LOCATION KAVON IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Xeric Palehumults
TYPICAL PEDON: Kavon very gravelly loam - on an east-facing slope of 20 percent under rangeland vegetation at 7,420 feet elevation. When described on August 20, 1981, the soil was dry throughout. (Colors are for dry soil unless otherwise noted.)
A1--0 to 4 inches; brown (10YR 4/3) very 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. (3 to 6 inches thick)
A2--4 to 12 inches; 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. (5 to 11 inches thick)
Bt1--12 to 20 inches; 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 thin clay films on faces of peds and in pores; 50 percent gravel; extremely acid (pH 4.4); clear smooth boundary. (7 to 20 inches thick)
Bt2--20 to 39 inches; 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 thin clay films on faces of peds and in pores; 50 percent gravel; extremely acid (pH 4.2); clear smooth boundary. (15 to 35 inches thick)
Bt3--39 to 62 inches; light yellowish brown (10YR 6/4) extremely cobbly clay loam, dark yellowish brown (10YR 4/4) moist; strong fine angular blocky structure; hard, firm, sticky and plastic; few very fine tubular pores; common moderately thick 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; in the southwest 1/4, southwest 1/4, northwest 1/4 sec. 21, T. 16 S., R. 13 E.
RANGE IN CHARACTERISTICS:
Depth to welded tuff - 60 inches or more
Thickness of umbric epipedon - 30 to 50 inches
Clay content in control section - 20 to 30 percent
Coarse fragments in control section - 40 to 80 percent
Average annual soil temperature - 39 to 42 degrees F.
Average summer soil temperature - 55 to 59 degrees F.
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 6,800 to 7,700 feet. The average annual precipitation ranges from 20 to 25 inches. The average annual temperature is 40 to 44 degrees F. 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 PERMEABILITY: Well drained, rapid runoff; moderately slow permeability.
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 OFFICE RESPONSIBLE: Reno, Nevada
SERIES ESTABLISHED: Twin Falls County, Idaho, 1992.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Umbric epipedon - 0 to 39 inches
Argillic horizon - 12 to 62 inches
Soil Temperature Regime - cryic
The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.
ADDITIONAL DATA: Laboratory data is available from NSSL. Soil Survey Sample Number is S81ID-083-000.
The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.