LOCATION ZOLA                    ID

Established Series
Rev. KAB/ALH/CLM
12/2019

ZOLA SERIES

The Zola series consists of very deep, moderately well drained soils that formed in recent alluvium from volcaniclastic materials. They are on stream terraces and floodplains. Permeability is slow or moderately slow. Slopes range from 0 to 2 percent. The average annual precipitation is about 360 mm, and the average annual temperature is about 5.6 degrees C.

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, frigid Cumulic Haploxerolls

TYPICAL PEDON: Zola loam -- on a slope of 1 percent under rangeland vegetation at 1,680 meters elevation. (When described on September 26, 1979, the soil profile was slightly moist throughout. Colors are for air dry soil unless otherwise noted.)

A--0 to 13 cm; grayish brown (10YR 5/2) loam, black (10YR 2/1) moist; moderate medium platy structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine and fine tubular pores; neutral (pH 6.9); clear smooth boundary. (8 to 18 cm thick)

Bw1--13 to 33 cm; dark grayish brown (10YR 4/2) loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine and fine tubular pores; neutral (pH 6.9); clear smooth boundary. (15 to 53 cm thick)

Bw2--33 to 53 cm; brown (10YR 5/3) loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular or blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots; common very fine and fine tubular pores; slight effervescence (12 percent calcium carbonate); moderately alkaline (pH 8.0); abrupt smooth boundary. (18 to 36 cm thick)

Bk1--53 to 71 cm; grayish brown (10YR 5/2) clay loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few very fine and fine roots; few very fine and fine tubular pores; strong effervescence (12 percent calcium carbonate); carbonates occur in common medium irregularly shaped filaments or threads; moderately alkaline (pH 8.0); clear smooth boundary. (15 to 33 cm thick)

Bk2--71 to 99 cm; gray (10YR 5/1) clay loam, very dark gray (10YR 3/1) moist; moderate medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few very fine and fine roots; few very fine and fine tubular pores; slight effervescence (9 percent calcium carbonate); carbonates occur in few fine irregularly shaped soft masses; moderately alkaline (pH 8.1); abrupt smooth boundary. (0 to 38 cm thick)

2Bk1--99 to 137 cm; very dark grayish brown (10YR 3/2) clay, very dark gray (10YR 3/1) moist; massive; very hard, very firm, very sticky and very plastic; few very fine roots; few fine tubular pores; slight effervescence (7 percent calcium carbonate); carbonates occur in few fine irregularly shaped soft masses; moderately alkaline (pH 7.9); abrupt smooth boundary. (0 to 46 cm thick)

2Bk2--137 to 178 cm; light yellowish brown (2.5Y 6/4) gravelly sandy clay, grayish brown (2.5Y 5/2) moist; common fine faint mottles (7.5YR 4/6) moist; 30 percent gravel; massive; very hard, very firm, very sticky and very plastic; few fine tubular pores; slight effervescence (6 percent calcium carbonate); carbonates occur in few fine irregularly shaped soft masses; neutral (pH 7.2).

TYPE LOCATION: Twin Falls County, Idaho; about 18 miles southeast of Rogerson, Idaho; about 900 feet south and 1,470 feet west of the northeast corner sec. 36, T. 16 S., R. 17 E.; USGS Gollaher Mountain 7.5-minute topographic quadrangle; latitude 41 degrees 59 minutes 43.7 seconds N and longitude 114 degrees 24 minutes 19.0 seconds W; WGS84 Decimal Degrees 41.9954722 latitude, -114.4052778 longitude.

RANGE IN CHARACTERISTICS:
Mollic epipedon thickness - 60 to 137 cm.
Depth to calcium carbonates - 30 to 71 cm.
Depth to high water table - 122 to 178 cm.
Depth to mottles - 90 to 137 cm.
Soil Moisture: This soil is usually moist but dry for 45 to 70 consecutive days during the late summer and autumn. Typic xeric moisture regime.
Depth to bedrock - more than 152 cm.
Particle-size control section (clay average) - 27 to 33 percent.
Average annual soil temperature - 6.1 to 8.3 degrees C.
Average summer soil temperature - 15.0 to 17.2 degrees C.

A horizon
Value - 4 or 5 dry,2 or 3 moist.
Chroma - 1 to 3 dry or moist.
Reaction (pH) - neutral or mildly alkaline.

Bw horizons
Value - 4 or 5 dry
Chroma - 1 to 3 dry or moist
Texture - L, CL, SICL

Bk horizons
Hue - 2.5Y or 10YR.
Value - 3 to 6 dry, 3 or 4 moist.
Chroma - 1 to 4 dry or moist.
Texture - L, SIL, CL, SIC, C.
Gravel content - 0 to 5 percent.
Structure - subangular or angular blocky.
Effervescence - slight or strong.


2Bk horizons
Hue - 2.5Y or 10YR.
Value - 3 to 6 dry, 3 or 4 moist.
Chroma - 1 to 4 dry or moist.
Texture (range) - LCOS through C.
Gravel content - 0 to 35 percent.
Mottles - fine or medium; faint to prominent.
Effervescence - none through strong.

COMPETING SERIES: These are the Koosharem and Toehead series. Koosharem soils have less than 27 percent clay in the control section. Koosharem and Toehead soils are well drained and lack mottles.

GEOGRAPHIC SETTING: Zola soils are on stream terraces and floodplains. The slopes range from 0 to 2 percent. The soils formed in recent alluvium from volcaniclastic materials. Elevations are 1,345 to 1,785 meters. The average annual precipitation is 300 to 410 mm and the average annual temperature is 5.0 to 7.2 degrees C. The frost-free period is 70 to 100 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are Aninto and Tucker soils. Aninto soils are clayey-skeletal, well drained, and occur on terrace sideslopes. Tucker soils are fine, somewhat poorly drained, and occur on lower terraces.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Moderately well drained; slow runoff; moderately slow or slow saturated hydraulic conductivity.

USE AND VEGETATION: Zola soils are used mainly for rangeland, irrigated hayland, and wildlife habitat. The dominant natural vegetation is Idaho fescue, basin wildrye, bluebunch wheatgrass, bluegrass, big sagebrush, and carex.

DISTRIBUTION AND EXTENT: Zola soils are of small extent in southern Idaho and in northern Nevada.

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

SERIES ESTABLISHED: Owyhee County, Idaho; Duck Valley Indian Reservation, Idaho-Nevada, 1984.

REMARKS: Diagnostic horizons and other features recognized in this pedon:
Mollic epipedon (Cumulic with irregular decrease in O.M.) - The zone from the soil surface to 137 cm (The A, Bw1, Bw2, Bk1, Bk2, and 2Bk3 horizons).
Particle-size control section - The zone from 25 to 100 cm (The Bw2, Bk1, Bk2 and parts of the Bw1 and 2Bk1 horizons).


The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.

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National Cooperative Soil Survey
U.S.A.