LOCATION PLAINVIEW OREstablished Series
TAXONOMIC CLASS: Ashy over loamy-skeletal, glassy over mixed, superactive, mesic Typic Vitritorrands
TYPICAL PEDON: Plainview ashy sandy loam - rangeland, on a 1 percent slope at 3200 feet elevation. (When described (6/86), the soil was dry throughout. Colors are for dry soil unless otherwise noted.)
A1--0 to 11 inches; dark grayish brown (10YR 4/2) ashy sandy loam, very dark brown (10YR 2/2) moist; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; many very fine irregular pores; neutral (pH 6.8); clear smooth boundary.
A2--11 to 16 inches; brown (10YR 5/3) ashy sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine and medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; common very fine and fine vesicular pores; 5 percent gravel; neutral (pH 7.0); gradual smooth boundary. (Combined thickness of the A horizon is 7 to 21 inches)
Bw1--16 to 23 inches; brown (10YR 5/3) ashy sandy loam, dark brown (10YR 3/3) moist; weak fine and medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; common very fine and fine vesicular pores; 10 percent gravel; neutral (pH 7.2); clear smooth boundary. (7 to 20 inches thick)
2Bw2--23 to 27 inches; pale brown (10YR 6/3) very gravelly sandy loam, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few very fine and fine roots; common very fine and fine vesicular pores; 35 percent gravel; neutral (pH 7.2); gradual smooth boundary.
2Bw3--27 to 33 inches; light brownish gray (10YR 6/2) very gravelly sandy loam, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure; slightly hard, firm, nonsticky and nonplastic; common very fine and few fine roots; common very fine and fine vesicular pores; 55 percent gravel; slightly alkaline (pH 7.6); clear smooth boundary. (Combined thickness of the 2Bw horizon is 9 to 27 inches)
3C1--33 to 39 inches; pale brown (10YR 6/3) extremely gravelly sandy loam, dark grayish brown (10YR 4/2) moist; massive; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; common very fine and fine irregular pores; 65 percent gravel and 10 percent cobbles; slightly alkaline (pH 7.6); clear smooth boundary.
3C2--39 to 55 inches; light brownish gray (10YR 6/2) very gravelly loamy sand, very dark grayish brown (10YR 3/2) and dark yellowish brown (10YR 4/4) moist; single grain; loose, nonsticky and nonplastic; common very fine and fine roots; common very fine and fine irregular pores; 50 percent gravel and 5 percent cobbles; slightly alkaline (pH 7.8); abrupt wavy boundary. (Combined thickness of the 3C horizon is 11 to 35 inches)
3Ckqm--55 to 60 inches; very dark grayish brown (10YR 3/2) and light gray (10YR 7/2) indurated duripan with 1 mm of silica lamellae and filaments of carbonates; strongly effervescent; massive; very hard.
TYPE LOCATION: Deschutes County, Oregon; 2,000 feet east and 500 feet south of the NW corner of section 6, T. 16 S., R. 11 E. (Latitude 44 degrees, 13 minutes, 00 seconds N, Longitude 121 degrees, 27 minutes, 16 seconds W)
RANGE IN CHARACTERISTICS: These soils are usually dry. They are dry in all parts of the soil moisture control section for 120 to 150 days (cumulative). The mean annual soil temperature is 48 to 54 degrees F. Depth to glacial outwash deposits (2Bw) is 20 to 40 inches. Depth to bedrock is greater than 60 inches. Depth to a strongly cemented or indurated duripan is 50 inches or more. The pumice sand content (0.5-2.0 mm) of the ash mantle is 20 to 60 percent. The ash mantle contains 50 to 80 percent volcanic glass and glass-coated aggregates in the very fine sand fraction, a phosphate retention of 50 to 70 percent, a 15-bar water content of 5 to 10 percent on dried and undried samples and acid oxalate aluminum plus one-half the acid oxalate iron of 0.40 to 1.0 percent. The ash mantle has a field estimated clay content of 5 to 15 percent. Organic matter content is less than 1 percent throughout the profile.
The A horizon has value of 4 or 5 dry, 2 or 3 moist and chroma of 1 to 3 dry and moist. It is 0 to 10 percent gravel. It is neutral.
The Bw horizon has value of 5 or 6 dry, 3 or 4 moist and chroma of 2 or 3 dry and moist. It is neutral.
The 2Bw horizon has value of 5 or 6 dry, 3 or 4 moist and chroma of 2 or 3 dry and moist. It is very gravelly sandy loam with 30 to 60 percent gravel and 0 to 10 percent cobbles. Total rock fragments range from 35 to 60 percent. It is neutral to slightly alkaline.
The 3C horizon has value of 5 or 6 dry, 3 or 4 moist and chroma of 2 or 3 dry and moist. It is extremely gravelly sandy loam or very gravelly loamy sand with 35 to 50 percent gravel and 5 to 15 percent cobbles. Total rock fragments range from 45 to 65 percent. It is slightly alkaline.
In some pedons the indurated duripan is lacking or is strongly cemented.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Plainview soils are on nearly level outwash plains at elevations of 3000 to 4000 feet. Slopes are 0 to 8 percent. The soils formed in volcanic ash over glacial outwash deposits. The climate is characterized by cool, moist winters and hot, dry summers. The mean annual precipitation is 10 to 12 inches. The mean annual temperature is 47 to 52 degrees F. The frost-free period is 70 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Clinefalls and Tumalo soils. Clinefalls soils are on stream terraces and fans and are ashy-skeletal. Tumalo soils are on outwash plains and have a duripan at 20 to 40 inches.
DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderately rapid above a duripan and very slow within the duripan.
USE AND VEGETATION: These soils are used for irrigated crops and rangeland. Potential native vegetation is western juniper, mountain big sagebrush, antelope bitterbrush, Idaho fescue, and needleandthread.
DISTRIBUTION AND EXTENT: Deschutes Basin of central Oregon MLRA 10. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Deschutes County (Upper Deschutes River Area), Oregon, 1992.
REMARKS: Diagnostic horizons and features in this pedon are:
ochric epipedon - the upper 23 inches of the soil has mollic colors but organic carbon is less than 0.6 percent throughout this thickness.
cambic horizon - from 16 to 33 inches (Bw1, 2Bw2, 2Bw3 horizons).
andic soil properties - from 0 to 23 inches. P-retention is 60 percent glass and glass-coated aggregate in the very fine sand fraction is 65 percent Acid Oxalate aluminium plus one-half the acid oxalate iron is 0.5 percent. The 15-bar water content on dried and undried samples is 6 percent.
The soil has an aridic soil moisture regime based on the 10 to 12 inch precipitation zone and moisture regime for geographically associated soils.
The ash mantle is a deposit from Mt. Mazama.
ADDITIONAL DATA: Partial laboratory data are available for this soil. Reference sample S86OR-017-005 from Deschutes County, Oregon, NSSL, Lincoln, NE, 6/26/87. Data available for the A1, A2 and Bw horizons.