LOCATION UZANEVA AZ+NMEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Haplic Natrargids
TYPICAL PEDON: Uzaneva clay loam -- on a nearly level flood plain at 5,100 feet elevation - rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 1 inch; reddish brown (2.5YR 5/4) clay loam, reddish brown (2.5YR 4/4) moist; strong thick platy structure parting to moderate very fine granular; soft, very friable, sticky and plastic; few fine and very fine roots; few very fine vesicular pores; strongly effervescent; moderately alkaline (pH 8.2); clear smooth boundary. (1 to 3 inches thick)
Bt1--1 to 3 inches; reddish brown (2.5YR 5/4) clay, reddish brown (2.5YR 5/4) moist; moderate medium prismatic structure parting to weak medium platy; hard, friable, very sticky and plastic; few fine and very fine roots; few very fine tubular pores; common thin cracks 2 to 10 mm wide filled with yellowish red loamy fine sand; few faint clay films on faces of peds and lining pores; slightly effervescent; strongly alkaline (pH 8.8); clear smooth boundary.
Bt2--3 to 13 inches; reddish brown (2.5YR 5/4) clay, reddish brown (2.5YR 4/4) moist; moderate medium prismatic structure parting to strong medium subangular blocky; very hard, firm, very sticky and very plastic; few medium and fine, and common very fine roots; few very fine tubular pores; common thin cracks 2 to 10 mm wide filled with yellowish red loamy fine sand; few distinct clay films on faces of peds and common faint on faces of peds and lining pores; strongly effervescent; strongly alkaline (pH 9.0); clear wavy boundary. (Combined thickness of the Bt horizons is 8 to 20 inches)
Btn--13 to 25 inches; light reddish brown (2.5YR 6/4) silty clay loam, reddish brown (2.5YR 5/4) moist; weak medium prismatic structure parting to moderate medium subangular blocky; hard, friable, sticky and plastic; few fine and common very fine roots; few fine and very fine tubular pores; few lamina of fine sandy loam and silt loam; few thin cracks 1 to 5 mm wide filled with reddish brown clay; common faint clay films on faces of peds and lining pores; strongly effervescent; strongly alkaline (pH 9.0); abrupt wavy boundary. (8 to 15 inches thick)
C/Btny--25 to 39 inches; light reddish brown (5YR 6/3) and reddish brown (2.5YR 5/4) silty clay loam, reddish brown (5YR 5/3) and reddish brown (2.5YR 4/4) moist; massive; hard, friable, sticky and plastic; few fine and very fine roots; few fine and very fine tubular pores; few lamina of fine sandy loam and silt loam; few thin cracks 0.5 to 2 mm wide; few faint clay films lining cracks; secondary silt-sized gypsum crystals segregated in very few fine filaments; strongly effervescent; strongly alkaline (pH 9.0); gradual smooth boundary. (0 to 15 inches thick)
Cn1--39 to 62 inches; light reddish brown (5YR 6/4) silty clay loam, reddish brown (5YR 4/4) moist; massive; hard, friable, sticky and plastic; few fine and very fine roots; common very fine tubular pores; few thin strata of very fine sandy loam; strongly effervescent; strongly alkaline (pH 9.0); clear smooth boundary.
Cn2--62 to 70 inches; reddish brown (2.5YR 5/4) silty clay, reddish brown (2.5YR 4/4) moist; massive; very hard, firm, very sticky and very plastic; few fine and very fine roots; few very fine tubular pores; few thin strata of sandy clay loam; strongly effervescent; strongly alkaline (pH 9.0); clear smooth boundary.
Cn3--70 to 80 inches; light reddish brown (5YR 6/4) silty clay loam, reddish brown (5YR 4/4) moist; massive; hard, friable, sticky and plastic; few fine and very fine roots; few very fine tubular pores; few lenses of very fine sandy loam; strongly effervescent; strongly alkaline (pH 9.0). (Combined thickness of the C horizons is 7 to 33 inches)
TYPE LOCATION: Apache County, Arizona; about 9 miles south of Rock Point; 500 feet south and 250 feet west of the northeast corner of section 26, T.37 N., R.25 E.; Latitude 36 degrees 35 minutes 28 seconds N and Longitude 109 degrees 36 minutes 21 seconds W.
