LOCATION TOKAY              CA
Established Series
Rev. CSB-MAM-WBS-ET
03/2003

TOKAY SERIES


The Tokay series consists of very deep, well drained soils formed in alluvium derived mainly from granitic rock sources. Tokay soils are on low fan terraces. Slopes are 0 to 2 percent. Mean annual precipitation is about 15 inches and the mean annual temperature is about 60 degrees F.

TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, thermic Typic Haploxerolls

TYPICAL PEDON: Tokay fine sandy loam on a less than 1 percent west facing slope at an elevation of 22 feet in a vineyard. (When described, March 25, 1984, the soil was moist below a depth of 4 inches. Colors are for dry soil unless otherwise stated).

Ap1--0 to 4 inches; grayish brown (10YR 5/2) fine sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine roots; many very fine tubular and interstitial pores; slightly acid (pH 6.1); abrupt wavy boundary. (4 to 10 inches thick)

Ap2--4 to 12 inches; grayish brown (10YR 5/2) fine sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine angular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine, few fine, medium and coarse roots; many very fine and few fine tubular and interstitial pores; slightly acid (pH 6.1); clear wavy boundary. (4 to 8 inches thick)

A--12 to 19 inches; grayish brown (10YR 5/2) fine sandy loam, very dark grayish brown (10YR 3/2) moist; weak coarse angular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine and medium, few fine and coarse roots; many very fine and few fine tubular and interstitial pores; slightly acid (pH 6.1); clear wavy boundary. (6 to 10 inches thick)

BA--19 to 26 inches; grayish brown (10YR 5/2) fine sandy loam, very dark grayish brown (10YR 3/2) moist; massive; very hard, friable, slightly sticky and slightly plastic; common very fine, fine, medium and coarse roots; many very fine and few fine tubular and interstitial pores; slightly acid (pH 6.2); clear wavy boundary. (0 to 10 inches thick)

Bt1--26 to 38 inches; brown (10YR 5/3) fine sandy loam, brown (10YR 4/3) moist; massive; very hard, friable, slightly sticky and slightly plastic; common very fine, fine and medium roots; many very fine tubular and interstitial pores; few thin clay films bridging between mineral grains; neutral (pH 6.7); gradual wavy boundary. (8 to 16 inches thick)

Bt2--38 to 45 inches; pale brown (10YR 6/3) fine sandy loam, brown (10YR 4/3) moist; massive; very hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; many very fine tubular and interstitial pores; few thin clay films bridging between mineral grains; neutral (pH 7.0); clear wavy boundary. (8 to 10 inches thick)

C--45 to 60 inches; pale brown (10YR 6/3) fine sandy loam, brown (10YR 4/3) moist; massive; very hard, friable, nonsticky and nonplastic; common very fine tubular and interstitial pores; slightly alkaline (pH 7.5)

TYPE LOCATION: San Joaquin County, California; about 3 miles west of Lodi; 1,700 feet east of Western Pacific Railroad tracks, 1,200 feet north of Sargent Road and 20 feet west of farm road; 1,275 feet north and 2,600 feet east of the southwest corner of sec. 6, T. 3 N., R. 6 E., MDBM. Lodi North quadrangle.

RANGE IN CHARACTERISTICS: The combined thickness of the A and Bt horizons is 30 to 60 inches. Organic matter is 1 to 3 percent in the surface. The moisture control section is dry between June and October unless irrigated and moist between mid-November and mid- April.

The A horizon is 7.5YR 5/2; 10YR 5/3, 5/2; 2.5Y 5/2. Moist color is 7.5YR 3/2; 10YR 3/3, 3/2; 2.5Y 3/2. Clay content is 10 to 15 percent. It is predominantly slightly acid to slightly alkaline but some pedons are strongly acid or moderately acid as a result of long term applications of sulfur for disease control.

The Bt horizon is 7.5YR 6/4; 10YR 6/4, 7/3, 6/3, 5/3. Moist color is 7.5YR 4/4, 3/4; 10YR 4/4, 4/3. Clay content is 10 to 18 percent. Reaction is slightly acid to moderately alkaline. It is fine sandy loam or sandy loam.

The C horizon is 10YR 7/4, 6/4, 6/3, 7/2, 6/2, 5/4. Moist color is 10YR 5/4, 4/4, 4/3, 4/2, 3/4. Clay content is 5 to 15 percent. Reaction is slightly acid to moderately alkaline. It is fine sandy loam, sandy loam, or coarse sandy loam.

COMPETING SERIES: These are the Acampo, Pfeiffer, San Andreas, Tagus, Veritas and Walong soils. Acampo soils have a Bq horizon within 40 inches. San Andreas and Walong soils have a paralithic contact at 20 to 40 inches. Pfeiffer soils have rock fragments in the control section and a paralithic contact below 40 inches. Tagus soils are calcareous throughout. Veritas soils are calcareous below 8 inches.

GEOGRAPHIC SETTING: The Tokay soils are on low fan terraces at elevations of 10 to 150 feet. Slopes are 0 to 2 percent. The soils formed in alluvium derived mainly from granitic rock sources. Climate is subhumid mesothermal with hot dry summers and cool moist foggy winters. Mean annual precipitation is 13 to 17 inches. Mean annual temperature is 60 to 61 degrees F. Average January temperature is 45 degrees F and average July temperature is 77 degrees F. The frost-free period is 250 to 300 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Columbia, Kingdon, San Joaquin and Tujunga soils. Columbia soils do not have a mollic epipedon and are stratified. Kingdon soils have an argillic horizon. San Joaquin soils have claypan subsoil over a duripan and are moderately deep. Tujunga soils have a sandy textural control section.

DRAINAGE AND PERMEABILITY: Well drained; slow runoff; moderately rapid permeability.

USE AND VEGETATION: Used for irrigated row, field, tree and vine crops and urban development. Vegetation in uncultivated areas consists of annual grasses, forbs and scattered California White Oak.

DISTRIBUTION AND EXTENT: The Tokay soils occur in the northern San Joaquin Valley. The series is of moderate extent in MLRA-17.

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

SERIES ESTABLISHED: San Joaquin County, California, 1990.

REMARKS: The activity class was added to the classification in March of 2003. Competing series were not checked at that time. - ET

Diagnostic horizons and features recognized in this pedon are:

Mollic epipedon - The zone from the surface to 19 inches (Ap1, Ap2, A horizons). Low pH assumed to be the result of sulfur treatments in old vineyard.

Cambic horizon - The zone from 19 to 45 inches (BA, Bt1,Bt2 horizons)


National Cooperative Soil Survey
U.S.A.