LOCATION BAGDAD WAEstablished Series
TAXONOMIC CLASS: Coarse-silty, mixed, superactive, mesic Calcic Argixerolls
TYPICAL PEDON: Bagdad silt loam, cultivated. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 10 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; weak fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many roots; many very fine pores; slightly acid (pH 6.4); abrupt smooth boundary. (8 to 10 inches thick)
A--10 to 14 inches; brown (10YR 5.3) silt loam, very dark grayish brown (10YR 3/2) moist; weak medium granular structure; slightly hard, friable, slightly sticky, and slightly plastic; common roots; many fine pores; thin continuous siliceous coatings on vertical faces of peds; slightly alkaline (pH 7.4); clear wavy boundary. (6 to 8 inches thick)
Bt1--14 to 22 inches; pale brown (10YR 6/3) silt loam, dark brown (10YR 4/3) moist; weak medium prismatic structure; slightly hard, very friable, slightly sticky and slightly plastic; common roots, many very fine pores; few faint clay films on faces of peds; neutral (pH 6.6); clear wavy boundary. (0 to 10 inches thick)
Bt2--22 to 37 inches; pale brown (10YR 6/3) silt loam, dark brown (10YR 4/3) moist; moderate medium prismatic structure; hard, friable, sticky and plastic; common roots; many fine pores; few faint clay films on vertical faces of peds; thin continuous siliceous coatings on peds; slightly alkaline (pH 7.8); clear wavy boundary. (10 to 15 inches thick)
Bk1--37 to 53 inches; yellowish brown (10YR 5/4) silt loam, dark brown (10YR 4/3) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; common roots; many fine pores; strongly effervescent; carbonate material is segregated in pores and root channels; strongly alkaline (pH 8.6); clear wavy boundary. (14 to 17 inches thick)
Bk2--53 to 60 inches; yellowish brown (10YR 5/4) silt loam, dark yellowish brown (10YR 4/4) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; few roots; many fine pores; slightly effervescent; carbonate material occurs in a few pores; moderately alkaline (pH 8.0).
TYPE LOCATION: Lincoln County, Washington; 235 feet west and 1,155 feet south of the NE corner of sec. 21, T. 27 N., R. 34 E.
RANGE IN CHARACTERISTICS: The solum thickness and depth to secondary lime are 30 to 44 inches. The mean annual soil temperature is 47 degrees to 50 degrees F. The soils are usually moist, but are dry in all parts between depths of 4 and 12 inches for 70 to 90 consecutive days following the summer solstice. The control section is 9 to 18 percent clay and 0 to 10 percent particles coarser than fine sand.
Depth to a weakly cemented pan is 40 to more than 60 inches. Some pedons have Btk horizons in place of the Bk horizon.
The A horizon has value of 4 or 5 dry, 2 or 3 moist. It is moderately acid, slightly acid or neutral. It has 6 to 12 percent clay.
The Bt horizon has value of 5 or 6 dry, 3 to 5 moist, and chroma of 2 to 4 dry or moist. It is neutral to moderately alkaline.
The Bk horizon has value of 5 through 7 dry, 4 or 5 moist, and chroma of 3 or 4 dry or moist. It is moderately alkaline or strongly alkaline.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: These soils are at elevations of 2,000 to 3,500 feet on uplands and hills formed from loess. Slopes are 0 to 40 percent. The soils occur in an area with warm dry summers and cool moist winters. The annual precipitation is 12 to 15 inches. The mean January temperature is 27 degrees F., mean July temperature is 71 degrees F., and mean annual temperature is about 47 degrees F. The average frost-free season is 110 to 165 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Anders, Benge, Broadax, Chard, Condon, and Endicott soils. Anders and Condon soils are underlain by basalt at a depth of 20 to 40 inches. Benge soils are underlain by outwash gravel at a depth of 20 to 40 inches. Chard soils are more than 15 percent fine sand or coarser in the control section. Endicott soils are underlain by a lime-silica cemented hardpan at a depth of 24 to 40 inches.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff, depending on slope gradient; moderate permeability; slow permeability through the duripan, if present, at 40 or more inches depth.
USE AND VEGETATION: Used for production of small grains in a dryland winter wheat-summer fallow rotation, grazing, and some hay and pasture. Native vegetation is bluebunch wheatgrass, Idaho fescue, Sandberg bluegrass, threadleaf sedge, three tip sagebrush, Wyoming big sagebrush, and lupine.
DISTRIBUTION AND EXTENT: Eastern Washington. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Lincoln County, Washington, 1978.
REMARKS: Diagnostic horizons and features recognized in this pedon are a mollic epipedon from the surface to 14 inches, an argillic horizon from 14 to 37 inches and a zone of carbonate accumulation from 37 to 60 inches. The particle-size control section is the zone from 14 to 34 inches (Bt1 and Bt2 horizon).
ADDITIONAL DATA: Soil survey laboratory Riverside, California, Characterization Study, Survey No. S61-Wash-22-1-1 through 22-1-7. Partial NSSL lab data is available on another pedon #89P210.