LOCATION HEIDTMAN                NV

Established Series
Rev. EWB-JVC-JBF
03/2017

HEIDTMAN SERIES

The Heidtman series consists of very deep, moderately well drained soils that formed in alluvium derived mainly from granitic rocks. Heidtman soils are on flood plains and low stream terraces. 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 Cumulic Haploxerolls

TYPICAL PEDON: Heidtman loam--hayland. (Colors are for dry soil unless otherwise noted.)

Ap--0 to 18 cm; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine roots; common very fine tubular and interstitial pores; neutral (pH 7.3); clear smooth boundary. (13 to 28 cm thick)

A1--18 to 41 cm; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and few fine roots; common very fine tubular pores; neutral (pH 7.3); clear smooth boundary. (15 to 30 cm thick)

ABk--41 to 56 cm; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and few fine roots; common very fine tubular and interstitial pores; secondary carbonates segregated in few fine masses and coats on faces of peds; strongly effervescent; moderately alkaline (pH 8.2); clear smooth boundary. (15 to 25 cm thick)

A2--56 to 76 cm; brown (10YR 5/3) loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine and fine roots; common very fine tubular and interstitial pores; slightly effervescent; moderately alkaline (pH 8.4); clear smooth boundary.

A3--76 to 102 cm; grayish brown (10YR 5/2) loam, very dark grayish brown (10YR 3/2) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; few very fine roots; common very fine tubular and interstitial pores; common medium distinct dark yellowish brown (10YR 3/4) moist, masses of iron accumulation; slightly effervescent; moderately alkaline (pH 8.0); clear smooth boundary.

A4--102 to 119 cm; brown (10YR 5/3) sandy loam, dark brown (10YR 3/3) moist; massive, slightly hard, very friable, slightly sticky and nonplastic; few very fine roots; common very fine tubular pores; common medium faint dark yellowish brown (10YR 3/4) moist, masses of iron accumulation; slightly alkaline (pH 7.8); clear smooth boundary. (Combined thickness of the A horizons is more than 100 cm)

Ag--119 to 135 cm; dark gray (10YR 4/1) clay loam, black (10YR 2/1) moist; massive; hard, very friable, moderately sticky and moderately plastic; few very fine roots; common very fine tubular pores; common medium distinct dark brown (10YR 3/3) moist, masses of iron accumulation; slightly alkaline (pH 7.6); clear smooth boundary. (0 to 30 cm thick)

Ccg--135 to 152 cm; gray (10YR 6/1) sandy loam, dark gray (5Y 4/1) moist; massive; hard, very friable, nonsticky and nonplastic; few very fine roots; common very fine tubular and interstitial pores; 25 percent 1 to 3 millimeter diameter nodules of iron; common medium prominent dark yellowish brown (10YR 3/4) moist, masses of iron accumulation; slightly alkaline (pH 7.6).

TYPE LOCATION: Douglas County, Nevada; along the West Fork of the Carson River about 0.75 mile northwest of Centerville; 2,300 feet north and 950 feet west of the southeast corner of section 12, T. l2 N., R. l9 E.; USGS Minden 7.5 minute topographic quadrangle; latitude 38 degrees 55 minutes 1.6 seconds N and longitude 119 degrees 47 minutes 30.5 seconds W; WGS84 Decimal Degrees 38.9171111 latitude, -119.7918056 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Usually dry in the moisture control section, moist in winter and spring, dry in summer and fall unless irrigated; aridic soil moisture regime that borders on xeric.
Mean annual soil temperature: 9 to 12 degrees C.
Mollic epipedon thickness: 100 to 150 cm.
Depth to horizons with secondary carbonates: 25 to 76 cm.
Depth to aquic conditions: 76 to 150 cm.
Other features: Organic carbon content decreases irregularly with depth.

Particle-size control section - Clay content: 18 to 25 percent.
Rock fragments: 5 to 15 percent. Lithology of fragments are mixed.

Ap horizon
Hue: 10YR or 2.5Y.
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 2 or 3, dry or moist.
Organic matter content: 2 to 4 percent.
Reaction: Neutral through moderately alkaline.
Salinity (EC): 2 to 4 mmhos/cm.
Sodicity (SAR): 0 to 5.

ABk horizon
Hue: 10YR or 2.5Y.
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 2 or 3, dry or moist.
Texture: Stratified sandy loam to clay loam, averaging loam.
Organic matter content: 1 or 2 percent.
Salinity (EC): 4 to 8 mmhos/cm.
Sodicity (SAR): 13 to 30.
Identifiable secondary carbonates: Occurs as few or common masses or filaments.
Calcium carbonate equivalent: 1 to 5 percent.

