LOCATION ROZA                    WA+ID

Established Series
Rev. CDL/RJE/TLA
09/2019

ROZA SERIES

Landscape--hills, valleys
Landform--alluvial fans, dissected terraces
Slope--0 to 60 percent
Parent material--fine-textured interbedded sediment of the Ellensburg Formation and alluvium
Mean annual precipitation--about 250 mm
Mean annual air temperature--about 11 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--aridic
Soil temperature regime--mesic
Soil moisture subclass--xeric

TAXONOMIC CLASS: Fine, smectitic, mesic Xerertic Haplocambids

TYPICAL PEDON: Roza clay loam in an area of rangeland

A--0 to 5 cm; clay loam, grayish brown (10YR 5/2) dry, dark grayish brown (10YR 4/2) moist; strong fine and very fine granular structure; hard, firm, moderately sticky and moderately plastic; common fine roots; common very fine tubular pores; vertical cracks from a polyhedron; slightly alkaline (pH 7.4); abrupt wavy boundary

BA--5 to 28 cm; clay loam, grayish brown (10YR 5/2) dry, dark grayish brown (10YR 4/2) moist; moderate coarse angular blocky structure; very hard, firm, moderately sticky and moderately plastic; common fine roots; many fine and very fine tubular pores; vertical cracks between peds; slightly alkaline (pH 7.8); abrupt wavy boundary

Bw1--28 to 48 cm; silty clay, light brownish gray (10YR 6/2) dry, grayish brown (10YR 5/2) moist; strong medium angular blocky structure; very hard, firm, moderately sticky and moderately plastic; few fine roots; many fine and very fine tubular pores; vertical cracks between peds; slightly alkaline (pH 7.8); abrupt wavy boundary

Bw2--48 to 66 cm; silty clay, light brownish gray (10YR 6/2) dry, grayish brown (10YR 5/2) moist; weak coarse prismatic structure; hard, firm, moderately sticky and moderately plastic; few fine roots; common fine and very fine tubular pores; slightly alkaline (pH 7.8); clear wavy boundary

Bw3--66 to 97 cm; silty clay loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; massive; hard, firm, moderately sticky and moderately plastic; few fine roots; common fine and very fine tubular pores; moderately alkaline (pH 8.0); abrupt wavy boundary

Bk1--97 to 114 cm; silty clay loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; massive; very hard, firm, moderately sticky and moderately plastic; few fine roots; common fine tubular pores; mycelial lime, violently effervescent; moderately alkaline (pH 8.2); clear wavy boundary

Bk2--114 to 150 cm; clay loam, light gray (2.5Y 7/2) dry, grayish brown (2.5Y 5/2) moist; massive; very hard, very firm, moderately sticky and moderately plastic; weakly laminated; mycelial lime and lime coatings on laminations, violently effervescent; moderately alkaline (pH 8.2)

TYPE LOCATION: Yakima County, Washington, about 90 m east and 35 m south of the north quarter corner of section 14, T. 14 N., R. 18 E.

RANGE IN CHARACTERISTICS:
Depth to calcareous sediment--45 to 150 cm
Mean annual air temperature--9 to 12 degrees C
Soil moisture--dry between depths of 10 and 30 cm more than one-half to three-fourths the time when the soil temperature is higher than about 4 degrees C
Particle-size control section--35 to 60 percent clay; 0 to 5 percent rock fragments
Vertical cracks--1 to 2 cm wide; extend from the surface to a depth of about 50 cm; closed more than 60 days in most years
Depth to secondary carbonates--41 to 100 cm

A and BA horizons
Hue--10YR, 2.5Y
Value--5 to 7 dry, 4 or 5 moist
Chroma--2 or 3 moist or dry
Texture--silty clay, loam, clay, clay loam; common pockets or concentrations of uncoated fine sand
Thickness of A horizon--5 to 10 cm
Thickness of BA horizon--0 to 30 cm

Bw horizon
Hue--10YR, 5Y, 2.5Y
Value--5 or 6 dry, 4 or 5 moist
Chroma--2 to 4 dry or moist
Texture--silty clay, silty clay loam, clay, clay loam
Reaction--7.4 to 8.4
Combined thickness--36 to 89 cm

Bk horizon
Hue--10YR, 5Y, 2.5Y
Value--6 or 7 dry, 4 or 5 moist
Chroma--2 to 4 moist or dry
Texture--clay, silty clay loam, clay loam, silty clay
Reaction--7.4 to 8.4
Combined thickness--greater than 51 cm

COMPETING SERIES:
Beeman--sodium adsorption ration of more than 13 throughout

GEOGRAPHIC SETTING:
Elevation--typically 400 to 760 m, but ranges from 1375 to 1400 m in Idaho
Climate--semiarid; hot, dry summers; cool, moist winters
Mean annual precipitation--200 to 310 mm
Mean January air temperature--about -2 degrees C
Mean July air temperature--about 23 degrees C
Mean annual air temperature--about 9 to 11 degrees C
Frost-free season--typically 130 to 170 days, but 110 to 120 days in Idaho

GEOGRAPHICALLY ASSOCIATED SOILS:
Cowiche--on uplands
Ritzville--on hillslopes
Selah--on old alluvial fans; less than 35 percent clay in particle-size control section

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--moderately low

USE AND VEGETATION:
Use--livestock grazing, production of irrigated orchard crops and pasture
Native vegetation--bluebunch wheatgrass, Sandberg bluegrass, big sagebrush, winterfat

DISTRIBUTION AND EXTENT: South-central Washington and southern Idaho; MLRA 8; small extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Yakima County, Washington; 1947

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National Cooperative Soil Survey
U.S.A.