LOCATION ROLLINGER WAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Vitrandic Argixerolls
TYPICAL PEDON: Rollinger ashy silt loam - cultivated, on a 14 percent north-facing slope at an elevation of 2,120 feet. (When described on October 27, 1993, the soil was dry throughout. Colors are for dry soil unless otherwise stated.)
Ap1--0 to 6 inches; dark grayish brown (10YR 4/2) ashy silt loam, very dark brown (10YR 2/2) moist; weak and moderate fine and medium blocky structure parting to fine granular; soft, very friable, slightly sticky and slightly plastic; common fine and medium, few very fine roots; many very fine and fine tubular pores; neutral (pH 7.2); abrupt smooth boundary.
Ap2--6 to 11 inches; brown (10YR 4/3) ashy silt loam, very dark grayish brown (10YR 3/2) moist; moderate coarse prismatic structure parting to moderate fine and medium subangular blocky; slightly hard, very friable, slightly sticky and slightly plastic; common fine, medium and few coarse roots; common fine and few medium tubular pores; slightly alkaline (pH 7.4); abrupt smooth boundary. (Combined Ap horizon is 7 to 12 inches thick)
2Bt1--11 to 19 inches; brown (10YR 5/3) silty clay loam, dark brown (10YR 3/3) moist; strong coarse prismatic structure parting to strong fine and medium subangular blocky; hard, very friable, slightly sticky and slightly plastic; common fine and medium roots; common fine and medium interstitial and tubular pores; few faint clay films lining pores and on faces of peds; slightly alkaline (pH 7.4); clear wavy boundary.
2Bt2--19 to 27 inches; brown (10YR 5/3) silty clay loam, dark brown (10YR 3/3) moist; strong coarse prismatic structure parting to strong fine and medium subangular blocky; hard, friable, slightly sticky and slightly plastic; common fine and medium roots; common fine and medium interstitial and tubular pores; few faint clay films lining pores and on faces of peds; slightly alkaline (pH 7.6); abrupt wavy boundary. (Combined Bt horizon is 14 to 20 inches thick)
3Bw--27 to 31 inches; brown (10YR 5/3) silt loam, dark brown (10YR 3/3) moist; moderate medium prismatic structure parting to fine subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine and medium roots; common fine and medium tubular pores; irregular pockets of pale brown (10YR 6/3) ash; 10 percent pebbles; slightly alkaline (pH 7.6); clear wavy boundary. (0 to 6 inches thick)
3Bk--31 to 40 inches; brown (10YR 5/3) silt loam, dark brown (10YR 3/3) moist; moderate medium prismatic structure parting to fine subangular blocky; slightly hard, friable, slightly sticky and nonplastic; few very fine, fine and medium roots; many fine and medium interstitial and tubular pores; common distinct lime coats in root channels and pores; slight effervescence; slightly alkaline (pH 8.0); abrupt wavy boundary. (8 to 10 inches thick)
4Btk--40 to 48 inches; brown (10YR 4/3) silty clay loam, dark brown (10YR 3/3) moist; moderate fine and medium prismatic structure; hard, friable, sticky and plastic; few fine and medium roots; many fine and medium irregular and common fine and medium tubular pores; few medium soft masses of light gray (10YR 7/2) carbonate; many distinct dark brown (7.5YR 4/3) clay films lining pores and on faces of peds; slight effervescence; moderately alkaline (pH 8.4); clear wavy boundary. (0 to 12 inches thick)
5Bk1--48 to 51 inches; pale brown (10YR 6/3) silt loam, dark brown (10YR 3/3) moist; weak fine and medium prismatic structure; slightly hard, friable, slightly sticky and slightly plastic; few fine roots; many fine and medium irregular and few fine tubular pores; moderate effervescence, strongly alkaline (pH 8.6); clear wavy boundary. (0 to 6 inches thick)
6Bk2--51 to 60 inches; brown (10YR 5/3) sandy loam, dark brown (10YR 3/3) moist; moderate medium and coarse prismatic structure; hard, firm, slightly sticky and nonplastic; few fine roots; many fine and medium irregular, common fine and medium vesicular and few fine tubular pores; moderate effervescence; strongly alkaline (pH 8.6).
TYPE LOCATION: Kittitas County, Washington, about 6 miles south of Kittitas, WA, about 1,000 feet east and 1,800 feet south of the northwest corner of section 12, T. 16 N., R. 19 E.; USGS Kittitas topographic quadrangle; lat. 46 degrees 53 minutes 34 seconds N. and long. 120 degrees 23 minutes 59 seconds W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature at a depth of 20 inches is 47 to 54 degrees F. These soils are usually moist but are dry in all parts of the moisture control section for 100 to 120 consecutive days following the summer solstice. Thickness of the mollic epipedon is more than 40 inches. Depth to secondary carbonates range from 28 to 42 inches. The upper 7 to 11 inches has an estimated moist bulk density of 1.15 to 1.30 g/cc, volcanic glass content of 5 to 20 percent, acid oxalate extractable aluminum plus one-half of the acid-oxalate extractable iron of 0.4 to 0.7 percent, and 15-bar water retention of 5 to 10 percent for air dried samples. The particle-size control section averages 25 to 30 percent clay in the fine earth fraction and averages less than 15 percent rock fragments by volume.