A1 through A4 horizons
Hue: 10YR or 2.5Y.
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 2 or 3, dry or moist; some pedons have thin subhorizons with chroma of 0 (when neutral hue), or 1.
Texture: Stratified sandy loam to clay loam, averaging loam.
Organic matter content: 1 or 2 percent.
Reaction: Neutral through moderately alkaline.
Redoximorphic features: Redox concentrations occur in the lower subhorizons as masses of iron accumulation.

Ag horizon (when present)
Hue: 10YR, 2.5Y, or neutral (N).
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 0 (when neutral hue) or 1, dry or moist.
Texture: Stratified sandy loam to clay loam, averaging loam.
Organic matter content: 1 or 2 percent.
Reaction: Neutral through moderately alkaline.
Salinity (EC): 2 to 4 mmhos/cm.
Sodicity (SAR): 0 to 5.
Redoximorphic features: Redox depletion of iron is present as the gleyed, low chroma matrix. Redox concentrations occur as masses of iron accumulation.

Ccg or Cg horizon
Hue: 10YR through 5Y or neutral (N).
Value: 6 or 7 dry, 4 or 5 moist.
Chroma: 0 (when neutral hue), 1 or 2, dry or moist.
Texture: Stratified very gravelly loamy coarse sand to clay loam.
Clay content: averages 18 to 25 percent.
Rock fragments: averages less than 15 percent, but individual subhorizons have up to 50 percent gravel.
Reaction: Neutral through moderately alkaline.
Salinity (EC): 2 to 4 mmhos/cm.
Sodicity (SAR): 0 to 5.
Redoximorphic features: Redox depletion of iron is present as the gleyed, low chroma matrix. Redox concentrations occur as masses of iron accumulation. Most pedons have 1 to 5 mm diameter nodules of iron.

COMPETING SERIES: These are the Birdow, Blackrock, Collister, Dagor, Draper, Eastcan, Fanu, Goose Creek, Goosenawt, Gosinta, Lakeview, Monroe, Oxy, Shoepeg, Willowdale, and Winn series.

Birdow, Blackrock, Dagor, Fanu, Goosenawt, Monroe, and Willowdale soils do not have endosaturation or aquic conditions within the series control section. Collister, Draper, Goose Creek, Gosinta, Shoepeg, and Winn soils do not have horizons with identifiable secondary carbonates. Eastcan soils are effervescent throughout and do not have horizons with identifiable secondary carbonates. Lakeview soils do not have horizons with identifiable secondary carbonates between 25 and 76 cm. Oxy soils are moderately deep to lithic contacts and do not have endosaturation or aquic conditions.

GEOGRAPHIC SETTING: Heidtman soils are on flood plains and low stream terraces. These soils formed in alluvium derived mainly from granitic rocks. Slopes are 0 to 2 percent. Elevations range from 1,410 to 1,450 meters. The climate is semiarid with cool, moist winters and warm, dry summers. The mean annual precipitation 200 to 250 mm, mean annual temperature is 8 to 11 degrees C, and the frost-free period is 90 to l10 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Mindlebaugh, Fettic, Job, and Voltaire soils. Mindlebaugh soils have aquic conditions between 50 and 76 cm and mollic epipedons less than 50 cm thick. Fettic soils have natric horizons and mollic epipedons less than 50 cm thick. Job soils are coarse-loamy and have ochric epipedons. Voltaire soils have aquic conditions high in the profile and have mollic epipedons less than 50 cm thick.

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 90 and 150 cm (moderately deep and deep free water occurrence classes) from December through May. Cumulative annual duration classes are Common or Persistent. The water table drops to 150 or 180 cm in the fall. These soils are susceptible to occasional flooding for brief periods between December and May.

USE AND VEGETATION: Heidtman soils are used for irrigated cropland, pasture, and hayland. The principal crops are alfalfa hay and small grains.

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 (Carson Valley Area), Nevada l975.

REMARKS: The revision of 4/2000 moves the type location to a more representative area. It also changes the series concept by increasing the thickness of the mollic epipedon and updating the taxonomic subgroup from Fluvaquentic to Cumulic.

Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 135 cm (Ap, A1, ABk, A2, A3, A4, and Ag horizons).
Identifiable secondary carbonates - The zone from 41 to 56 cm (ABk horizon).
Aquic conditions - The conditions and endosaturation, reduction, and redoximorphic features from 119 to 152 cm at some time in normal years (Ag and Ccg horizons).
Particle size control section - The zone from 25 to 100 cm (ABk, A2, and A3 horizons and part of the A1 horizon).

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National Cooperative Soil Survey
U.S.A.