LOCATION SETTLEDRAN              NV

Established Series
Rev. EWB-JBF-TM-JVC
06/2017

SETTLEDRAN SERIES

The Settledran series consists of very deep, moderately well drained soils that formed in alluvium derived from mixed rocks. Settledran soils are on flood plains. Slopes are 0 to 2 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 Oxyaquic Haploxerolls

TYPICAL PEDON: Settledran clay loam--pasture. (Colors are for dry soil unless otherwise noted.)

Ap--0 to 25 cm; dark gray (10YR 4/1) clay loam, black (N 2/) moist; moderate fine and medium subangular blocky structure; very hard, friable, moderately sticky and moderately plastic; many very fine and common fine roots; many very fine and fine interstitial pores; slightly effervescent; strongly alkaline (pH 8.5); clear smooth boundary. (18 to 30 cm thick)

Bk--25 to 53 cm; light brownish gray (2.5Y 6/2) clay loam, dark grayish brown (2.5Y 4/2) moist; moderate fine and medium subangular blocky structure; moderately hard, friable, moderately sticky and moderately plastic; common very fine and few fine roots; common very fine tubular and interstitial pores; common coarse distinct dark yellowish brown (10YR 4/4) moist masses of iron accumulation; secondary carbonates segregated in common medium seams; violently effervescent; strongly alkaline (pH 9.0); clear smooth boundary. (20 to 36 cm thick)

C1--53 to 81 cm; light brownish gray (2.5Y 6/2) loam, dark grayish brown (2.5Y 4/2) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and fine roots; common very fine tubular and interstitial pores; common medium distinct dark yellowish brown (10YR 4/4) moist masses of iron accumulation and common medium faint dark gray (2.5Y 4/1) moist iron depletions; slightly effervescent; strongly alkaline (pH 8.6); clear smooth boundary. (25 to 36 cm thick)

C2--81 to 102 cm; light brownish gray (2.5Y 6/2) loam, dark grayish brown (2.5Y 4/2) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; few very fine and fine roots; common very fine tubular and interstitial pores; many medium distinct dark yellowish brown (10YR 4/4) moist masses of iron accumulation and many medium faint dark gray (2.5Y 4/1) moist iron depletions; moderately alkaline (pH 8.2); clear smooth boundary. (20 to 40 cm thick)

C3--102 to 152 cm; light brownish gray (10YR 6/2) sandy loam, dark grayish brown (10YR 4/2) moist; massive; soft, very friable, slightly sticky and nonplastic; few very fine and fine roots; few very fine tubular and common very fine interstitial pores; many coarse distinct dark brown (7.5YR 3/4) moist masses of iron accumulation and common medium distinct dark gray (5Y 4/1) moist iron depletions; moderately alkaline (pH 8.2).

TYPE LOCATION: Douglas County, Nevada; about 1 mile northeast of Mottsville near Johnson Slough; approximately 1,730 feet south and 1,800 feet east of the northwest corner of section 2, T. 12 N., R. 19 E.; USGS Minden 7.5 minute topographic quadrangle; latitude 38 degrees 56 minutes 05 seconds N and longitude 119 degrees 49 minutes 08 seconds W; WGS84 Decimal Degrees 38.9347222 latitude, -119.8188889 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Dry in mid summer and early fall, moist in late fall through early summer; aridic soil moisture regime that borders on xeric.
Mean annual soil temperature: 9 to 12 degrees C.
Mollic epipedon thickness: 25 to 50 cm.

Particle-size control section - Clay content: averages 25 to 35 percent.
Rock fragments: 0 to 5 percent. Lithology of fragments is mixed.

Ap horizon
Hue: 2.5Y or 10YR dry, 2.5Y, 10YR, or N (neutral) moist.
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 1 through 3 dry, 0 through 2 moist.
Reaction: Slightly alkaline through strongly alkaline.
Effervescence: Noneffervescent or slightly effervescent.
Organic matter content: 1 to 4 percent.