The Ap horizons have value of 4 or 5 dry, 2 or 3 moist, and chroma of 2 or 3 dry or moist.
The 2Bt horizon has value of 4 or 5 dry, 2 or 3 moist. It has strong or moderate prismatic or subangular blocky structure. This horizon is neutral to slightly alkaline.
The 3Bw horizon has value of 4 or 5 dry, 2 or 3 moist and chroma of 2 or 3 dry or moist. It is weak or moderate prismatic or subangular blocky and may contain up to 15 percent rock fragments. This horizon is absent in some pedons.
The 3Bk horizon has value of 4 or 5 dry, chroma of 2 or 3 dry or moist. It is loam or silt loam. It is slightly or moderately alkaline.
The 4Btk horizon has value of 4 or 5 dry, 2 or 3 moist. It is slightly or moderately alkaline.
The 5Bk and 6Bk horizons have value of 5 or 6 dry, 3 or 4 moist, and chroma of 3 or 4 dry or moist. They are silt loam, loam, sandy loam or gravelly sandy loam.
COMPETING SERIES: These are the Georgecreek, Glenrose, Hillcreek (T), Morical, Mozen (T), Pachneum (T), Ralock (T), Shushuskin (T), Teewee, Tolius, Umperon (T), Vollinger (T), Wenner (T), and Wockum soils series. Georgecreek soils are 40 to 60 inches to a paralithic contact, have more than 25 percent medium, coarse and very coarse sand in the particle- size control section and are dry for 75 to 90 days. Glenrose soils have a mollic epipedon less than 20 inches thick, average less than 25 percent clay in the fine earth fraction and have 10 to 25 percent medium, coarse and very coarse sand in the particle-size control section. Hillcreek soils are dry for 60 to 90 consecutive days. Morical soils are 20 to 40 inches to a paralithic contact and are dry for 75 to 105 days. Mozen and Shushuskin soils are 20 to 40 inches deep to a lithic contact. Pachneum and Umperon soils are dry for 75 to 90 consecutive days. Ralock soils have 15 to 30 percent coarse fragments in the particle-size control section and the mollic epipedon is 20 to 25 inches thick. Teewee soils are 40 to 60 inches to a paralithic contact, the mollic epipedon is less than 20 inches thick and 15-bar water retention is 10 to 15 percent. Tolius soils lack silty clay loam textures between 20 and 40 inches and have C horizons which can have up to 30 percent gravel and 15 percent cobbles. Vollinger soils have secondary carbonates at a depth of 43 to 60 inches. Wenner soils have a mollic epipedon 10 to 18 inches thick and are dry for 90 to 100 days. Wockum soils are dry for 90 to 100 days following the summer solstice and the mollic epipedon is 20 to 30 inches thick.
GEOGRAPHIC SETTING: Rollinger soils are on north-facing hillslopes and piedmont slopes and have slopes of 5 to 60 percent. These soils formed in loess and some slope alluvium. Elevations are 1,500 to 2,900 feet. These soils are in a semiarid climate with warm, dry summers and cool, moist winters. Average annual precipitation is 12 to 15 inches. Average January temperature is about 25 degrees F.; average July temperature is about 25 degrees F.; and average annual temperature is about 48 to 50 degrees F. Frost-free season is 130 to 170 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Benwy, Laric, Selah and Zen soils. Benwy soils are on structural benches, footslopes and toeslopes and have a mollic epipedon less than 20 inches thick. Laric soils are on ridgetops and structural benches and are 5 to 12 inches to a lithic contact. Selah soils are on toeslopes and have a duripan at 20 to 40 inches. Zen soils are on hillslopes and ridgetops and have a lithic contact at a depth of 20 to 40 inches.
DRAINAGE AND PERMEABILITY: Well drained; medium to very rapid runoff; moderately slow permeability.
USE AND VEGETATION: Used for cropland and range. Dryland crops are winter wheat, spring wheat, and barley in a summer fallow system and hay crops. Native vegetation is bluebunch wheatgrass, Sandberg bluegrass, and big sagebrush.
DISTRIBUTION AND EXTENT: Kittitas County, Washington. Rollinger series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Kittitas County, Washington, Yakima Training Center, 1994.
REMARKS: Partial laboratory data are available. Diagnostic horizon and features recognized in this pedon include: Mollic epipedon - 0 to 31 inches (Ap, Bt, 2Bw and 2Bk horizons) Argillic horizon - 11 to 27 inches (2Bt1 and 2Bt2 horizons) Cambic horizon - 27 to 31 inches (3Bw horizon) Calcic horizon - 31 to 60 inches (3Bk1, 4Btk2, 5Bk3 and 6Bk4 horizons) PSCS - zone from 11 to 27 inches (2Bt1 and 2Bt2 horizons)