LOCATION DUGWAY NVEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Natrixeralfic Natridurids
TYPICAL PEDON: Dugway ashy fine sandy loam--rangeland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 2 inches; pale brown (10YR 6/3) ashy fine sandy loam, dark brown (10YR 3/3) moist; moderate thin and medium platy structure; slightly hard, very friable, slightly sticky, slightly plastic; many very fine roots; many very fine vesicular pores; moderately alkaline (pH 8.0); abrupt wavy boundary. (2 to 5 inches thick)
A2--2 to 5 inches; light brownish gray (10YR 6/2) ashy fine sandy loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; hard, very friable, slightly sticky, slightly plastic; many very fine, common very fine roots; many very fine vesicular and interstitial pores; moderately alkaline (pH 8.0); abrupt wavy boundary. (0 to 4 inches thick)
Btn--5 to 11 inches; pale brown (10YR 6/3) clay, dark brown (10YR 3/3) moist; strong fine and medium prismatic structure; very hard, firm, very sticky and very plastic; many very fine and common fine roots; common very fine tubular pores; many faint and distinct clay films on faces of peds and lining pores; common light gray (10YR 7/2) uncoated sand grains on tops of prisms, brown (10YR 5/3) moist; strongly alkaline (pH 8.6); clear wavy boundary. (4 to 7 inches thick)
Btnk--11 to 18 inches; pale yellow (2.5Y 7/4) silty clay loam, olive brown (2.5Y 4/4) moist; moderate very fine and fine prismatic structure parting to strong very fine and fine angular blocky; hard, friable, sticky, plastic; many very fine, common fine and few medium roots; common very fine tubular pores; common faint and distinct clay films on faces of peds and lining pores; few fine masses of secondary carbonate; strongly alkaline (pH 8.6); clear wavy boundary. (3 to 10 inches thick)
Bqk1--18 to 25 inches; very pale brown (10YR 7/3) silt loam, brown (10YR 4/3) moist; strong very fine and fine angular blocky structure; hard, friable, moderately sticky and moderately plastic; many very fine roots; many very fine tubular pores; common thin silica coats bridging mineral grains; 30 percent discontinuous weak silica and carbonate cementation; common fine masses of secondary carbonate; strongly effervescent; strongly alkaline (pH 9.0); clear wavy boundary. (4 to 8 inches thick)
Bqk2--25 to 35 inches; light gray (2.5Y 7/2) silt loam, light olive brown (2.5Y 5/4) moist; strong thin and medium platy structure; hard and very hard, friable and firm, moderately sticky and moderately plastic; common very fine roots; common very fine tubular pores; 60 percent discontinuous weak silica and carbonate cementation; common thin silica coats bridging mineral grains and lining pores; common fine masses of secondary carbonate; strongly effervescent; strongly alkaline (pH 9.0); clear smooth boundary. (0 to 9 inches thick)
Bqkm--35 to 52 inches; pale yellow (2.5Y 7/3) cemented material, brown (10YR 5/3) moist; strong thin and medium platy structure; very hard, very firm, brittle; continuous and strongly cemented; common very fine and fine roots in horizontal root mat at upper boundary; few very fine tubular pores; few fine masses of secondary carbonate; noneffervescent matrix; strongly alkaline (pH 9.0); abrupt smooth boundary. (5 to 20 inches thick)
2C--52 to 61 inches; light gray (2.5Y 7/2) stratified silt loam and silty clay loam, dark grayish brown (2.5Y 4/2) moist; massive; hard, friable, moderately sticky and moderately plastic; no roots observed; few very fine tubular pores; slightly effervescent; strongly alkaline (pH 9.0).
TYPE LOCATION: Washoe County, Nevada; in Long Valley about 1 mile north of Vya; approximately 2,000 feet west and 900 feet south of the northeast corner of section 33, T. 43 N., R. 19 E.; USGS Vya 7.5 minute topographic quadrangle; 41 degrees 36 minutes 33 seconds north latitude and 119 degrees 51 minutes 21 seconds west longitude, NAD27.
RANGE IN CHARACTERISTICS:
Soil moisture - Moist in the moisture control section in winter and spring; dry from mid-June through October; Aridic moisture regime that borders on xeric.
Mean annual soil temperature - 47 to 51 degrees F.
Depth to duripan - 20 to 40 inches.
