LOCATION HYPRAIRIE WAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Pachic Ultic Argixerolls
TYPICAL PEDON: Hyprairie silt loam - cultivated on a 4 percent southeast-facing slope at an elevation of 2,080 feet. (Colors are for dry soils unless otherwise noted.)
Ap--0 to 7 inches; dark grayish brown (10YR 4/2) silt loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots; many fine irregular pores; moderately acid (pH 5.8); abrupt smooth boundary. (5 to 8 inches thick)
A--7 to 18 inches; dark grayish brown (10YR 4/2) silt loam, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; soft, friable, nonsticky and slightly plastic; common very fine and few fine roots; many fine irregular, common fine and few coarse tubular pores; moderately acid (pH 5.9); clear smooth boundary. (8 to 14 inches thick)
AB--18 to 25 inches; brown (10YR 4/3) silt loam, dark brown (10YR 3/3) moist; weak fine and medium subangular blocky structure; soft, friable, nonsticky and slightly plastic; few very fine roots; common fine tubular and few fine irregular pores; moderately acid (pH 6.0); clear smooth boundary. (0 to 10 inches thick)
2Bt1--25 to 48 inches; yellowish brown (10YR 5/4) silt loam, dark yellowish brown (10YR 3/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; common fine tubular and few fine irregular pores; few faint clay films in pores; 10 percent gravel; slightly acid (pH 6.2); clear smooth boundary. (20 to 25 inches thick)
2Bt2--48 to 60 inches; yellowish brown (10YR 5/4) gravelly clay loam, dark yellowish brown (10YR 3/4) moist; moderate medium subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; common fine tubular and many fine and medium irregular pores; common distinct clay films on faces of peds and in pores; 25 percent gravel; slightly acid (pH 6.5).
TYPE LOCATION: Klickitat county, Washington; about 5 miles northeast of Lyle; 2,475 feet north and 750 feet west of the southeast corner of section 9, T. 3 N., R. 13 E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 48 to 51 degrees F. These soils are usually moist, but are dry in the moisture control section for 60 to 75 consecutive days following summer solstice. The particle-size control section has from 18 to 35 percent clay and 5 to 25 percent gravel. The mollic epipedon is 20 to 30 inches thick and includes the A and AB horizons.
The A horizon has hue of 7.5YR or 10YR, value of 4 or 5 dry, 2 or 3 moist and chroma of 2 or 3 dry or moist. Reaction is moderately acid or slightly acid.
The AB horizon has hue of 7.5YR or 10YR, value of 4 or 5 dry. Reaction is moderately acid or slightly acid.
The 2Bt horizon has hue of 7.5YR or 10YR, value of 4 to 6 dry and chroma of 3 to 6 dry or moist. Texture is loam, silt loam, silty clay loam, clay loam, or gravelly clay loam. Reaction is slightly acid or neutral.
COMPETING SERIES: These are the Almaden (T),
Buckeye,
Campfour,
Cartwright,
Elmore,
Kiakus,
Lauby,
Newlig,
Nisene,
Paragon,
Roseburg,
Swalecreek, and
Yaxing series.
Almaden soils this series cannot be competed as it is not in the OSD database
Buckeye soils - 20 to 40 inches to a lithic contact (greenstone)
Campfour soils - dry 80 to 100 consecutive days; mollic epipedon 20 to 40 inches thick and includes the upper part of the argillic horizon
Cartwright soils - 5 to 25 percent gravel in pscs of granite origin and do not have a discontinuity (2Bt horizon)
Elmore soils - 40 to 60 inches to a lithic contact (rhyolite)
Kiakus soils - 20 to 40 inches to a lithic contact (basalt)
Lauby soils - 40 to more than 60 inches to a paralithic contact; dry 45 to 60 consecutive days
Newlig soils - do not have a discontinuity (2Bt horizon); 40 to 60 inches to the base of argillic horizon
Nisene soils - 40 to 60 inches to a paralithic contact (sandstone, shale); MAST of 56 to 58 degrees F.
Paragon soils - 20 to 40 inches to a paralithic contact (andesite); dry 80 to 100 consecutive days
Roseburg soils - MAST of 52 to57 degrees F.; 40 to 60 inches to base of argillic horizon; 0 to 15 percent rounded gravel in pscs
Swalecreek soils - dry for 75 to 90 consecutive days; have 2Btc horizons
Yaxing soils - 40 to 60 inches to base of the argillic horizon; dry for 75 to 90 consecutive days; slightly alkaline throughout.
GEOGRAPHIC SETTING: Hyprairie soils are on dissected plateaus, hillslopes and mountain slopes at elevations of 1,000 to 3,400 feet. Slopes are 2 to 65 percent. They formed in loess over old alluvium. The high elevation phase formed in sandstone colluvium and loess on mountains and hillslopes at elevations of 2,000 to 3,400 feet. Summers are warm and dry, winters are cool and moist. The mean annual precipitation is 15 to 25 inches. The average January temperature is 28 degrees F. and the average July temperature is 68 degrees F. The mean annual temperature is 46 to 50 degrees F. The frost-free season is 110 to 150 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Gunn, Kiakus, and Leidl soils. Gunn soils have an ochric epipedon and are on plateaus, benches, and side slopes. Leidl and Kiakus soils have a lithic contact at a depth of 20 to 40 inches and are on plateaus and side slopes.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; moderately slow permeability.
USE AND VEGETATION: These soils are used mainly for cropland. Small grains, hay and pasture are principal crops. Native vegetation is Oregon white oak, antelope bitterbrush, Idaho fescue, bluebunch wheatgrass, arrowleaf balsamroot and eriogonum.
DISTRIBUTION AND EXTENT: Klickitat County, Washington. MLRA 6.The series is of small extent.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Chelan County, WA; Cashmere Mt. Soil Survey, 1995.
REMARKS: Diagnostic horizons recognized in this pedon are:
Mollic epipedon - the zone from 0 to 25 inches
Argillic horizon - the zone from 25 to 60 inches
Particle-size control section - the zone from 25 to 45 inches
Note: 4/03 - This series needs further investigation as to its relationship with the competing Yaking series. The dry days of 60 to 75 actually seem too low and at the least, may be expanded to 60 to 90 if not revised to 75 to 90 consecutive dry days.The high elevation phase appears to be more similar to the Yaxing concept over sandstone and MLRA 6.
ADDITIONAL DATA: Laboratory data available. (Characterization S82WA-039-3)