LOCATION HUEVI                   NV+AZ

Established Series
Rev. DJM/LJL/RLB/ET
04/2015

HUEVI SERIES

The Huevi series consist of very deep, well drained soils that formed in mixed gravelly alluvium. The Huevi series are on fan remnants, ballenas and fan terraces. Slope ranges from 1 to 70 percent. The mean annual precipitation is about 5 inches and the mean annual air temperature is about 72 degrees F.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, hyperthermic Durinodic Haplocalcids

TYPICAL PEDON: Huevi extremely gravelly sandy loam, rangeland and wildlife habitat. (Colors are for dry soil unless otherwise noted.) The soil surface is covered by approximately 60 percent pebbles and 15 percent cobbles.

A--0 to 5 inches; pale brown (10YR 6/3) extremely gravelly sandy loam, brown (10YR 4/3) moist; weak thick platy structure; soft, very friable, nonsticky and nonplastic; few very fine roots; many very fine and fine interstitial pores; 60 percent pebbles and 15 percent cobbles; strongly effervescent; strongly alkaline (pH 8.5); clear smooth boundary. (2 to 6 inches thick)

Bkq--5 to 18 inches; pale brown (10YR 6/3) very gravelly sandy loam, brown (10YR 4/3) moist; massive; soft, very friable, nonsticky and nonplastic; many very fine and fine and few medium roots; many very fine and fine interstitial and few fine tubular pores; common medium calcium carbonate and silica coats on the bottom of rock fragments; common medium calcium carbonate occurring as concretions and soft masses; 50 percent pebbles and 5 percent cobbles; violently effervescent; moderately alkaline (pH 8.4); clear wavy boundary. (6 to 15 inches thick)

2Bqk--18 to 60 inches; very pale brown (10YR 7/3) extremely cobbly coarse sandy loam, brown (10YR 4/3) moist; massive; slightly hard, friable, nonsticky and nonplastic; few very fine through medium roots; common fine interstitial pores; 40 percent discontinuously weakly silica and calcium carbonate cemented with common medium strongly silica and calcium carbonate cemented masses occurring as lenses and concretions that are brittle when moist; common coarse silica and calcium carbonate coats and pendants on the bottom of rock fragments; 35 percent pebbles and 40 percent cobbles; violently effervescent; moderately alkaline (pH 8.4).

TYPE LOCATION: Clark County, Nevada; located in Cottonwood Valley, Lake Mead National Recreation Area; approximately 1.3 miles southeast of the Nine Mile Basin road turn off, along the powerline road; about 2,480 feet north and 2,330 feet west of the southeast corner of section 36, T. 29 S., R. 65 E.; USGS Spirit Mountain NW, NV 7.5 minute topographic quadrangle; 35 degrees, 22 minutes, and 35 seconds north latitude, 114 degrees, 40 minutes, and 55 seconds west longitude; UTM 11s, 710573e, 3917251n; NAD 83.

RANGE IN CHARACTERISTICS:

Soil moisture - Usually dry, moist in some part during winter and spring and intermittingly moist in the upper part following summer convection storms; typic aridic soil moisture regime.

Soil temperature - 72 to 78 degrees F.

Depth to calcic horizon - 2 to 6 inches.

Depth to duric feature - 8 to 21 inches.

Control section - Clay content: 8 to 18 percent.

Rock fragments: 35 to 80 percent gravel and cobbles.

Calcium carbonate equivalent in the less than 20 millimeter fraction: 15 to 35 percent.

A horizon - Hue: 10YR or 7.5YR

Value: 5 to 7 dry, 4 or 5 moist.

Chroma: 2 to 6 dry, 3 or 4 moist

Bkq horizon - Hue: 10YR or 7.5YR

Value: 6 or 7 dry, 4 to 6 moist.

Chroma: 2 to 6 dry, 3 or 4 moist

Texture: Sandy loam, fine sandy loam, loam.

Consistence: Soft or slightly hard, very friable or friable.

Structure: Massive or subangular blocky.

2Bqk horizon - Hue: 10YR or 7.5YR

Value: 6 to 8 dry, 4 to 6 moist.

Chroma: 2 to 6 dry or moist

Texture: Coarse sandy loam, sandy loam, fine sandy loam, very fine sandy loam, loam.

Consistence: Slightly hard through hard, friable or firm.

Structure: Massive or platy.

Cementation: Discontinuously weakly cemented silica and calcium carbonate, with 20 to 50 percent strong silica and calcium carbonate cementation occurring as concretions, durinodes, or lenses within the matrix. These are hard or very hard when dry, very firm when moist, brittle, and does not slake in dilute hydrochloric acid.

COMPETING SERIES: There are no competing series.

GEOGRAPHIC SETTING: Huevi soils are on fan remnants, ballenas and fan terraces. These soils formed in mixed gravelly alluvium. Slope ranges from 1 to 70 percent. The elevations are 480 to 3,000 feet. The climate is low-latitude desert, with mild winters and very hot summers. Precipitation is greatest in the winter with a lesser secondary peak in summer, typical of the Mojave Desert.. The mean annual precipitation is 3 to 7 inches; the mean annual air temperature is 70 to 78 degrees F., and the frost free season is 240 to 365 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Carrizo, Cipriano, and Riverbend series. Carrizo soils lack a calcic horizon and have a sandy-skeletal particle-size control section. Cipriano soils have a duripan at depths of less than 20 inches. Riverbend soils have a sandy-skeletal particle-size control section and lack a silica cemented horizon.

DRAINAGE AND PERMEABILITY: Well drained; low through high runoff; moderate or moderately rapid permeability.

USE AND VEGETATION: These soils are used for rangeland and wildlife habitat. The present vegetation is mainly creosote bush, range ratany, and various annuals.

DISTRIBUTION AND EXTENT: Mojave Desert of southern Nevada and northwestern Arizona; MLRA 30. These soils are extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: PHOENIX, ARIZONA

SERIES ESTABLISHED: Mohave County, Arizona; Soil survey of the Shivwits Area, Arizona, Part of Mohave County; 1994.

REMARKS: Classified according to Keys to Soil Taxonomy Ninth Edition, 2003.

Diagnostic horizons and features recognized in this pedon are:

Ochric epipedon - 0 to 5 inches (A horizon)

Calcic horizon - 5 to 18 inches (Bkq horizon)

Duric feature - 18 to 60 inches (2Bqk horizon)

Particle-size control section - 10 to 40 inches (Bkq and 2Bqk horizons)

Responsibility for this series was transferred from Davis to Phoenix 4/2015. The last revision to the series was 5/2006. ET

---

National Cooperative Soil Survey
U.S.A.