LOCATION MATSON WA
Established Series
Rev. SMR/KDPL
09/2019
MATSON SERIES
Landscape--plateaus
Landform--structural benches
Slope--0 to 20 percent
Parent material--loess over glacial fluvial deposits
Mean annual precipitation--about 230 mm
Mean annual air temperature--about 10 degrees C
Depth class--deep to cemented pan
Drainage class--well drained
Soil moisture regime--aridic
Soil temperature regime--mesic
Soil moisture subclass--xeric
TAXONOMIC CLASS: Coarse-silty, mixed, superactive, mesic Xeric Petrocambids
TYPICAL PEDON: Matson silt loam in an area of rangeland, on a 3-percent, east-facing, linear, convex slope at an elevation of 370 m
A--0 to 5 cm; silt loam, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; weak fine granular structure and moderate medium and fine platy; soft, very friable, nonsticky and slightly plastic; common very fine roots; common very fine pores; neutral (pH 6.8); abrupt smooth boundary
Bw1--5 to 28 cm; silt loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak medium subangular blocky structure and moderate medium prismatic; soft, very friable, slightly sticky and slightly plastic; common very fine and fine roots; common very fine, fine, and medium pores; neutral (pH 7.1); clear smooth boundary
Bw2--28 to 51 cm; silt loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak medium subangular blocky structure and weak medium prismatic; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and fine roots; common very fine, fine, and medium pores; 5 percent gravel; slightly alkaline (pH 7.5); clear smooth boundary
Bk1--51 to 66 cm; silt loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; common fine and very fine roots; common very fine, fine, and medium pores; 5 percent gravel; slightly effervescent, disseminated carbonates; strongly alkaline (pH 8.6); gradual wavy boundary
2Bk2--66 to 86 cm; silt loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; massive; hard, firm, nonsticky and slightly plastic; common very fine roots; common very fine, fine, and medium pores; 13 percent gravel; strongly effervescent, disseminated carbonates; strongly alkaline (pH 8.9); clear smooth boundary
3Bk3--86 to 114 cm; very gravelly silt loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 4/4) moist; massive; hard, firm, moderately sticky and moderately plastic; common very fine roots; common very fine pores; 30 percent gravel and 15 percent cobbles; strongly effervescent, disseminated carbonates; strongly alkaline (pH 8.7); clear smooth boundary
3Bkqm--114 to 150 cm; indurated gravelly duripan cemented with silica and carbonates
TYPE LOCATION: Yakama Nation, Yakima County, Washington, about 26 km south of Toppenish; about 275 m south and 720 m east of the northwest corner of section 27, T. 8 N., R. 21 E.; Bluelight NW quadrangle; latitude 46.154605, longitude -120.172600, datum WGS 84 (coordinates estimated from section, township, and range)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--10 to 13 degrees C
Soil moisture--continuously dry in all parts between depths of 10 and 30 cm from about May 1 to October 1
Particle-size control section--5 to 10 percent clay; less than 15 percent sand coarser than very fine sand
Organic matter content--less than 1 percent in upper 20 cm, after mixing
Depth to secondary carbonates--50 to 100 cm
Depth to indurated duripan--100 to 150 cm
A horizon
Value--4 to 6 dry, 3 to 5 moist
Chroma--2 to 4 moist or dry
Reaction--6.6 to 7.8
Thickness--5 to 18 cm
Bw horizon
Value--5 or 6 dry, 3 or 4 moist
Chroma--2 to 4 moist or dry
Reaction--6.6 to 7.8
Combined thickness--33 to 89 cm
Bk horizon
Hue--10YR, 2.5Y
Value--5 to 8 dry, 4 to 6 moist
Chroma--2 to 4 moist or dry
Texture of fine-earth fraction--silt loam, very fine sandy loam
Rock fragment content--10 to 50 percent
Calcium carbonate equivalent--2 to 15 percent
Reaction--7.9 to 9.0
Combined thickness--38 to 76 cm
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--300 to 460 m
Climate--semiarid; warm, dry summers; cool, moist winters
Mean annual precipitation--150 to 250 mm
Mean annual air temperature--8 to 12 degrees C
Frost-free season--120 to 200 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Kennewick--no lithic contact within a depth of more than 150 cm; on dissected side slopes
Prosser--coarse-loamy particle-size class; 50 to 100 cm (moderately deep) to a lithic contact (basalt); on plateaus
Sagehill--calcic horizon; coarse-loamy particle-size class; on side slopes
Sagemoor--laminated sediment; no lithic contact within a depth of more than 150 cm; on side slopes
Shano--no cemented material within a depth of more than 150 cm; on plateaus and side slopes
Taunton--50 to 100 cm (moderately deep) to an indurated duripan; coarse-loamy particle-size class; on plateaus
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--moderately high
USE AND VEGETATION:
Use--livestock grazing
Native vegetation--bluebunch wheatgrass, Sandberg bluegrass, spiny hopsage, Wyoming big sagebrush
DISTRIBUTION AND EXTENT: Central Washington; MLRAs 7 and 8; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Yakama Nation, Yakima County, Washington; 2014
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Cambic horizon--zone from 5 to 51 cm
*Secondary carbonates--zone from 51 to 114 cm
*Depth to duripan--114 cm
National Cooperative Soil Survey
U.S.A.