LOCATION ODERMOTT IDEstablished Series
TAXONOMIC CLASS: Clayey over sandy or sandy-skeletal, smectitic, mesic Typic Argixerolls
TYPICAL PEDON: Odermott loam - grass. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 8 inches; dark grayish brown (10YR 4/2) loam, very dark brown (10YR 2/2) moist; moderate fine granular structure; upper part may be moderate medium and thick platy; slightly hard, friable, slightly sticky and slightly plastic; many fine roots; many very fine pores; slightly acid (pH 6.4); abrupt smooth boundary. (6 to 14 inches thick)
Bt1--8 to 20 inches; brown (7.5YR 4/3) light sandy clay, dark brown (7.5YR 3/3) moist; weak to moderate medium prismatic and moderate medium angular and subangular blocky structure; extremely hard, firm, very sticky and very plastic; few fine roots; common very fine pores; continuous moderately thick clay films on peds; slightly acid (pH 6.4); clear wavy boundary. (6 to 12 inches thick)
Bt2--20 to 26 inches; similar to Bt1 except; dark reddish brown (5YR 4/3) moderate to strong medium prismatic and angular blocky structure; continuous thick clay films on peds; abrupt smooth boundary. (6 to 15 inches thick)
Bt3--26 to 32 inches; similar to Bt2 except coarse sandy clay loam. (0 to 8 inches thick)
2C--32 to 60 inches; brown (10YR 5/3) stratified loamy sand and sand, dark brown (7.5YR 4/3) moist; massive or single grain; very friable, loose; slightly acid (pH 6.2).
TYPE LOCATION: Gem County, Idaho; about 3 miles southwest of Ola; 940 feet south and 520 feet west of the northeast corner of section 2, T.9N., R.1E.
RANGE IN CHARACTERISTICS:
Soil moisture - usually moist, but are dry for 60 to 80 consecutive days between depths of 4 and 12 inches during late summer
Average annual soil temperature - 47 to 52 degrees F.
Average summer soil temperature - 65 to 70 degrees F.
Mollic epipedon thickness - 8 to 20 inches, below 20 inches less than 1 percent organic matter
Rock fragments - 0 to 30 percent
Clay in control section - 35 to 60 percent
Depth to contrasting sandy or sandy-skeletal horizons - 24 to 40 inches Rock fragments, sandy or sandy-skeletal - 0 to 90 percent
Reaction - neutral to slightly acid
A horizon
Hue - 10YR or 7.5YR
Value - 3 or 4 dry, 2 or 3 moist
Chroma - 1 or 2 dry or moist
Organic matter - 2 to 5 percent
Bt horizon
Hue - 7.5YR or 5YR
Value - 3 or 4 dry, 3 or 4 moist
Chroma - 3 through 6 dry, 2 through 4 moist
Textures - SCL, CL, SC, C
COMPETING SERIES: There are no other series in the family. Other similar soils are Brownlee, Denison, Haw, Montour, Tunitas, and Van Dusen series. The Brownlee series has a moderately fine to medium textured Bt horizon. Denison and Tunitas series have mottles in the lower part of the profile. Haw, Montour, and Van Dusen series have calcareous horizons.
GEOGRAPHIC SETTING: Odermott soils are on gently sloping or undulating to steep dissected high terraces at elevations of 2,700 to 4,400 feet. Slopes are 3 to 60 percent. Soils formed in old mixed sediments dominated by acid igneous rock sources. The climate is subhumid continental. The average frost-free period is 100 to 140 days; and the average annual precipitation is 16 to 23 inches, including 4 to 6 feet of snowfall. The average annual air temperature is 45 to 50 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are Appledellia, Brownlee, Gem, Montour, and Van Dusen series. Appledellia series have a duripan over pebbles at depths of 20 to 40 inches. Gem series have basalt bedrock at depths of 20 to 40 inches.
DRAINAGE AND PERMEABILITY: Well drained, medium to very rapid runoff; moderately slow permeability of the Bt and very rapid for the underlying sands and pebbles.
USE AND VEGETATION: Used mainly for range; also for dryland and irrigated grain hay and pasture; one area irrigated apple orchard. The natural vegetation is bluebunch wheatgrass, Idaho fescue, bluegrass, related forbs, some antelope bitterbrush and Xericensis big sagebrush.
DISTRIBUTION AND EXTENT: Southwestern and central Idaho. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Gem County, Idaho, 1962.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface to 20 inches (Ap and Bt1 horizons)
Argillic horizon - clay 35 to 60 percent (Bt2 and Bt3 horizons)
Clay- dominant clay montmorillonite
Strongly contrasting particle-size class - sand or sand and pebbles at 24 to 40 inches
Moisture regime - xeric