updated at that time. Last revision 3/1995.
National Cooperative Soil Survey
U.S.A.