LOCATION DELORO                  AZ

Established Series
Rev. MLR/CCC/PDC
04/2011

DELORO SERIES

The Deloro series consists of shallow, well drained soils that formed in mixed alluvium dominantly from shale, schist, phyllite or sandstone. Deloro soils are on pediments, hills and mountains. Slopes range from 1 to 60 percent. The mean annual precipitation is about 14 inches and the mean annual air temperature is about 62 degrees F.

TAXONOMIC CLASS: Clayey-skeletal, mixed, superactive, thermic, shallow Ustic Haplargids

TYPICAL PEDON: Deloro extremely channery loam - rangeland. (Colors are for dry soil unless otherwise noted.)

A--0 to 2 inches; brown (7.5YR 5/4) extremely channery loam, dark reddish brown (5YR 3/4) moist; moderate fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many fine and very fine roots; many interstitial pores; 65 percent channers; noneffervescent; neutral (pH 7.3); clear wavy boundary. (1 to 4 inches thick)

Bt--2 to 11 inches; reddish brown (5YR 4/3) extremely channery clay, dark reddish brown (5YR 3/4) moist; moderate fine granular structure; hard, friable, moderately sticky and moderately plastic; many very fine roots; many interstitial pores; common faint clay films lining pores and coating channers; 75 percent channers; noneffervescent; neutral (pH 7.2); abrupt wavy boundary. (9 to 16 inches thick)

2Crt--11 to 60 inches; highly fractured, weathered phyllite; dark red (10R 3/6) clay coatings and common very fine roots in fractures.

TYPE LOCATION: Pima County, Arizona; about 1200 feet south and 900 feet west of the northeast corner of section 9, T. 17 S., R. 17 E.

RANGE IN CHARACTERISTICS:

Soil moisture - Intermittently moist in some part of the soil moisture control section during July-September and December-March. Driest during May and June. Ustic aridic soil moisture regime.

Soil temperature - 59 to 69 degrees F.

Depth to bedrock - 10 to 20 inches

Organic matter content - 1 to 3 percent in the surface

Rock fragments - 35 to 85 percent channers or gravel

Reaction - slightly acid to slightly alkaline

A horizon
Hue: 10YR, 7.5YR, 5YR
Value: 3 to 5 dry, 3 or 4 moist
Chroma: 2, 3, or 4, dry or moist

B horizon
Hue: 2.5YR, 5YR
Value: 3, 4, 5, or 6 dry, 3 or 4 moist
Chroma: 2, 3, 4, or 6, dry or moist
Texture: clay loam, clay, sandy clay

COMPETING SERIES: There are no competing series.

GEOGRAPHIC SETTING: Deloro soils are on pediments, hills and mountains. Slopes range from 1 to 60 percent. Deloro soils formed in alluvium from schist, quartzite, shale, phyllite or sandstone. Elevations range from 2,900 to 5,720 feet. The mean annual precipitation is 12 to 16 inches. The mean annual air temperature is 57 to 67 degrees F. The frost-free period is about 180 to 240 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Andrada, Chiricahua, Mabray, Oracle, and Schrap soils. Andrada soils do not have argillic horizons and have a calcic horizon. Mabray soils are carbonatic and have a lithic contact. Schrap soils do not have argillic horizons. Chiricahua soils are clayey. Oracle soils are loamy.

DRAINAGE AND PERMEABILITY: Well drained; rapid runoff; slow permeability.

USE AND VEGETATION: These soils are used for livestock grazing. Vegetation is ocotillo, yucca, catclaw, agave, pricklypear, cholla, shrubby buckwheat, slender grama, tobosa, black grama, sideoats grama, hairy grama, wolftail, curlymesquite, false-mesquite, plains lovegrass, and threeawn.

DISTRIBUTION AND EXTENT: Southern Arizona. These soils are moderately extensive. MLRA is 41.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona

SERIES ESTABLISHED: Pinal County, Arizona; Soil survey of Pima County, Arizona, Eastern Part; 1986.

REMARKS: Diagnostic horizons and features recognized in this pedon are:

Ochric epipedon - the zone from 0 to 2 inches (A horizon)

Argillic horizon - the zone from 2 to 11 inches (Bt horizon)

Paralithic contact - the boundary at 11 inches (2Crt)

Classified according to Soil Taxonomy, Second Edition, 1999; Keys to Soil Taxonomy, Eleventh Edition, 2010

Revised for the correlation of AZ661, 12/2008, WWJ

Revised for the correlation of Graham County, AZ, Southwestern Part; March, 2011, WWJ

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National Cooperative Soil Survey
U.S.A.