LOCATION KAVON ID

Established Series
Rev. DL/DA/HBM
04/2019

KAVON SERIES

The Kavon series consists of very deep, well drained soils that formed in glacial till and colluvium from welded tuff and volcanic ash. They are on hillsides. Permeability is moderately slow. Slopes range from 5 to 35 percent. The average annual precipitation is about 560 mm, and the average annual temperature is about 5.6 degrees C.

TAXONOMIC CLASS: Loamy-skeletal, mixed, subactive, frigid Xeric Palehumults

TYPICAL PEDON: Kavon extremely gravelly loam - on an east-facing slope of 20 percent under rangeland vegetation at 2,265 meter elevation. When described on August 20, 1981, the soil was dry throughout. (Colors are for dry soil unless otherwise noted.)

A1--0 to 10 cm; brown (10YR 4/3) extremely gravelly loam, very dark brown (10YR 2/2) moist; weak fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; many very fine tubular pores; 60 percent gravel, 3 percent boulders; extremely acid (pH 4.2); clear smooth boundary. (8 to 15 cm thick)

A2--10 to 30 cm; dark grayish brown (10YR 4/2) very gravelly loam, very dark brown (10YR 2/2) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; many very fine tubular pores; 50 percent gravel; extremely acid (pH 4.4); gradual wavy boundary. (13 to 28 cm thick)

Bt1--30 to 51 cm; brown (10YR 5/3) very gravelly loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; hard, firm, slightly sticky and slightly plastic; few very fine roots; common very fine tubular pores; few faint clay films on faces of peds and in pores; 50 percent gravel; extremely acid (pH 4.4); clear smooth boundary. (18 to 50 cm thick)

Bt2--51 to 99 cm; brown (10YR 4/3) very gravelly loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; hard, firm, slightly sticky and slightly plastic; few very fine tubular pores; few faint clay films on faces of peds and in pores; 50 percent gravel; extremely acid (pH 4.2); clear smooth boundary. (38 to 89 cm thick)

Bt3--99 to 157 cm; light yellowish brown (10YR 6/4) extremely cobbly clay loam, dark yellowish brown (10YR 4/4) moist; strong fine angular blocky structure; hard, firm, moderately sticky and moderately plastic; few very fine tubular pores; common distinct clay films on faces of peds and in pores; 40 percent gravel, 20 percent cobbles, 5 percent stones; extremely acid (pH 4.2).

TYPE LOCATION: Twin Falls County, Idaho; about 23 miles southwest of Rogerson, Idaho; about 2,300 feet south and200 feet east of the northwest corner of section 21, T. 16 S., R. 13 E.; USGS Taylor Canyon 7.5 minute topographic quadrangle; latitude 42 degrees 01 minutes 15 seconds N and longitude 114 degrees 56 minutes 56 seconds W; WGS84 Decimal Degrees 42.0208333 latitude, -114.9488889 longitude.

RANGE IN CHARACTERISTICS:

Depth to welded tuff - 152 cm or more.
Thickness of umbric epipedon - 75 to 127 cm.
Clay content in control section - 20 to 30 percent
Coarse fragments in control section - 40 to 80 percent
Average annual soil temperature - 3.9 to 5.6 degrees C.
Average summer soil temperature - 12.7 to 15 degrees C.
Typic xeric moisture regime.

A1 and A2 horizons
Color chroma - 1 through 3 dry or moist
Reaction - very strongly acid or extremely acid
Base saturation - 5 to 20 percent (By sum of cations)

Bt1 and Bt2 horizon
Color value, dry - 4 through 6
Value, moist - 3 or 4
Chroma - 2 through 4 dry or moist
Texture - GRV-L or GRX-CL
Clay content 20 to 30 percent
Gravel - 40 to 70 percent
Cobbles - 0 to 10 percent
Base saturation - 4 to 20 percent (By sum of cations)

Bt3 horizon
Color hue - 10YR or 7.5YR
Chroma - 3 or 4 dry or moist
Texture - CBX-C, CBX-CL, or GRX-CL
Clay content - 30 to 45 percent
Gravel - 35 to 40 percent
Cobbles - 20 to 40 percent
Stones - 5 to 10 percent
Base saturation - 5 to 20 percent (By sum of cations)

COMPETING SERIES: There are no other series in this family. The Buckpeak series in a closely related family has a fine-loamy particle-size control section and a mesic soil temperature regime.

GEOGRAPHIC SETTING: Kavon soils are on hillsides. The slope ranges from 5 to 35 percent. The soils formed in glacial till and colluvium from welded tuff and volcanic ash. Elevations are 2,075 to 2,350 meters. The average annual precipitation ranges from 510 to 640 mm. The average annual temperature is 4.4 to 6.7 degrees C. The frost free season is 20 to 50 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dehana, Hogmalat, Keman, and Rutherford soils. Dehana soils are fine-loamy. Hogmalat soils are shallow to bedrock, and occur on summit shoulders. Keman soils occur on summit backslopes, and have 60 to 70 percent base saturation in the upper 40 inches. Rutherford soils are moderately deep to bedrock, and occur on ridgetops and dipslopes.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained, rapid runoff; moderately slow saturated hydraulic conductivity.

USE AND VEGETATION: Kavon soils are used for rangeland. Native vegetation is western needlegrass, slender wheatgrass, and snowbrush ceanothus.

DISTRIBUTION AND EXTENT: Kavon soils are of small extent in south central Idaho.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Twin Falls County, Idaho, 1992.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Umbric epipedon - 0 to 99 cm.

Argillic horizon - 30 to 157 cm.

ADDITIONAL DATA: Laboratory data is available from NSSL. Soil Survey Sample Number is S81ID-083-000.

CEC changed from superactive to subactive based on criteria listed.

National Cooperative Soil Survey
U.S.A.