LOCATION ALLOR                   NV

Established Series
Rev. CEJ/GJS/JVC/JBF
11/2016

ALLOR SERIES

The Allor series consists of very deep, well drained soils formed in alluvium derived from mixed rocks. Allor soils are on fan remnants. Slopes are 0 to 30 percent. The mean annual precipitation is about 230 mm and the mean annual temperature is about 9 degrees C.

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Durinodic Xeric Haplargids

TYPICAL PEDON: Allor gravelly loam--rangeland. (Colors are for dry soil unless otherwise noted). The soil surface is partially covered by approximately 30 percent gravel.

A1--0 to 15 cm; pale brown (10YR 6/3) gravelly loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; common very fine and fine vesicular pores; 15 percent gravel; slightly alkaline (pH 7.8); abrupt smooth boundary. (8 to 18 cm thick)

A2--15 to 30 cm; pale brown (10YR 6/3) loam, brown (10YR 4/3) moist; moderate medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; common very fine and fine tubular pores; 5 percent gravel; slightly alkaline (pH 7.8); abrupt smooth boundary. (0 to 15 cm thick)

Bt--30 to 48 cm; pale brown (10YR 6/3) gravelly clay loam, brown (10YR 4/3) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and moderately plastic; many very fine and fine roots; common very fine tubular pores; few faint clay films on faces of peds; 15 percent gravel; slightly alkaline (pH 7.8); clear smooth boundary. (8 to 18 cm thick)

Btq--48 to 86 cm; pale brown (10YR 6/3) gravelly clay loam, dark yellowish brown (10YR 4/4) moist; moderate medium angular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; many very fine and fine roots; common very fine and fine tubular pores; few distinct and common faint clay films on faces of peds; 25 percent gravel; 15 percent weakly cemented durinodes; slightly alkaline (pH 7.8); clear smooth boundary. (20 to 38 cm thick)

Bq--86 to 107 cm; pale brown (10YR 6/3) gravelly loamy sand, brown (10YR 4/3) moist; massive; very hard, firm, nonsticky and nonplastic; discontinuous weak silica cementation; few fine roots; few fine tubular pores; 25 percent gravel and 5 percent cobbles; slightly alkaline (pH 7.8); clear smooth boundary. (15 to 40 cm thick)

Bqk--107 to 152 cm; pale brown (10YR 6/3) extremely gravelly loamy sand, brown (10YR 4/3) moist; massive; very hard, firm, nonsticky and nonplastic; discontinuous weak silica cementation; 55 percent gravel and 5 percent cobbles; slightly effervescent; moderately alkaline (pH 8.3).

TYPE LOCATION: Lander County, Nevada; about 10 miles north of Austin; approximately 650 feet south and 2,400 feet west of the northeast corner of section 21, T. 20 N., R. 45 E.; USGS Barton Spring 7.5 minute topographic quadrangle; latitude 39 degrees 35 minutes 15 seconds N and longitude 116 degrees 55 minutes 18 seconds W; WGS84 Decimal Degrees 39.5875000 latitude, -116.9216667 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Usually moist in winter and spring; dry in summer and fall; aridic moisture regime that borders on xeric.
Mean annual soil temperature: 8 to 10 degrees C.
Depth to base of argillic horizon: 50 to 86 cm.
Depth to Bq horizon: 50 to 86 cm.
Depth to carbonates: More than 100 cm when present.
Reaction: Slightly alkaline or moderately alkaline, usually increasing with depth.
Other features: Some pedons have BA and/or Bt2 horizons.

Particle-size control section - Clay content: 27 to 35 percent.
Rock fragments: l5 to 35 percent, mainly gravel.

A horizon
Value: 3 or 4 moist.
Chroma: 2 or 3, dry or moist.

Bt and Btq horizons
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 3 or 4 dry or moist.
Texture: Clay loam or sandy clay loam.
Durinodes: Up to 15 percent in the Btq horizon in most pedons.

Bq and Bqk horizons
Value: 5 through 7 dry, 4 or 5 moist.
Chroma: 3 or 4, dry or moist.
Texture: Loamy sand or sandy loam.
Rock fragments: 20 to 60 percent, mainly gravel.
Secondary silica: Discontinuous weak cementation; Some pedons are stratified with noncemented layers.

COMPETING SERIES: These are the Aladshi, Alley, Chime, Cleghorn, Glyphs, Igert, Mimentor, Nevador, Qwynn, Wedertz, Wedlar, and Zevadez series.

Aladshi and Wederdz soils have slightly acid or neutral A horizons. Alley soils have carbonates within 40 to 56 cm. Chime soils have a paralithic contact at 50 to 75 cm. Cleghorn soils have 0 to 5 percent gravel in the particle-size control section. Glyphs and Zevadez soils have continuous weakly cemented horizons at depth of 30 to 50 cm. Igert soils are moderately deep to hard bedrock. Mimentor soils have A horizons that are neutral. Qwynn soils have 18 to 27 percent clay in the particle-size control section. Nevador soils have segregated carbonates with a depth of 100 cm and have Cq horizons that have durinodes in a friable matrix. Wedlar soils have additional soil moisture from thunderstorms during the summer months.

GEOGRAPHIC SETTING: Allor soils occur on fan remnants. These soils formed in alluvium derived from mixed rocks. Elevations are 1,590 to 2,075 meters. Slopes are 0 to 30 percent. The climate is semiarid with warm, dry summers and cool, moist winters. The mean annual precipitation is 200 to 250 mm; mean annual temperature is 8 to 9 degrees C, and the frost-free season is 90 to 110 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Wieland and Zaidy soils. Wieland soils have more than 35 percent clay in their argillic horizons. Zaidy soils have a strongly cemented duripan.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; moderately high saturated hydraulic conductivity.

USE AND VEGETATION: Allor soils are used for livestock grazing and wildlife habitat. The present vegetation is mainly Wyoming big sagebrush, Sandberg's bluegrass, and bottlebrush squirreltail.

DISTRIBUTION AND EXTENT: Central Nevada. These soils are moderately extensive. MLRA 28B.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California.

SERIES ESTABLISHED: Lander County, Nevada, South Part, 1985.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from the soil surface to 30 cm (A1 and A2 horizons).
Argillic horizon - The zone from 30 to 86 cm (Bt and Btq horizons).
Durinodes - The zone from 48 to 86 cm (Btq horizon).
Duric feature - The zone from 86 to 152 cm (Bq and Bqk horizons).
Particle-size control section - The zone from 30 to 80 cm (Bt horizon and part of the Btq horizon).

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National Cooperative Soil Survey
U.S.A.