LOCATION HOEHNE COEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, nonacid, mesic Ustic Torrifluvents
TYPICAL PEDON: Hoehne fine sandy loam, on an east-facing nearly level slope of 1 percent under grass and trees. (Colors are for dry soil unless otherwise noted).
A--0 to 3 inches (0 to 8 cm); grayish brown (10YR 5/2) fine sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine and medium granular structure; slightly hard, very friable, nonsticky and nonplastic; slightly alkaline (pH 7.6); gradual smooth boundary. (2 to 6 inches).
C1--3 to 14 inches (8 to 35 cm); brown (10YR 5/3) loamy fine sand, brown (10YR 4/3) moist; massive; soft, loose, nonsticky and nonplastic; slightly alkaline (pH 7.4); abrupt smooth boundary. (6 to 10 inches)
C2--14 to 34 inches (35 to 86 cm); brown (10YR 5/3) fine sandy loam, brown (10YR 4/3) moist; massive; soft, very friable, nonsticky and nonplastic; slightly alkaline (pH 7.6); clear smooth boundary. (15 to 25 inches)
C3--34 to 44 inches (86 to 112 cm); brown (10YR 5/3) fine sandy loam, brown (10YR 4/3) moist; few faint yellowish brown (10YR 5/6) concentrations; massive; slightly hard, very friable, nonsticky and nonplastic; common bands of sand and loam material; slightly alkaline (pH 7.6); clear smooth boundary. (10 to 19 inches).
C4--44 to 60 inches (112 to 152 cm); grayish brown (10YR 5/2) loamy sand, brown (10YR 4/3) moist; single grain; loose, nonsticky and nonplastic; slightly alkaline (pH 7.4).
TYPE LOCATION: Las Animas County, Colorado; about .2 miles west of Trinidad and .1 mile west of I-25 along the north side of the Purgatoire River; 500 feet north and 200 feet east of the southwest corner of section 13, T. 33., R. 64 W. Latitude 37 degrees, 9 minutes, 56 seconds north, Longitude 104 degrees, 30 minutes, 53 seconds west NAD1983.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature: 50 to 54 degrees F.
Mean summer temperature: 65 to 74 degrees F.
Depth to secondary carbonates: 40 inches or more
Depth to bedrock: 60 inches or more
The estimated organic carbon content of the surface ranges from .6 to 2.0 percent and decreases irregularly with depth.
Particle-size control section:
Clay content: 5 to 18 percent
Silt content: 5 to 40 percent
Sand content: 50 to 75 percent, with more than 35 percent fine or coarser sand.
Coarse fragments: 0 to 15 percent but are commonly less than 5 percent.
A horizon:
Hue: 2.5Y to 7.5YR
Value: 4 to 6 dry, 3 to 5 moist
Chroma: 2 or 3
Reaction: neutral or mildly alkaline (pH 6.6 to 7.8).
C horizon:
Hue: 2.5Y to 7.5YR
Value: 5 to 7 dry, 4 to 6 moist
Chroma: 2 or 3
Redoximorphic concentrations are common with increasing depth
Texture: highly stratified fine sandy loam, loamy fine sand, loamy sand, and sandy loam
Reaction: neutral or mildly alkaline (pH 6.6 to 7.8).
COMPETING SERIES:This is the
Cordes(AZ) series.
Cordes soils: have mollic colors to depths of 20 inches or more.
GEOGRAPHIC SETTING:
Landform: terraces and flood plains.
Slopes: 0 to 2 percent but may range to 6 percent
Parent material: alluvium derived from sedimentary rock
Average annual precipitation: 13 to 16 inches
Mean annual air temperature: 48 to 54 degrees F.
Elevation ranges from 5500 to 6300 feet
Frost free season: 120 to 160 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Haversid and Mauricanyon series. Haversid soils are calcareous throughout the control section and are in the fine-loamy family. Mauricanyon soils have a mollic epipedon.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; slow runoff; rapid or moderately rapid permeability.
USE AND VEGETATION: These soils are used as pastureland, irrigated cropland and irrigated hayland. Native vegetation is mainly bluestems, Indian ricegrass, blue grama, plains cottonwood and willows.
DISTRIBUTION AND EXTENT: Southeastern Colorado. LRR G, MLRA 69; The soils of this series are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Las Animas County, Colorado, 2007.
REMARKS:
Particle size control section: 10 to 40 inches. (A, C1, C2 and part of the C3 horizons)
Ochric epipedon: 0 to 3 inches. (A horizon)
Fluventic features: irregular decrease in organic matter.
Aridic moisture regime bordering on ustic.
Remarks: Name is taken from a small town near the Purgatoire River in Las Animas County, Colorado. Last updated by the state 12/89.
The assignment of the cation-exchange activity class is inferred from lab data from similar soils in the surrounding area. WAW/LAN 4/2006 Added moderately rapid permeability.
Taxonomic Version: Keys to Soil Taxonomy Tenth Edition 2006.