LOCATION WINBLOW WAEstablished Series
TAXONOMIC CLASS: Ashy, glassy, mesic Vitritorrandic Haploxerolls
TYPICAL PEDON: Winblow ashy fine sandy loam - cropland, wheat stubble, on a 5 percent north-northwest facing slope at an elevation of 2,600 feet. (Colors are for dry soil unless otherwise stated. All textures are apparent field textures and spot plate reaction is used for pH values.)
Ap1--0 to 4 inches; brown (10YR 5/3) ashy fine sandy loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure parting to moderate coarse granular; soft, very friable, nonsticky and nonplastic; many very fine and few fine roots; common very fine tubular and common very fine irregular pores; 10 percent sand-size ash, 0.5 to 2.0 mm in diameter; neutral (pH 6.6); abrupt wavy boundary.
Ap2--4 to 7 inches; brown (10YR 5/3) ashy fine sandy loam, very dark grayish brown (10YR 3/2) moist; moderate coarse subangular blocky structure parting to moderate medium subangular blocky; soft, very friable, nonsticky and slightly plastic; many very fine roots; common very fine tubular and common very fine irregular pores; 15 percent sand-size ash, 0.5 to 2.0 mm. in diameter; neutral (pH 6.8); abrupt smooth boundary. (the combined thickness of the Ap horizons is 6 to 10 inches)
A--7 to 16 inches; brown (10YR 5/3) ashy fine sandy loam, very dark grayish brown (10YR 3/2) moist; moderate coarse subangular blocky structure parting to moderate medium subangular blocky; soft, very friable, slightly sticky and slightly plastic; many very fine roots; common very fine tubular and common very fine irregular pores; 15 percent sand-size ash, 0.5 to 2.0 mm. in diameter; neutral (pH 7.0); clear smooth boundary. (4 to 10 inches thick)
Bw1--16 to 22 inches; brown (10YR 5/3) ashy fine sandy loam, very dark grayish brown (10YR 3/2) moist; moderate coarse subangular blocky structure parting to moderate medium subangular blocky; slightly hard, very friable, slightly sticky and slightly plastic; common very fine roots; common very fine tubular and common very fine irregular pores; 20 percent sand-size ash, 0.5 to 2.0 mm. in diameter; neutral (pH 6.8); abrupt smooth boundary.
Bw2--22 to 28 inches; brown (10YR 5/3) ashy fine sandy loam, dark brown (10YR 3/3) moist; moderate coarse subangular blocky structure parting to moderate medium subangular blocky; slightly hard, very friable, slightly sticky and slightly plastic; common very fine roots; common very fine tubular and common very fine irregular pores; 25 percent sand-size ash, 0.5 to 2.0 mm. in diameter; neutral (pH 7.0); abrupt smooth boundary. (Combined thickness of the Bw1 and Bw2 horizon is 8 to 17 inches)
Bw3--28 to 30 inches; brown (10YR 5/3) ashy silt loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine roots; common very fine tubular and common very fine and fine irregular pores; 5 percent sand-size ash, 0.5 to 2.0 mm. in diameter; neutral (pH 7.0); abrupt wavy boundary. (0 to 4 inches thick)
2R--30 inches; basalt.
TYPE LOCATION: Douglas County, Washington; approximately 3.5 miles southwest of Withrow; about 1,100 feet north and 900 feet east of the southwest corner of section 7, T. 25 N., R. 24 E. (Latitude 47 degrees 40 minutes 26 seconds N, Longitude 119 degrees 52 minutes 17 seconds W)
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 50 to 52 degrees F. These soils are usually dry in the moisture control section for more than the half the time when the soil temperature is above 41 degrees F. The mollic epipedon is 10 to 19 inches thick. The particle-size control section has an estimated moist bulk density of 1.10 to 1.35 g/cc, volcanic glass content of 30 to 60 percent, including 15 to 30 percent sand-size pumice, 0.5 to 2.0 mm. in diameter and 0 to 15 percent rock fragments, acid-oxalate extractable aluminum plus one-half of the acid-oxalate extractable iron of 0.15 to 0.40 percent, 0 to 5 percent calcium carbonate equivalent, 15-bar water retention of 5 to 10 percent, 0 to 15 percent rock fragments, and an apparent field estimated clay content of 5 to 14 percent. Depth to basalt is 20 to 40 inches.