Depth to identifiable secondary carbonates - 11 to 24 inches.
Particle-size control section - Clay content: 35 to 50 percent.
A horizons
Value: 6 or 7 dry.
Chroma: 2 or 3, dry or moist.
Reaction: Slightly alkaline or moderately alkaline.
Volcanic glass content: 20 to 50 percent in coarse silt through fine sand fractions.
Oxalate extractable aluminum plus one-half iron: 0.2 to 0.4 percent.
Btn and Btnk horizons
Value: 5 through 7 dry, 3 through 5 moist.
Chroma: 2 through 4, dry or moist.
Clay content: 35 to 50 percent.
Texture: Silty clay loam, silty clay, or clay.
Sodicity (SAR): 13 to 45.
Effervescence: Noneffervescent to strongly effervescent in the upper part; slightly effervescent to violently effervescent in the lower part.
Calcium carbonate equivalent: 1 to 3 percent.
Reaction: Moderately alkaline or strongly alkaline.
Bqk horizons
Value: 6 through 8 dry; 4 or 5 moist.
Chroma: 2 through 4, dry or moist.
Clay Content: 20 to 30 percent.
Texture: Loam, silt loam, or silty clay loam.
Structure: Platy, angular blocky, or subangular blocky.
Consistence: Hard or very hard dry, very friable to firm moist.
Reaction: Moderately alkaline or strongly alkaline.
Effervescence: Strongly effervescent or violently effervescent.
Identifiable secondary carbonates: Few or common fine masses.
Calcium carbonate equivalent: 1 to 5 percent.
Cementation: 20 to 70 percent weak discontinuous silica cementation.
Other features: Few or common silica coats bridging mineral grains.
Bqkm horizon
Cementation: Continuous strong cementation by silica.
2C horizon
Texture: Usually stratified; dominantly silt loam, silty clay loam, but includes strata of loam, clay loam or fine sandy loam.
Structure: Platy or is massive.
Consistence: Hard or very hard dry, very friable to very firm moist.
COMPETING SERIES: These are the Filiran and Newpass series.
Filiran soils have 5 to 20 percent rock fragments in the particle-size control section. Newpass soils are moderately deep to lithic contacts.
GEOGRAPHIC SETTING: Dugway soils are on remnant lake terraces. They formed in lacustrine deposits derived from mixed volcanic rocks and influenced by volcanic ash. Slopes are 0 to 2 percent. Elevations range from 5,300 to 6,000 feet. The mean annual precipitation is 8 to 10 inches, the mean annual air temperature is 45 to 47 degrees F., and the frost-free period is 80 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Langston and Updike soils. Langston soils lack silica cementation and are fine-loamy over sandy or sandy-skeletal. Updike soils lack silica cementation.
DRAINAGE AND PERMEABILITY: Moderately well drained; medium surface runoff; slow permeability (moderately low or moderately high saturated hydraulic conductivity). Endosaturation is present with an apparent seasonal high water table between 5 and 6 feet (very deep free water occurrence class) between January and September. Cumulative annual duration class is Persistent.
USE AND VEGETATION: Dugway soils are used for rangeland. The present vegetation is dominantly basin big sagebrush, rubber rabbitbrush, and basin wildrye. Some areas have been seeded to adapted rangeland grasses.
DISTRIBUTION AND EXTENT: Northwestern Nevada. These soils are moderately extensive. MLRA 23.
MLRA OFFICE RESPONSIBLE: Reno, Nevada.
SERIES ESTABLISHED: Washoe County, Nevada (North Part), 1995. The series was first proposed in Washoe County, Nevada in 1959. The name is from a local feature.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from the soil surface to 5 inches (A1 and A2 horizons).
Natric horizon - The zone from 5 to 18 inches (Btn and Btnk horizons).
Identifiable secondary carbonates - The zone from 11 to 52 inches (Btnk, Bqk1, Bqk2, and Bqkm horizons).
Duripan- The zone from 35 to 52 inches (Bqkm horizon).
Endosaturation feature - The condition of ground water with an upper boundary between 60 and 72 inches at certain times during normal years (part of the 2C horizon).
Particle-size control section - The zone from 5 to 18 inches (Btn and Btnk horizons).
ADDITIONAL DATA: Volcanic ash content and oxalate extractable aluminum plus one-half iron values are estimated based on data for adjacent soils.