LOCATION RODOCK NV

Established Series
Rev. TM-RLB-JBF
03/2016

RODOCK SERIES

The Rodock series consists of very deep, well drained soils that formed in alluvium derived from mixed rocks with additions of loess and volcanic ash. The Rodock soils are on inset fans, fan aprons, and stream terraces. Slopes are 0 to 8 percent. The mean annual precipitation is about 250 mm and the mean annual temperature is about 8 degrees C.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Duridic Haploxerolls

TYPICAL PEDON: Rodock gravelly sandy loam--rangeland. (Colors are for dry soil unless otherwise noted.)

A1--0 to 5 cm; brown (10YR 5/3) gravelly sandy loam, very dark grayish brown (10YR 3/2) moist; moderate thin platy structure; soft, very friable, nonsticky and nonplastic; common very fine and few fine roots; many very fine, fine and medium vesicular pores; 15 percent gravel; neutral (pH 7.2); abrupt smooth boundary. (3 to 13 cm thick)

A2--5 to 28 cm; brown (10YR 5/3) loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure parting to moderate fine granular; soft, very friable, slightly sticky and slightly plastic; many very fine and common fine roots; many very fine and fine interstitial pores; 10 percent gravel; neutral (pH 7.2); abrupt smooth boundary. (0 to 30 cm thick)

A3--28 to 38 cm; brown (10YR 5/3) loam, dark brown (10YR 3/3) moist; moderate fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common very fine, fine and medium roots; many very fine and fine interstitial pores; slightly alkaline (pH 7.4); clear wavy boundary. (0 to 18 cm thick)

Bw--38 to 51 cm; pale brown (10YR 6/3) gravelly loam, brown (10YR 4/3) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine to coarse roots; common very fine and fine tubular pores; few thin silica coats on ped faces in the lower part; 20 percent gravel; slightly alkaline (pH 7.6); clear wavy boundary. (10 to 30 cm thick)

Bq--51 to 69 cm; pale brown (10YR 6/3) gravelly sandy loam, dark brown (10YR 3/3) moist; massive; very hard, firm, nonsticky and slightly plastic; few very fine roots; common very fine and fine tubular pores; continuous brittle matrix; 50 percent strongly cemented durinodes and irregular concretions; 30 percent gravel; slightly alkaline (pH 7.8); clear wavy boundary. (13 to 23 cm thick)

2Bqk1--69 to 79 cm; pale brown (10YR 6/3) very gravelly loamy coarse sand, dark brown (10YR 3/3) moist; massive; slightly hard, very friable, nonsticky and nonplastic; few very fine and fine roots; common very fine and fine tubular and interstitial pores; continuous brittle matrix; 25 percent strongly cemented durinodes and concretions; few thin carbonate and silica pendants on rock fragments; few fine soft filaments of carbonates; 50 percent gravel and 2 percent cobbles; moderately alkaline (pH 8.4); clear wavy boundary. (10 to 76 cm thick)

2Bqk2--79 to 152 cm; pale brown (10YR 6/3) extremely gravelly coarse sand, very dark grayish brown (10YR 3/2) moist; massive; soft, very friable, nonsticky and nonplastic; common fine and medium roots; many very fine and fine interstitial pores; many thin carbonate and silica pendants on rock fragments; 55 percent gravel, 15 percent cobbles; strongly effervescent; strongly alkaline (pH 8.6).

TYPE LOCATION: Humboldt County, Nevada; approximately one mile northwest of the Kings River Ranch headquarters; about 300 feet north and 2500 feet east of the southwest corner of section 16, T. 46 N., R. 33 E.; USGS Kings River Ranch 7.5 minute topographic quadrangle; latitude 41 degrees 51 minutes 46 seconds N and longitude 118 degrees 15 minutes 34 seconds W; WGS84 Decimal Degrees 41.8627778 latitude, -118.2761111 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Moist in winter and spring, October to late June. Dry from mid-July to mid-October; aridic soil moisture regime bordering on xeric.
Mean annual soil temperature: 8 to 11 degrees C.
Mollic epipedon: 25 to 48 cm thick.
Depth to continuous brittle matrix: 50 to 76 cm.
Depth to secondary carbonates: 50 to 100 cm.

Particle-size control section - Clay content: Averages 10 to 18 percent.
Rock fragments: Averages 35 to 60 percent, mainly gravel.

A horizon
Chroma: 2 or 3.
Reaction: Neutral or slightly alkaline.

Bw horizon
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 2 or 3.
Texture: Loam, very fine sandy loam or fine sandy loam.
Clay content: 15 to 25 percent.
Rock fragment: 0 to 30 percent, mainly gravel.
Reaction: Neutral through moderately alkaline.

Bq and Bqk horizons
Value: 5 through 7 dry, 3 or 4 moist.
Chroma: 2 through 4.
Texture: Stratified; the upper part is loam to gravelly sandy loam and the lower part is very gravelly loam to extremely gravelly coarse sand.
Reaction: Slightly alkaline through strongly alkaline.
Consistence: Subhorizons have continuous brittle matrix; strongly cemented durinodes and coarse masses or pendants are in most pedons.

COMPETING SERIES: There are no competing soils.

GEOGRAPHIC SETTING: Rodock soils are on inset fans, fan aprons and stream terraces. These soils formed in alluvium derived from mixed rocks with additions of loess and volcanic ash. Slopes are 0 to 8 percent. Elevations are 1,300 to 1,800 meters. The climate is cool, semiarid with warm, dry summers and cold, moist winters. The mean annual precipitation is 200 to 300 mm, mean annual temperature is 7 to 9 degrees C, and the frost-free season is 80 to 110 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Hunnton, Kingsriver, and Rio King series. Hunnton soils have clay argillic horizons and duripans. Kingsriver and Rio King soils have coarse-loamy control sections and lack layers of silica cementation.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; slow or medium runoff; moderately high saturated hydraulic conductivity.

USE AND VEGETATION: Rangeland and wildlife habitat. The present vegetation is mainly basin big sagebrush, rabbitbrush and basin wildrye.

DISTRIBUTION AND EXTENT: North-central Nevada. These soils are not extensive. MLRA 23, 24.

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

SERIES ESTABLISHED: Humboldt County, Nevada, East Part, 1992.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the surface to about 38 cm (A1, A2 and A3 horizons).
Cambic horizon - The zone from 38 to 51 cm (Bw horizon).
Duric feature - The zone from 51 to 79 cm (Bq and 2Bkq1 horizons).
Aridic feature - Aridic soil moisture regime bordering on xeric.
Particle-size control - The zone from 25 to 100 cm (A3, Bw, Bq, 2Bqk1 and part of the A2 and 2Bqk2 horizons).

National Cooperative Soil Survey
U.S.A.