LOCATION REDUN AZEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, hyperthermic Sodic Haplocambids
TYPICAL PEDON: Redun fine sandy loam - rangeland. (Colors are for dry soil unless otherwise noted).
Anz--0 to 6 inches; light yellowish brown (10YR 6/4) fine sandy loam, dark yellowish brown (10YR 4/4) moist; weak very fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine roots; few fine vesicular pores; noneffervescent; slightly saline (ECe 7dS/m) and strongly sodic (SAR 50); moderately alkaline (pH 8.2); clear smooth boundary. (1 to 6 inches thick)
Bwn--6 to 12 inches; strong brown (7.5YR 5/6) sandy loam, brown (7.5YR 4/4) moist; moderate fine subangular blocky structure; slightly hard, very friable, slightly sticky and nonplastic; common very fine, few fine and medium roots; few very fine vesicular pores; few fine, rounded, soft accumulations of lime and salt; violently effervescent; strongly saline (ECe 40 dS/m) and strongly sodic (SAR 85); moderately alkaline (pH 8.4); gradual wavy boundary. (9 to 14 inches thick)
Bnzl--12 to 24 inches; strong brown (7.5YR 5/6) sandy loam, brown (7.5YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine roots; few very fine and common fine vesicular pores; few coarse, rounded, soft accumulations of lime and salt; violently effervescent; strongly saline (ECe 35 dS/m) and strongly sodic (SAR 132); strongly alkaline (pH 8.6); gradual wavy boundary. (5 to 22 inches thick)
Bnz2--24 to 42 inches; strong brown (7.5YR 5/6) sandy loam, brown (7.5YR 5/4) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; few medium roots; common very fine vesicular pores; few fine, irregular, soft accumulations of lime and salt; violently effervescent; strongly saline (ECe 30 dS/m) and strongly sodic (SAR 84); strongly alkaline (pH 8.6); gradual irregular boundary. (0 to 18 inches thick)
Bknz--42 to 60 inches; reddish yellow (7.5YR 6/6) fine sandy loam, strong brown (7.5YR 5/6) moist; weak medium subangular blocky structure; slightly hard, firm, nonsticky and nonplastic; few very fine pores; many medium, irregular, soft accumulations of lime and salt; violently effervescent; strongly saline (ECe 44 dS/m) and strongly sodic (SAR 96); strongly alkaline (pH 8.6).
TYPE LOCATION: Pinal County, Arizona; about 5 miles north of Maricopa, on the Gila River Indian Reservation; 2600 feet north and 1300 feet east of the southwest corner of Section 34, T. 3 S., R. 3 E.
RANGE IN CHARACTERISTICS:
Soil Moisture: Usually dry, intermittently moist in some part of the soil moisture control section during July - September and December - February. Driest during May and June. Typic aridic moisture regime.
Rock Fragments: 0 to 50 percent in any one horizon; averages less than 35 percent in the particle size control section
The sodium adsorption ratio exceeds 45 throughout the control section.
Carbonates: Noneffervescent to violently effervescent in the upper part; strongly or violently effervescent in the lower part
A buried soil occurs in some pedons at depths of 40 to 60 inches
A horizon
Hue: 7.5YR or 10YR.
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 3, 4 or 6, dry or moist.
Reaction: moderately to strongly alkaline.
Salinity: 1 to 7 dS/m.
SAR: 4 to 50.
B horizon
Hue: 7.5YR or 10YR.
Value: 5, 6 or 7 dry, 3, 4 or 5 moist.
Chroma: 2, 4 or 6, dry or moist.
Texture: sandy loam, fine sandy loam (5 to 18 percent clay). Reaction: moderately to very strongly alkaline.
Salinity: 5 to 45 dS/m.
SAR: 45 to 132.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Redun soils are on stream terraces and fan terraces at elevations of 1000 to 1450 feet. They formed in Holocene fan or stream alluvium. Slopes range from 0 to 3 percent. The mean annual precipitation is 7 to 10 inches. The mean annual air temperature is 69 to 75 degrees F. The frost- free period is about 240 to 280 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Casa Grande, Kamato and the similar Shontik and Tatai soils. Casa Grande and Kamato soils have natric horizons.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; slow or very slow permeability.
USE AND VEGETATION: Used for livestock grazing, wildlife habitat and irrigated cropland. Present vegetation is desert saltbush, linear-leaf saltbush and wolfberry.
DISTRIBUTION AND EXTENT: Southern Arizona. MLRA is 40. This series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Gila River Indian Reservation, Arizona; Parts of Maricopa and Pinal Counties, 1991.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from 0 to 6 inches. (A horizon)
Cambic horizon - The zone from 6 to 12 inches (Bw horizon)
Natric subgroup - SAR exceeds 45 throughout the cambic horizon
Classified according to Soil Taxonomy Second Edition, 1999
ADDITIONAL DATA:
NSSL Sample S84 AZ-013-003
NSSL Sample S84 AZ-021-015
BIA Natural Resources Laboratory, Gallup, New Mexico
Bureau of Reclamation hydraulic conductivity data