LOCATION GARBUTT ID+NV OREstablished Series
The Garbutt series consists of very deep, well drained soils on fan
terraces, basalt plains, and alluvial fans. They formed in loess and
silty alluvium. Permeability is moderate. Slopes are 0 to 12
percent. The average annual precipitation is about 8 inches and the
average annual temperature is about 51 degrees F.
TAXONOMIC CLASS: Coarse-silty, mixed, superactive, calcareous, mesic Typic Torriorthents
Torriorthents.
TYPICAL PEDON: Garbutt silt loam - rangeland, on a 1 percent slope at
2,400 feet elevation. (Colors are for dry soil unless otherwise
noted.)
A--0 to 5 inches; light brownish gray (10YR 6/2) silt loam, dark
brown (10YR 4/3) moist; strong medium platy structure; slightly hard,
friable; strongly effervescent; moderately alkaline; abrupt smooth
boundary. (3 to 9 inches thick)
C1--5 to 27 inches; light gray (10YR 7/2) very fine sandy loam,
dark brown (10YR 4/3) moist; massive; soft, very friable; violently
effervescent; moderately alkaline; abrupt smooth boundary. (16 to 30
inches thick)
C2--27 to 38 inches; light gray (10YR 7/1) very fine sandy loam,
grayish brown (10YR 5/2) moist; massive; hard, firm; violently
effervescent; moderately alkaline; clear smooth boundary. (8 to 20
inches thick)
C3--38 to 60 inches; light gray (10YR 7/2) very fine sandy loam,
dark grayish brown (10YR 4/2) moist; massive; hard, firm; violently
effervescent; moderately alkaline.
TYPE LOCATION: Owyhee County, Idaho; about 16 miles southwest of
Mountain Home; 2,200 feet north and 2,500 feet east of the southwest
corner of section 30, T.4S., R.4E.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 47 to 54 degrees F
Control section-percent clay - 12 to 18
Texture - very fine sandy loam or silt loam
Reaction - mildly to strongly alkaline
Mineralogy - mixed with 1 or more layers having 20 to 50 percent
volcanic glass in the sand and silt fraction.
A horizon
Hue- 10YR or 2.5Y
Value- 5 through 8 dry, 3 through 6 moist
Chroma- 2 through 4
C horizons
Value- 6 through 8 dry, 4 through 6 moist
Chroma- 1 through 4
Calcium carbonate - 3 to 15 percent calcium carbonate
COMPETING SERIES: These are the Penoyer, Smaug, and Yipor series.
Penoyer, Smaug and Yipor soils lack layers with 20 to 50 percent
volcanic glass.
GEOGRAPHIC SETTING: Garbutt soils are on alluvial fans, low terraces,
and basalt plains at elevations of 2,000 to 5,400 feet. They formed in
alluvium dominantly from lacustrine siltstone. Slopes are 0 to 12
percent. Average annual precipitation is 6 to 10 inches. Average
annual temperature is 45 to 53 degrees F. The frost-free period is 110
to 165 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Baldock, Bramwell,
Owyhee, Stanfield, and Turbyfill soils. Baldock soils are fine-loamy
and have mottles above 20 inches. Bramwell soils are fine-silty and
somewhat poorly drained. Owyhee soils have cambic horizons and are 20
to 35 inches deep to laminated lacustrine sediments. Stanfield soils
have duripans and Turbyfill soils are coarse-loamy. Baldock and
Bramwell soils occur on lower, wetter landscape positions. The other
associated soils are on landscape positions similar to Garbutt soils.
DRAINAGE AND PERMEABILITY: Well drained; slow or medium runoff;
moderate permeability.
USE AND VEGETATION: Irrigated areas are used for production of beans,
corn, alfalfa, sugar beets, small grains, hay and pasture. Potential
vegetation in the natural plant community is winterfat, bud sagebrush,
shadscale, bottlebrush squirreltail, Sandberg bluegrass, and Indian
ricegrass.
DISTRIBUTION AND EXTENT: Southwestern and south central Idaho and
eastern Oregon. The soils are extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Owyhee County, Idaho, 1973.
REMARKS: Diagnostic horizons and other features recognized in this
pedon are:
Ochric epipedon - 0 to 9 inches (the A horizon)
Particle-size control section - 10 to 40 inches
National Cooperative Soil Survey