LOCATION JODERO CO+UT WYEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Cumulic Haplustolls
TYPICAL PEDON: Jodero loam - grassland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 8 inches; brown (10YR 5/3) loam, dark brown (10YR 3/3) moist; strong medium granular structure; soft, very friable; 5 percent pebbles; mildly alkaline (pH 7.6); gradual wavy boundary. (5 to 10 inches thick)
A2--8 to 24 inches; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; moderate coarse subangular blocky structure parting to moderate medium granular; slightly hard, very friable; peds are hard; 5 percent pebbles; mildly alkaline (pH 7.6); clear wavy boundary. (10 to 35 inches thick)
A3--24 to 60 inches; grayish brown (10YR 5/2) loam stratified with thin lenses of fine sandy loam, brown (10YR 3/2) moist; moderate coarse subangular blocky structure; slightly hard, very friable; peds are very hard; few thin glossy patches on some faces of peds and in root channels; strongly effervescent; moderately alkaline (pH 8.2); gradual wavy boundary. (25 to 40 inches thick)
C--60 to 70 inches; light brownish gray (10YR 6/2) loam stratified with thin lenses of fine sandy loam, few medium distinct (10YR 5/6) mottles; dark grayish brown (10YR 4/2) moist; massive; hard, friable; 5 percent pebbles; strongly effervescent; moderately alkaline (pH 8.2).
TYPE LOCATION: Rio Grande County, Colorado; SW1/4 of Sec. 34, T. 39 N., R. 6 E.
RANGE IN CHARACTERISTICS: Mean annual soil temperature is 42 to 47 degrees F and mean summer soil temperature is 60 to 62 degrees F. The soils range from slightly acid to moderately alkaline in a majority of subhorizons in the particle size control section. The mollic epipedon ranges from 40 to more than 60 inches thick. Depth to uniformly calcareous material ranges from 10 to 40 inches or more, but some pedons may be calcareous to the surface. The particle size control section averages 15 to 35 percent fine and coarser sand and 0 to 15 percent rock fragments (mainly 1/2 to 10 inches in diameter). Some pedons have sandy-skeletal materials below 40 inches.
The A horizon has hue of 5Y through 7.5YR, value of 4 or 5, 2 or 3 moist, and chroma of 1 through 3.
The C or 2C horizon has hue of 5Y through 7.5YR, value of 4 through 6, 2 through 5 moist, and chroma of 2 or 3 in the matrix. Textures are loam, clay loam, or stratified sandy clay loam. Mottling is distinct in the lower part of the C horizon with chroma greater than 2.
COMPETING SERIES: These are the Brycan, Cordeston, Enbar, Frolic, McGaffey, Nutrioso, and Straw series. Brycan soils have a cambic horizon. Cordeston soils have carbonate at depths of 60 inches or more. Enbar soils have mottles in the upper part of the particle size control section. Frolic soils have mottles in the lower part of the particle size control section. McGaffey soils have hue of 5YR or redder in more than half the profile. Nutrioso soils have mollic epipedons 16 to 20 inches thick. Straw soils are calcareous throughout and have mollic epipedons of 16 to 40 inches thick.
GEOGRAPHIC SETTING: Jodero soils are on stream terraces, concave drainageways, and the concave portions of alluvial fans. Slopes range from 0 to 12 percent. These soils formed in thick, calcareous alluvium derived primarily from rhyolite, andesite,
gneiss, and trachite. The average annual precipitation is 12 inches with peak periods of precipitation during the spring and summer months. Mean annual temperature is 40 to 47 degrees F, and mean summer temperature is 59 to 61 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Shawa and Villa Grove soils. Shawa soils have chroma of less than 1.5 in the upper part of the mollic epipedon. Villa Grove soils have an argillic horizon.
DRAINAGE AND PERMEABILITY: Well-drained; medium runoff; moderate permeability.
USE AND VEGETATION: These soils are used principally as native pastureland. Principal native plants are rabbitbrush, blue grama, western wheatgrass, and snakeweed.
DISTRIBUTION AND EXTENT: San Luis Valley Area of south-central Colorado. The series is of small extent.
MLRA OFFICE RESPONSIBLE: Lakewood, Colorado
SERIES ESTABLISHED: Rio Grande County Area, Colorado, 1972.