LOCATION CAPONA OR+CA
Established Series
Rev. RPO/AON/TDT/JVC/BTH/CEG
06/2022
CAPONA SERIES
Landscape--intermontane basins
Landform--plateaus, structural benches, rock pediments
Slope--0 to 35 percent
Parent material--colluvium and residuum derived from volcanic rocks, with an influence of volcanic ash throughout
Mean annual precipitation--about 305 mm
Mean annual air temperature--about 8.9 degrees C
Depth class--moderately deep
Drainage class--well drained
Soil moisture regime--aridic
Soil temperature regime--mesic
Soil moisture subclass--xeric
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Vitritorrandic Haploxerolls
TYPICAL PEDON: Capona loam, rangeland
A--0 to 13 cm; ashy loam, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; weak very thin platy structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine roots; many very fine pores; slightly acid (pH 6.4); abrupt smooth boundary
AB--13 to 28 cm; ashy loam, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; weak medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and few medium roots; common very fine tubular pores; slightly acid (pH 6.5); clear smooth boundary
BA--28 to 46 cm; gravelly ashy sandy clay loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak medium subangular blocky structure; slightly hard, friable, moderately sticky and slightly plastic; common very fine and few fine roots; common very fine tubular pores; neutral (pH 6.6); clear smooth boundary
Bw--46 to 64 cm; gravelly ashy sandy clay loam, brown (10YR 5/3) and pale brown (10YR 6/3) dry, dark brown (10YR 3/3) moist; weak medium subangular blocky structure; slightly hard, friable, moderately sticky and slightly plastic; common fine and few very fine roots; common very fine tubular pores; neutral (pH 6.6); abrupt wavy boundary
R--64 cm; tuff-breccia containing black, angular basaltic fragments.
TYPE LOCATION: Klamath County, Oregon; about 6 km north of Malin; approximately 870 m north and 975 m east of the SW corner of section 27, T. 40 S., R. 12 E.; USGS Malin 7.5 minute topographic quadrangle; latitude 42.07197 degrees north, longitude 121.3966 degrees west, datum WGS 84 (coordinates determined from GIS).
RANGE IN CHARACTERISTICS:
*Soil temperature regime--mesic
*Mean annual soil temperature--8.0 to 12.0 degrees C; warmer than 5 degrees C between April 1 and October 1
*Moisture control section--10 to 30 cm; dry for at least 90 days between April 1 and October 1; moist in some or all parts for less than 90 consecutive days when the soil temperature is greater than 8 degrees C
*Depth to bedrock--50 to 100 cm
*Mollic epipedon--25 to 50 cm thick
Particle-size control section
*Rock fragment content--5 to 34 percent
*Clay content--18 to 34 percent
Estimated properties, all horizons
*Ammonium oxalate extractable Al plus 1/2 Fe--0.2 to 0.4 percent
*Volcanic glass content--5 to 20 percent
*1/3-bar bulk density--1.0 to 1.35 g/cm3
*1500 kPa water (air-dried samples)--10 to 15 percent
A horizon
*Value--4 or 5 dry, 2 or 3 moist
*Chroma--2 or 3, dry or moist
*Clay content--10 to 20 percent
*Total content of rock fragments--0 to 30 percent
*Combined gravel and cobble content--0 to 30 percent
*Stone content--0 to 3 percent
*Reaction--slightly acid or neutral (pH 6.1 to 7.3)
*Thickness--10 to 20 cm
AB horizon (where present)
*Value--4 or 5 dry, 2 or 3 moist
*Chroma--2 or 3, dry or moist
*Clay content--10 to 20 percent
*Total content of rock fragments--0 to 30 percent
*Combined gravel and cobble content--0 to 30 percent
*Stone content--0 to 3 percent
*Reaction--slightly acid or neutral (pH 6.1 to 7.3)
*Thickness--0 to 25 cm
BA horizon (where present)
*Value--5 or 6, dry
*Chroma--3 or 4, dry or moist
*Fine-earth texture--ashy sandy clay loam, ashy loam, ashy clay loam
*Clay content--18 to 34 percent
*Total content of rock fragments--5 to 34 percent
*Gravel content--5 to 20 percent
*Cobble content--0 to 30 percent
*Reaction--slightly acid or neutral (pH 6.1 to 7.3)
*Thickness--0 to 25 cm
Bw horizon(s)
*Value--5 or 6, dry
*Chroma--3 or 4, dry or moist
*Fine-earth texture--ashy sandy clay loam, ashy loam, ashy clay loam
*Clay content--18 to 34 percent
*Total content of rock fragments--5 to 34 percent
*Gravel content--5 to 20 percent
*Cobble content--0 to 30 percent
*Reaction--slightly acid or neutral (pH 6.1 to 7.3)
*Thickness--15 to 40 cm
COMPETING SERIES:
Buckbert--very deep
Landermeyer--very deep
Redmond--has Bk horizons; occurs at elevations below 1220 m
GEOGRAPHIC SETTING:
Elevation--1250 to 1615 m
Climate--semiarid with cool, moist winters and warm, dry summers
Mean annual air temperature-- 6.9 to 11 degrees C
Mean January air temperature-- -2.8 to -1.7 degrees C
Mean July temperature-- 18.3 to 20.6 degrees C
Mean annual precipitation--254 to 570 mm
Frost-free period--50 to 120 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Calimus--very deep; thick mollic epipedon
Dodes--moderately deep to paralithic contact; argillic horizon
Lorella--clayey-skeletal; shallow to lithic contact; argillic horizon
Stukel--shallow to lithic contact
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--moderately high to high
USE AND VEGETATION:
Use--irrigated agriculture, rangeland
Vegetation--western juniper, basin big sagebrush, bunchgrass
DISTRIBUTION AND EXTENT: Klamath and Shasta Valleys and Basins, Oregon; MLRA 21; moderately extensive.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED:
Klamath County, Oregon, 1977
REMARKS:
Diagnostic horizons and features in this pedon
*Mollic epipedon--A, AB, and BA horizons
*Cambic horizon--Bw horizon
*Lithic contact--upper boundary at 64 cm
*Volcanic glass--A, AB, BA, and Bw horizons
*Particle size control section--zone from 25 to 64 cm
3/22/2022--Updated the soil textures with ashy modifiers and pedon classification to the vitritorrandic subgroup based on lab data from the Stukel soil (KSSL ID: 16N0297); updated formatting.
ADDITIONAL DATA:
NASIS SITE ID--1977OR035005; NASIS PEDON ID--1977OR035005
National Cooperative Soil Survey
U.S.A.