Bk horizon
Hue: 10YR or 2.5Y.
Value: 5 or 6 dry.
Chroma: 1 through 3, dry or moist.
Texture: Clay loam or loam.
Clay content: 25 to 35 percent.
Reaction: Slightly alkaline to strongly alkaline.
Salinity (EC): 2 to 8 mmhos/cm.
Sodicity (SAR): 0 to 12.
Effervescence: Strongly effervescent or violently effervescent.
Calcium carbonate equivalent: 1 to 5 percent.
Identifiable secondary carbonates: Occurs as few or common seams or filaments.
Redoximorphic features: Occurs as few or common redox concentrations of iron.

C1 and C2 horizons
Hue: 10YR through 5Y.
Value: 4 through 6 dry, 3 or 4 moist.
Chroma: 1 through 3, dry or moist.
Texture: Stratified very fine sandy loam to clay loam.
Clay content: averages 25 to 35 percent.
Rock fragments: 0 to 5 percent.
Salinity (EC): 2 to 8 mmhos/cm.
Sodicity (SAR): 0 to 12.
Consistence: Slightly hard or moderately hard dry, very friable or friable moist.
Reaction: Slightly alkaline through strongly alkaline.
Effervescence: Noneffervescent or slightly effervescent.
Redoximorphic features: Occurs as common to many redox concentrations of iron and/or depletions of iron.

C3 horizon
Hue: 10YR through 5Y.
Value: 4 through 6 dry, 3 or 4 moist.
Chroma: 1 through 3, dry or moist.
Texture: Stratified very gravelly loamy sand to silty clay loam.
Clay content: averages 12 to 20 percent.
Rock fragments: averages 10 to 25 percent, mainly gravel.
Salinity (EC): 0 to 4 mmhos/cm.
Sodicity (SAR): 0 to 12.
Redoximorphic features: Occurs as common to many redox concentrations of iron and/or depletions of iron.

COMPETING SERIES: This is the East Fork series. East Fork soils have a mean annual soil temperature of 12 to 14 degrees C.

GEOGRAPHIC SETTING: Settledran soils are on flood plains. These soils formed in alluvium derived from mixed rocks. Slopes are 0 to 2 percent. Elevations range from 1,400 to 1,465 meters. The climate is semiarid with cool, moist winters and warm, dry summers. The mean annual precipitation is 200 to 250 mm, mean annual temperature is 8 to 11 degrees C, and the frost-free period is 90 to 110 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Heidtman, Job, and Voltaire soils. Heidtman soils have mollic epipedons thicker than 50 cm. Job soils are coarse-loamy and do not have mollic epipedons. Voltaire soils have aquic moisture regimes.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Moderately well drained; medium surface runoff; moderately high saturated hydraulic conductivity. Endosaturation is present with an apparent seasonal high water table between 76 and 100 cm (moderately deep free water occurrence class) from December to May. These soils probably formed under a wetter moisture regime. However, surface and groundwater hydrology have been altered by stream entrenchment and man-caused alterations higher in the watershed.

USE AND VEGETATION: Settledran soils are used for pasture, hayland, and wildlife habitat. The present vegetation is mainly grasses, rushes, and sedges with the composition dependent on management factors.

DISTRIBUTION AND EXTENT: Western Nevada. These soils are not extensive. MLRA 26.

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

SERIES ESTABLISHED: Douglas County, Nevada, 2012.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 25 cm (Ap horizon).
Identifiable secondary carbonates - The zone from 25 to 53 cm (Bk horizon).
Endosaturation feature - The condition of ground water with an upper boundary between 76 and 100 cm during winter and spring in normal years (parts of the C2 and C3 horizons).
Particle-size control section - The zone from 25 to 100 cm (Bk, C1, and C2 horizons).

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National Cooperative Soil Survey
U.S.A.