LOCATION REZAVE NV

Established Series
Rev. OWB/WED/JVC/JBF
05/2016

REZAVE SERIES

The Rezave series consists of shallow, well drained soils that formed in residuum and colluvium derived from volcanic rocks. Rezave soils are on summits and side slopes of hills, mountains, and plateaus. Slopes are 0 to 50 percent. The mean annual precipitation is about 150 mm and the mean annual temperature is about 11 degrees C.

TAXONOMIC CLASS: Clayey, smectitic, mesic Lithic Natrargids

TYPICAL PEDON: Rezave stony very fine sandy loam--rangeland. (Colors are for dry soil unless otherwise noted.) The soil surface is covered with approximately 15 percent stones, 10 percent cobbles, and 5 percent gravel.

A--0 to 10 cm; light brownish gray (10YR 6/2) stony very fine sandy loam, dark brown (10YR 3/3) moist; moderate medium and coarse subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and fine roots; few very fine and fine tubular pores; 10 percent gravel, 5 percent cobbles, and 15 percent stones; slightly alkaline (pH 7.4); abrupt smooth boundary. (3 to 15 cm thick)

Btn--10 to 33 cm; light yellowish brown (10YR 6/4) stony clay, dark yellowish brown (10YR 4/4) moist; strong medium and coarse prismatic structure; hard, friable, moderately sticky and moderately plastic; few very fine and fine roots and common medium roots; few very fine, fine and medium tubular pores; 5 percent gravel, 5 percent cobbles, and 10 percent stones; common distinct clay films on faces of peds and lining pores; slightly effervescent; strongly alkaline (pH 8.8); abrupt wavy boundary. (10 to 30 cm thick)

Btnqk--33 to 43 cm; reddish yellow (7.5YR 7/6) very gravelly clay, brownish yellow (10YR 6/6) moist; moderate fine and medium angular blocky structure; hard and brittle, moderately sticky and moderately plastic; few roots; few fine tubular pores; 30 percent gravel, 2 percent cobbles, and 10 percent stones; common faint and few distinct clay films on faces of peds and lining pores; weak discontinuous silica cementation; few carbonate coats on bottoms of rock fragments; violently effervescent; very strongly alkaline (pH 9.2); clear broken boundary. (0 to 23 cm thick)

Bqk--43 to 48 cm; white (10YR 8/1) very stony clay loam, pink (7.5YR 7/4) moist; massive; very hard and brittle, slightly sticky and slightly plastic; few fine roots; few very fine and fine tubular pores; 20 percent gravel, 5 percent cobbles and 15 percent stones; weak discontinuous silica cementation; common carbonate coats on bottoms of rock fragments; violently effervescent; very strongly alkaline (pH 9.6); abrupt wavy boundary. (0 to 8 cm thick)

R--48 cm; hard, slightly fractured basalt.

TYPE LOCATION: Washoe County, Nevada; about 6 miles north of Fernley; approximately 740 feet north and 1,000 feet west of the southeast corner of section 7, T. 21 N., R. 25 E.; USGS Two Tips 7.5 minute topographic quadrangle; latitude 39 degrees 41 minutes 48.7 seconds N and longitude 119 degrees 12 minutes 42.6 seconds W; WGS84 Decimal Degrees 39.6968333 latitude, -119.211722 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Usually dry, moist for short periods in winter and spring; dry early June through October; typic aridic soil moisture regime.
Mean annual soil temperature: 11 to 13 degrees C.
Depth to bedrock; 36 to 50 cm to a lithic contact.
Other features: Some pedons have a thin E horizon between the A and Btn horizons.

Particle-size control section - Clay content: 35 to 55 percent.
Rock fragments: Average 15 to 35 percent, subhorizons range from 10 to 50 percent, increasing with depth. Lithology of the fragments is volcanic rock, such as basalt, andesite and tuff.

A horizon
Value: 6 or 7 dry, 3 or 4 moist.
Chroma: 2 through 4, dry or moist.
Reaction: Neutral through moderately alkaline.

Btn horizon
Hue: 7.5YR or 10YR.
Value: 4 through 6 dry, 3 or 4 moist.
Chroma: 3 through 6, dry or moist.
Texture: Clay or clay loam.
Clay content: 35 to 55 percent.
Rock fragments: 10 to 25 percent, mainly stones or gravel.
Structure: Prismatic or prismatic parting to angular blocky in the upper part and prismatic parting to angular blocky or angular blocky in the lower part.
Consistence: Moderately sticky or very sticky and moderately plastic or very plastic, wet.
Effervescence: Slightly effervescent through violently effervescent.
Calcium carbonate equivalent: 1 to 5 percent.
Reaction: Moderately alkaline or strongly alkaline.
Salinity (EC): 2 to 8 mmhos/cm.
Sodicity (SAR): 13 to 30.

Btnqk and Bqk horizon (when present)
Value: 7 or 8 dry, 6 or 7 moist.
Chroma: 1 through 4, dry or moist.
Texture: Clay or clay loam.
Rock fragments: 20 to 50 percent, mainly gravel or stones.
Clay content: 35 to 45 percent.
Cementation: Weak to strong, discontinuous silica and carbonate cementation.
Calcium carbonate equivalent: 5 to 15 percent; carbonates are commonly segregated on bottoms of rock fragments.
Reaction: Strongly alkaline or very strongly alkaline.
Salinity (EC): 2 to 8 mmhos/cm.
Sodicity (SAR): 13 to 30.

COMPETING SERIES: At present, there are no other series in this family.

GEOGRAPHIC SETTING: Rezave soils are on hills, mountains, and plateaus. They typically occur on summit, shoulder, and backslope positions. They formed in residuum and colluvium derived from volcanic rocks. Slopes are 0 to 50 percent. Elevations range from 1,220 to 2,134 meters. The climate is arid with cool, moist winters and hot, dry summers. The mean annual precipitation is 130 to 180 mm, the mean annual temperature is 9 to 12 degrees C, and the frost-free period is 90 to 120 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Fireball and Pirouette soils. Fireball soils are loamy-skeletal, deep to hard bedrock, and occur on adjacent hills and mountains. Pirouette soils are loamy-skeletal, shallow to a thin duripan over hard bedrock, and occur on adjacent hills and mountains.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; high or very high surface runoff; moderately low saturated hydraulic conductivity.

USE AND VEGETATION: Rezave soils are used for livestock grazing and wildlife habitat. The present vegetation is mainly Bailey's greasewood, shadscale, bud sagebrush, Douglas rabbitbrush, Indian ricegrass, and desert needlegrass.

DISTRIBUTION AND EXTENT: Western and northwestern Nevada. These soils are moderately extensive. They occur dominantly in MLRA 27, but have also been mapped in MLRAs 23 and 24.

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

SERIES ESTABLISHED: Washoe County, Nevada, South Part, 1980.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from the soil surface to 10 cm (A horizon).
Natric horizon - The zone from 10 to 43 cm (Btn and Btnqk horizons)
Identifiable secondary carbonates - The zone from 33 to 48 cm (Btnqk and Bqk horizons).
Lithic contact - The boundary at 48 cm to underlying hard bedrock (R layer).
Particle-size control section - The zone from 10 to 43 cm (Btn and Btnqk horizons).

ADDITIONAL DATA: Primary characterization data is available as user pedon ID 78NV031001 (pedon # 78P0590).

NASIS pedon and site ID 06NV628Z101jbf.

National Cooperative Soil Survey
U.S.A.