RANGE IN CHARACTERISTICS:
Soil moisture - The soil moisture control section is intermittently moist in some part from July to October and December to April. Assumed to be dry in all parts greater than 75 percent of the time (cumulative) when the soil temperature at 20 inches is 41 degrees F. or higher. Driest during May and June. Typic aridic soil moisture regime.
Soil temperature - 54 to 58 degrees F.
Silicate clay content, control section weighted average - 35 to 55 percent
Rock fragments, control section weighted average - less than 5 percent gravel
Depth to base of Natric horizon - 11 to 25 inches
Reaction - ranges from moderately alkaline in the surface to strongly alkaline in the subsoil and substratum
A horizon
Hue: 2.5YR, 5YR
SAR: 0 to 5
Bt1 and Bt2 horizons
Hue: 2.5YR, 5YR
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 3 or 4, dry or moist
Texture: clay, clay loam
Salinity, dS/m: 0 to 2
SAR: 5 to 13
Btn horizon
Hue: 2.5YR, 5YR
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 3 or 4, dry or moist
Texture: silty clay loam, silty clay, clay
Salinity, dS/m: 2 to 4
SAR: 13 to 30
Gypsum content: 0 to 2 percent
C horizons
Hue: 2.5YR through 10YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 2 through 4, dry or moist
Texture: stratified sandy loam to silty clay
Salinity, dS/m: 2 to 4
Sodicity, SAR: 13 to 30
Gypsum content: 0 to 2 percent
Other features: some pedons have thin subhorizons with hue of 2.5Y
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Uzaneva soils are on flood plains. They formed in alluvium derived from Triassic and Jurassic shale, siltstone, and sandstone. Minor additions of eolian material derived from sandstone are present in the upper horizons. Slopes are 0 to 2 percent. Elevation ranges from 4,700 to 5,200 feet. The mean annual precipitation is 5 to 8 inches with 35 to 60 percent falling as rain from high-intensity thunderstorms between July and September. The mean annual air temperature is 52 to 56 degrees F. The frost-free period is 140 to 170 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Gotho, Shumbegay, and Escavada soils. Gotho soils are fine-loamy, do not have high shrink-swell properties, and occur on adjacent hummocks. Shumbegay soils are sandy, do not have natric horizons, and occur on adjacent stable dunes. Escavada soils are sandy and nonsodic.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; very slow permeability. Rare flooding.
USE AND VEGETATION: Uzaneva soils are used for livestock grazing and marginal irrigated cropland. Present vegetation is mound saltbush, alkali sacaton, galleta, bottlebrush squirreltail, Torrey seapweed, and scattered black greasewood. Irrigated crops are alfalfa, corn, and grasses and legumes for pasture.
DISTRIBUTION AND EXTENT: Uzaneva soils are of small extent on the Tyende Saddle (Chinle Valley) portion of the Colorado Plateau province in northeast Arizona. MLRA is 35. More acres of this soil exist in the Chinle Valley south of the Shiprock Soil Survey Area.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Apache County, Arizona; Soil survey of the Shiprock Area; 1993.
REMARKS: This series was proposed by New Mexico. Arizona retains responsibility.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from 0 to 1 inch (A horizon)
Natric horizon - The zone from 1 to 25 inches (Bt1, Bt2, Btn horizons)
Haplic subgroup - The presence of a natric horizon with a sodium adsorption ratio that is less than 13 in 50 percent or more of the horizon thickness. (Bt1 and Bt2 = 12 inches total with SAR <13; Btn = 12 inches with SAR >13)
This soil has high shrink-swell properties in the natric horizon and morphological features that are marginal to those required for the Vertic subgroup of Natrargids. Cracks are present in the natric horizon that are generally 5 mm or more wide, but slickensides or wedge-shaped aggregates are not present. This soil may qualify for the Vertic subgroup under the linear extensibility (LE) criteria, but it has not had the COLE determined for the horizons above 40 inches.
Classified according to Soil Taxonomy Second Edition, 1999; Keys to Soil Taxonomy Tenth Edition, 2006.
ADDITIONAL DATA: Sodium adsorption ratio values were determined for the horizons between 1 and 39 inches for the series type location by Inter-Mountain Laboratories, Inc., Farmington, NM. Salinity values were determined with an Instant EC salinity kit.