The Ap1 horizon chroma is 2 or 3 dry or moist.
The Ap2 and A horizon chroma is 2 or 3 dry or moist. Reaction is neutral to moderately alkaline
The Bw1 horizon value is 3 or 4 moist, and chroma is 3 or 4 dry and 2 or 3 moist. The texture is ashy fine sandy loam, ashy silt loam, or ashy loam. Reaction is neutral to moderately alkaline
The Bw2 horizon value is 3 or 4 moist, chroma of 3 or 4 dry. Reaction is neutral to moderately alkaline. It is ashy fine sandy loam or ashy sandy loam.
The Bw3 horizon value is 3 or 4 moist, chroma of 3 or 4 dry. The texture is ashy silt loam, ashy loam, ashy fine sandy loam or ashy sandy loam. Reaction is neutral to moderately alkaline.
COMPETING SERIES: These are the Bitner, Brays, Chelan, DelRio, Deskamp, Dryhollow, Emagert, Kester, Weezweed and Yellowhills series. The Chelan series is deep and very deep. The DelRio, Dryhollow, and Yellowhills series are very deep. The Deskamp soils lack a cambic horizon. Bitner soils have a paralithic contact at 20 to 40 inches and have 50 to 90 percent glass. Emagert and Weezweed soils are over 40 inches deep. Brays soils are underlain by granite and the particle-size control section averages 15 to 35 percent rock fragments. Kester soils are slightly to strongly alkaline.
GEOGRAPHIC SETTING: Winblow soils are on mounds and in depressions on nonglaciated plateaus. Slopes are 0 to 20 percent. Winblow soils formed in volcanic ash and loess. Elevation is 1,600 to 2,800 feet. The climate is characterized by warm, dry summers and cool, moist winters. Average annual precipitation is 9 to 12 inches. Average January air temperature is about 27 degrees F., average July air temperature is about 71 degrees F., and average annual air temperature is 48 to 50 degrees F. Frost-free season is 130 to 180 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Aarup, Deercut, Sprauer, Toler, and Whiteye soils all on uplands. Aarup soils are on summits, hill slopes and toe slopes, uplands and are shallow to thick indurated duripan. Argabak soils are in intermound areas of flood-scoured scablands and are very shallow to basalt. Deercut soils are on side slopes and toe slopes on plateaus and have an argillic horizon. Sprauer soils are moderately deep to thick indurated duripan. Toler soils have an argillic horizon. Whiteye soils are shallow to thick indurated duripan.
DRAINAGE AND PERMEABILITY: Well drained; very slow to medium runoff; moderate permeability.
USE AND VEGETATION: Winblow soils are used for wheat and barley production and for livestock grazing or wildlife habitat. The potential native vegetation is bluebunch wheatgrass, Sandberg bluegrass, Idaho fescue, arrowleaf balsamroot, Wyoming big sagebrush and Basin wildrye.
DISTRIBUTION AND EXTENT: North Central Washington. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Douglas County, Washington, 1998.
REMARKS: Diagnostic features and horizons recognized in this pedon are a mollic epipedon from the surface to 16 inches, a cambic horizon from 16 to 30 inches, and basalt bedrock at 30 inches. From the surface to 28 inches it has an estimated 30 to 60 percent volcanic glass including 5 to 25 percent ash, 0.5 to 2.0 mm. in diameter. The control section is the zone from 10 to 30 inches (part of the A, and the Bw1, Bw2, and Bw3 horizons).