LOCATION SPRINGMEADOW            NV

Established Series
Rev. BKP/MPC/JBF
02/2012

SPRINGMEADOW SERIES

The Springmeadow series consists of very deep, poorly drained soils that formed in alluvium derived from welded tuff and reworked lacustrine deposits. Springmeadow soils are on stream terraces and flood plains. Slopes are 0 to 2 percent. The mean annual precipitation is about 250 mm and the mean annual temperature is about 9 degrees C.

TAXONOMIC CLASS: Fine, smectitic, mesic Fluvaquentic Endoaquolls

TYPICAL PEDON: Springmeadow silty clay loam--rangeland. (Colors are for dry soil unless otherwise noted.)

A--0 to 20 cm; gray (10YR 5/1) silty clay loam, dark brown (10YR 3/3) moist; moderate fine subangular blocky structure; hard, friable, very sticky and very plastic; common fine and very fine roots; common fine interstitial pores; noneffervecent; neutral (pH 7.3); clear smooth boundary. (5 to 20 cm thick)

Cg1--20 to 40 cm; gray (10YR 5/1) silty clay, dark grayish brown (10YR 4/2) moist; few (2 percent), coarse, faint, light gray (10YR 7/1) irregular masses of depleted matrix throughout; common (3 percent), fine, distinct, irregular, yellow (2.5Y 7/6) iron masses in the matrix; moderate medium subangular blocky structure; hard, friable, very sticky and very plastic; common fine and very fine roots; common fine interstitial pores; slightly effervescent; neutral (pH 7.3); clear smooth boundary. (20 to 25 cm thick)

Cg2--40 to 110 cm; gray (10YR 5/1) silty clay loam, very dark gray (10YR 3/1) moist; few (2 percent), medium, prominent, light gray (10YR 7/1) irregular masses of depleted matrix throughout; common (5 percent), coarse, faint very pale brown (10YR 8/3) irregular masses in the matrix; common (5 percent), fine, distinct, irregular, yellow (2.5Y 7/6) iron masses in the matrix and around roots; weak medium subangular blocky structure; hard, friable; very sticky and very plastic; few fine and very fine roots; few fine interstitial pores; strongly effervescent; neutral (pH 6.9); clear smooth boundary. (40 to 70 cm thick)

Cg3--110 to 150 cm; stratified gray (10YR 6/1) sandy clay loam, gray (10YR 5/1) moist, and gray (10YR5/1) silty clay, black (10YR2/1) moist; common (5 percent), medium, faint light gray (10YR 7/1) irregular masses in the matrix; massive; hard, friable; moderately sticky and moderately plastic; noneffervecent; strongly acidic (pH 5.4); clear smooth boundary. (30 to 60 cm thick)

TYPE LOCATION: Lincoln County, Nevada; about 1.5 miles northeast of Eagle Valley Reservoir, about 200 yards east of ranger station, Spring Valley; latitude 38 degrees 2 minutes 23.9 seconds N and longitude 114 degrees 10 minutes 40.8 seconds W; UTM 11 747655e, 4214011n; NAD 83.

RANGE IN CHARACTERISTICS:
Soil moisture: Saturated at or near the surface and have aquic conditions for at least one month during normal years, mainly during late winter and spring months. The water table may drop to a depth of 20 cm from late spring through September.
Mean annual temperature: 7 to 10 degrees C.
Mean annual soil temperature: 8 to 11 degrees C.
Mollic epipedon thickness: 18 to 25 cm.
Mineralogy: 5 to 15 percent volcanic glass in the 0.02 to 2 mm fraction and averages 0.01 to 0.09 percent Al plus 1/2Fe, extracted by ammonium oxalate.

Particle-size control section - Clay content: averages 35 to 50 percent.
Rock fragments: 0 to 5 percent. Lithology is dominantly welded tuff.

A horizon
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 1 through 3, dry or moist.

Cg1 horizon
Value: 2 through 5 dry, 3 or 4 moist.
Chroma: 1 or 2 moist.
Redoximorphic features: Few or common, fine or medium depleted masses.
Clay content: 35 to 50 percent.
Reaction: Neutral or slightly alkaline.
Calcium carbonate equivalent: 0 to 2 percent.

Cg2 horizon
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 1 or 2 moist.
Texture: Silty clay loam or silty clay.
Redoximorphic features: Few or common, fine or medium depleted masses.
Clay content: 35 to 50 percent.
Reaction: Neutral or slightly alkaline.
Calcium carbonate equivalent: 0 to 2 percent in upper Cg2 horizons of some pedons.

Cg3 horizon
Value: 5 or 6 dry, 2 through 5 moist.
Chroma: 1 or 2 dry or moist.
Redoximorphic features: Few or common, medium or coarse, faint through distinct depleted masses in the matrix; Values of 7 or 8 dry and moist and Chroma of 1 through 3 dry and moist. Faint iron oxidation around roots in upper Cg3 horizons of some pedons.
Reaction: Slightly acidic through very strongly acidic.
Texture: Stratified sandy clay loam to silty clay loam, stratified silty clay loam to sandy clay, stratified clay loam to clay, stratified silty clay to sandy clay.
Structure: Weak or moderate, medium or coarse subangular blocky, or massive.
Consistence: hard or very hard, friable or firm; moderately sticky or very sticky and moderately plastic or very plastic.

COMPETING SERIES: There are no competing series.

GEOGRAPHIC SETTING: Springmeadow soils are on flood plains and stream terraces. These soils formed in alluvium derived from welded tuff and reworked lacustrine deposits. Slopes are 0 to 2 percent. Elevations range from 1,650 to 2,050 meters. The climate is semiarid with cool, moist winters and warm, dry summers. The mean annual precipitation 200 to 300 mm, mean annual temperature is 7 to 10 degrees C, and the frost-free period is 90 to 110 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Holsine and Buster series. Both soils have calcic horizons. Holsine soils have 60 to 70 percent rock fragments in the upper part of the particle-size control section. Buster soils have 27 to 35 percent clay in the particle-size control section.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Poorly to very poorly drained; medium to high surface runoff; moderately low saturated hydraulic conductivity. Endosaturation is present with an apparent high water table to the surface throughout the year. These soils are susceptible to very frequent flooding for long periods to occasional flooding for long periods in most years. Drained phases are recognized.

USE AND VEGETATION: Irrigated pasture and hayland, livestock grazing, and wildlife habitat. The present vegetation is mainly tufted hairgrass, Nevada bluegrass, and sedge. This soil is correlated to ecological site R028AY072NV, Wet Meadow.

DISTRIBUTION AND EXTENT: Eastern Nevada. These soils are not extensive. MLRA 28A.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona.

SERIES ESTABLISHED: Lincoln County (Meadow Valley Area NV713), Nevada, 2010.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the surface to 20 cm (A horizon).
Redoximorphic features - The zone from 20 to 150 cm (Cg2 and Cg3 horizons).
Aquic conditions - The zone from the surface to 150 cm, conditions of endosaturation, reduction, and redoximorphic features at certain times during normal years (A, Cg1, Cg2, and Cg3 horizons).
Fluvaquentic feature - An irregular decrease in organic matter between 40 and 150 cm (Cg2 and Cg3 horizons).
Particle-size control section - The zone from 25 to 100 cm (parts of the Cg1 and Cg2 horizons).

ADDITIONAL DATA: User pedon ID: 08NV613115-MPC

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National Cooperative Soil Survey
U.S.A.