LOCATION UZONA AZ+COEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Typic Haplosalids
TYPICAL PEDON: Uzona loam in rangeland. (Colors are for dry soil unless otherwise noted.)
An--0 to 1 inch; light yellowish brown (10YR 6/4) loam, yellowish brown (10YR 5/4) moist; moderate thick platy structure over strong fine granular; slightly hard, friable, moderately sticky and moderately plastic; few very fine roots; many fine vesicular pores below a 0.5 cm surface crust; electrical conductivity is 13; sodium adsorption ratio is 32; strongly effervescent; slightly alkaline; abrupt smooth boundary. (1 to 3 inches thick)
BAn--1 to 5 inches; yellowish brown (10YR 5/4) clay loam, dark yellowish brown (10YR 4/4) moist; moderate medium prismatic structure parting to moderate fine subangular blocky; hard, firm, moderately sticky and moderately plastic; common fine roots; common very fine tubular pores; electrical conductivity is 22; sodium adsorption ratio is 120; violently effervescent; moderately alkaline; clear smooth boundary. (2 to 7 inches thick)
Btzn1--5 to 14 inches; yellowish brown (10YR 5/4) clay, dark yellowish brown (10YR 4/4) moist; moderate coarse prismatic structure; very hard, very firm, very sticky and very plastic; many fine roots; common very fine tubular pores; few faint clay films in pores; salt coats on some ped faces; electrical conductivity is 93; sodium adsorption ratio is 237; violently effervescent; strongly alkaline; clear smooth boundary. (5 to 15 inches thick)
Btzn2--14 to 32 inches; light brown (7.5YR 6/4) clay, dark yellowish brown (10YR 4/4) moist; weak coarse prismatic structure; very hard, very firm, very sticky and very plastic; few very fine roots; few very fine tubular pores; salt coatings on exposed surfaces; few faint clay films in pores; electrical conductivity is 92; sodium adsorption ratio is 310; violently effervescent; strongly alkaline; clear smooth boundary. (10 to 30 inches thick)
2Bzn1--32 to 45 inches; light yellowish brown (10YR 6/4) sandy clay, dark yellowish brown (10YR 4/4) moist; massive; very hard, firm, moderately sticky and moderately plastic; few very fine roots; few very fine tubular pores; salt coatings on exposed surfaces; electrical conductivity is 50; sodium adsorption ratio is 382; violently effervescent; strongly alkaline; clear smooth boundary. (5 to 15 inches thick)
2Bzn2--45 to 58 inches; light yellowish brown (10YR 6/4) sandy clay loam, yellowish brown (10YR 5/4) moist; massive; hard, friable, slightly sticky and slightly plastic; few fine roots; violently effervescent; very strongly alkaline; abrupt smooth boundary. (10 to 20 inches thick)
3Bzn3--58 to 60 inches; very pale brown (10YR 7/3) fine sand, light yellowish brown (10YR 6/4) moist; single grain; loose, loose, nonsticky and nonplastic; violently effervescent; very strongly alkaline.
TYPE LOCATION: Navajo County, Arizona; Hopi Reservation; about 600 feet east of Little Burro Springs; located about 1,000 feet east and 1,000 feet south of the northwest corner of sec. 7, T. 26 N., R. 17 E.
RANGE IN CHARACTERISTICS:
Soil moisture regime: Typic aridic
Soil temperature regime: mesic
Mean annual soil temperature: 52 to 59 degrees F
Particle-size control section: 35 to 60 percent clay
Depth to secondary calcium carbonate: less than 20 inches
Depth to the base of the natric horizon: 18 to 55 inches
A horizon
Hue: 5YR to 10YR
Value: 5 to 7 (3 to 6 moist)
Chroma: 3 or 4
Texture: loam or clay loam
Rock fragments: 0 to 35 percent
Calcium carbonate equivalent: 1 to 5 percent
EC (mmhos/cm): 1 to 16
SAR: 0 to 50
Reaction: slightly to very strongly alkaline
B horizon
Hue: 5YR to 10YR
Value: 4 to 6 (3 to 5 moist)
Chroma: 3 or 4
Texture: clay loam or clay
Rock fragments: 0 to 35 percent
Calcium carbonate equivalent: 1 to 15 percent
EC (dS/m): 1 to 16 or more above 16 inches; mixed salts are 0.15 percent to more than 0.65 percent above 26 inches.
SAR: 13 to 450
Reaction: slightly to very strongly alkaline
C horizon
Hue: 5YR to 10YR
Value: 5 to 7 (4 to 6 moist)
Chroma: 3 or 4
Texture: sandy clay loam, clay loam, or sandy clay
and fine sand or loamy fine sand in the lower part
Rock fragments: 0 to 35 percent
Calcium carbonate equivalent: 1 to 15 percent
Reaction: slightly to very strongly alkaline
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Parent material: stream and slope alluvium derived from shale and sandstone
Landform: stream terraces, fans, and hills
Slopes: 0 to 12 percent
Elevation: 5,000 to 6,000 feet
Mean annual temperature: 52 to 57 degrees F
Mean annual precipitation: 6 to 11 inches
Frost-free period: 130 to 160 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Polacca and Wepo soils on stream terraces. Both soils have cambic horizons, also Polacca soils are fine-loamy over sandy or sandy-skeletal.
DRAINAGE AND PERMEABILITY: Well drained, medium to very high runoff, very slow or slow permeability
A seasonal high water table occurs below 60 inches in some pedons.
USE AND VEGETATION: These soils are used mainly for livestock grazing. Vegetation is alkali sacaton, galleta, western wheatgrass, fourwing saltbush, shadscale, saline wildrye, bottlebrush squirreltail and Indian ricegrass.
DISTRIBUTION AND EXTENT: Northern Arizona and southwest Colorado. LRR D, MLRA 35. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Hopi Area, Arizona, Parts of Coconino and Navajo Counties; 1985.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: The zone from 0 to 1 inch. (An)
Argillic horizon: The zone from 5 to 32 inches. (Btzn1, Btzn2)
Natric horizon: The zone from 5 to 32 inches. (Btzn1, Btzn2)
Water table: The presence of an apparent water table below 60 inches occurs in some pedons.
Particle size control section: The zone from 5 to 25 inches. (Btzn1, Btzn2)
Classified according to Soil Taxonomy Second Edition, 1999; Keys to Soil Taxonomy Tenth Edition, 2006.
ADDITIONAL DATA: Lab Data by BIA, Gallup, NM.