LOCATION DUSTY AZ
Established Series
WJ/PDC/RKS/HCD
04/2015
DUSTY SERIES
The Dusty series consists of very deep, well drained soils that formed in mixed alluvium on basin floors. Slopes range from 0 to 6 percent. Mean annual precipitation is about 10 inches and the mean annual air temperature is about 65 degrees.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Typic Natrargids
TYPICAL PEDON: Dusty sandy loam - rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 2 inches; yellowish brown (10YR 5/4) sandy loam, dark yellowish brown (10YR 4/4) moist; weak thin platy structure; slightly hard, very friable, nonsticky and slightly plastic; common very fine roots; many fine and medium irregular pores; 1 percent fine gravel; slightly effervescent, 2 percent calcium carbonate equivalent; moderately alkaline (pH 8.0); abrupt smooth boundary. (1 to 3 inches thick)
Bt--2 to 4 inches; brown (7.5YR 5/4) loam, dark yellowish brown (10YR 4/4) moist; moderate very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine roots; common very fine and fine tubular pores; few faint clay films on ped faces and in pores; 1 percent fine gravel; slightly effervescent, 3 percent calcium carbonate equivalent; moderately alkaline (pH 8.2); clear wavy boundary. (1 to 8 inches thick)
Btkn--4 to 20 inches; brown (7.5YR 5/4) clay loam with discontinuous areas of coarser textures, yellowish brown (10YR 5/4) moist; moderate fine and medium prismatic structure parting to strong medium angular blocky; very hard, firm, sticky and plastic; few very fine roots; common very fine and fine tubular pores; few faint clay films on ped faces and in pores; 1 percent fine gravel; violently effervescent, many coarse soft calcium carbonate masses, 16 percent calcium carbonate equivalent; strongly alkaline (pH 9.0); clear wavy boundary. (10 to 21 inches thick)
Bk1--20 to 35 inches; pale brown (10YR 6/3) sandy clay loam, yellowish brown (10YR 5/4) moist; moderate thin platy structure parting to moderate very fine subangular blocky; hard, firm, slightly sticky and slightly plastic; few very fine roots; many fine and medium tubular pores; 1 percent fine gravel; slightly saline (ECe 6 dS/m); violently effervescent, few fine soft masses of calcium carbonate, 16 percent calcium carbonate equivalent; moderately alkaline (pH 8.0); clear wavy boundary. (9 to 20 inches thick)
Bk2--35 to 60 inches; pale brown (10YR 6/3) loam, yellowish brown (10YR 5/4) moist; massive; very hard with occasional areas that are hard, friable, slightly sticky and slightly plastic; few very fine roots; many fine and medium tubular pores; 1 percent fine gravel; slightly saline (ECe 5 dS/m); violently effervescent, 19 percent calcium carbonate equivalent; moderately alkaline (pH 8.4).
TYPE LOCATION: Mohave County, Arizona; located at a latitude of 35 degrees, 38 minutes, 07 seconds North and longitude of 113 degrees, 57 minutes, 21 seconds West; about 600 feet West and 800 feet North of the Southeast corner of section 14, T. 26 N., R. 16 W. Gila and Salt River Base Meridian.
RANGE IN CHARACTERISTICS:
Soil moisture - Intermittently moist in some part of the soil moisture control section during December - February and for less than 20 days cumulative during July - September. Driest during May and June. Typic Aridic soil moisture regime.
Soil temperature: 59 to 72 degrees F.
Rock fragments: less than 15 percent
Organic matter: less than 1 percent
Depth to calcic horizon: 3 to 12 inches
A horizon
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Bt horizon
Hue: 7.5YR, 10YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Texture: sandy clay loam or loam; discontinuous strata of coarser material
Electrical conductivity: less than 2 dS/m
Btkn horizon
Hue: 7.5YR, 10YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Textures: loam, clay loam
Electrical conductivity: 0 to 8 dS/m
Reaction: strongly or very strongly alkaline
Sodium Adsorption Ratio: assumed to be greater than 13
Bk horizons
Hue: 7.5YR, 10YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Textures: loam, sandy clay loam, clay loam
Electrical conductivity: 2 to 8 dS/m
COMPETING SERIES: These are the
Casaga (NV),
Corum (CA)(T),
Garces (CA),
Leuhman (CA),
Norob (CA),
Tipnat (NV) and
Polvadero (CA) series. Casaga soils contain gypsum. Corum soils are moderately deep to a paralithic contact. Garces and Norob soils do not have a calcic horizon. Leuhman and Polvadero soils are dry in the summer and moist in the winter. Tipnat soils are drier in the soil moisture control section due to a lower rainfall component.
GEOGRAPHIC SETTING: Dusty soils are on basin floors at elevations of 2,700 to 3,400 feet. Slopes range from 0 to 6 percent. These soils formed in alluvium from mixed sources. The mean annual precipitation is 9 to 12 inches. The mean annual air temperature is 57 to 70 degrees. The frost-free period is 200 to 280 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Lostman,
Antares and
Cod soils. None of these soils have a natric horizon.
DRAINAGE AND PERMEABILITY: Well drained; very low runoff; very slow permeability.
USE AND VEGETATION: Used for livestock grazing. Vegetation includes shadscale, alkali sacaton, big galleta, fluff grass, fourwing saltbush and winterfat.
DISTRIBUTION AND EXTENT: Northwestern Arizona. Dusty soils are of moderate extent. MLRA is 30.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: PHOENIX, ARIZONA
SERIES ESTABLISHED: Mohave County, Arizona; Soil Survey of Mohave County, Arizona, Central Part; 2005.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from 0 to 2 inches (A horizon)
Natric horizon - The zone from 4 to 20 inches (Btkn horizon)
Calcic horizon - The zone from 4 to 35 inches (Btk and Bk1 horizons)
Classified according to Keys to Soil Taxonomy Ninth Edition, 2003.
Responsibility for this series was transferred from Davis to Phoenix 4/2015. The last revision to the series was 1/2005. ET
National Cooperative Soil Survey
U.S.A.