LOCATION SHINKEE                 CA

Established Series
Rev. CVS-MAM-ET
05/2016

SHINKEE SERIES

The Shinkee series consists of very deep, very poorly drained soils formed in material weathered from hydrophytic plant remains over alluvium. Shinkee soils are in fresh water marshes and river channels. Slope is less than 2 percent. The annual precipitation is about 355 millimeters (14 inches) and the annual temperature is about 15.5 degrees C (60 degrees F).

TAXONOMIC CLASS: Loamy, mixed, euic, thermic Terric Haplosaprists

TYPICAL PEDON: Shinkee muck - on a west facing slope of less than 1 percent in an asparagus field at 1.2 meters (4 feet) below sea level. (Colors are for moist soil unless otherwise noted. The pH is by 0.01M Calcium chloride for organic layers.)

Oap --0 to 25 centimeters (0 to 10 inches); black (10YR 2/1) muck (sapric material), black (10YR 2/1) rubbed, dark gray (10YR 4/1) dry; moderate fine granular structure; soft, very friable, nonsticky and nonplastic; strongly acid (pH 5.5); gradual smooth boundary. (20 to 25 centimeters thick)

Oa --25 to 56 centimeters (10 to 22 inches); black (10YR 2/1) muck (sapric material), black (10YR 2/1) rubbed, very dark gray (10YR 3/1) dry; 20 percent tule and reed fibers unrubbed, less than 5 percent rubbed; weak thick platy structure; slightly hard, friable, slightly sticky and nonplastic; many medium and fine roots; strongly acid (pH 5.5); clear wavy boundary. (25 to 63 centimeters thick)

2Cg1--56 to 66 centimeters (22 to 26 inches); very dark grayish brown (2.5Y 3/2) mucky clay loam, dark grayish brown (2.5Y 4/2) dry; few fine prominent dark red (2.5YR 3/6) and dark reddish brown (2.5YR 3/4) redoximorphic concentrations, yellowish red (5YR 4/6) dry; massive; hard, firm, slightly sticky and plastic; many fine roots; few very fine tubular pores; slightly acid (pH 6.5); abrupt wavy boundary. (8 to 13 centimeters thick)

2Cg2 --66 to 152 centimeters (26 to 60 inches); dark grayish brown (2.5Y 4/2) fine sandy loam, grayish brown (2.5Y 5/2) dry; common medium prominent dark red (2.5YR 3/6) redoximorphic concentrations, yellowish red (5YR 4/6) dry; massive; slightly hard, friable, nonsticky and nonplastic; common fine roots; few very fine tubular pores; strongly acid (pH 5.5).

TYPE LOCATION: San Joaquin County, California; East side of Victoria Island, 460 meters East and 183 meters South of the California-4 Bridge crossing the Middle River; 37 degrees, 53 minutes, 12 seconds N. latitude and 121 degrees, 29 minutes, 42 seconds W. longitude in an unsectionized area. USGS Holt, California 7.5 minute topographic quadrangle.

RANGE IN CHARACTERISTICS:
Depth to mineral layer ranges from 20 to 35 inches.
Mean annual soil temperature: 16.5 degrees C.
The Oa horizons have 35 to 65 percent organic matter by weight by combustion method, but typically have from 40 to 55 percent.
The fiber content ranges from a trace to 40 percent before rubbing and from 0 to 10 percent after rubbing. Clay content of the underlying mineral soil ranges from 15 to 35 percent.

The Oa horizon
Hue: 10YR or N
Value: 2 moist, 3 or 4 dry
Chroma: 0 or 1 moist and 1 dry
Organic matter: Upper part is 35 to 50 percent, lower part is 40 to 65
Fibers after rubbing: Upper less than 5 percent, lower trace to 10 percent
Structure: Weak to strong granular
Reaction: Undried very strongly acid to slightly acid in 0.01 M calcium chloride.

The upper Cg horizon
Hue: 2.5y moist and 2.5Y or 5Y dry
Value: 3 moist, 3 or 4 dry
Chroma: is 2 moist, 4 or 6 dry
Texture of the fine earth: clay loam or silty clay loam with mucky modifiers
Reaction: Strongly acid to moderately alkaline depending on the moisture content.

The lower Cg horizon
Hue: 2.5Y or 5Y moist and dry
Value: 3, 4 or 5 moist, 4, 5 or 6 dry
Chroma: 2 or 3, moist or dry
Redoximorphic features: Distinct or prominent fine to medium
Texture of the fine earth: stratified fine sandy loam, very fine sandy loam, silt loam, sandy clay loam or silty clay loam
Reaction: Strongly acid to moderately alkaline depending on the moisture content.

COMPETING SERIES:
Delway soils formed in brackish coastal marshes, are strongly saline and the electrical conductivity is more than 16 decisiemens per centiliter.
Mattan soils have moderate permeability in the organic material and have large pieces of woody fibrous materials (logs and limbs) in the organic.

GEOGRAPHIC SETTING: The Shinkee soils are in fresh water marshes and river channels of the San Joaquin - Sacramento Delta. Slopes are less than 2 percent. They formed in hydrophytic plant remains over mixed mineral alluvium. The organic material is derived from tule and reed fibers. Elevations are 15 feet below sea level to 5 feet above sea level and are on islands protected by levees. The climate is subhumid with hot dry summers and cool, moist winters. The mean annual precipitation varies from 12 to 16 inches. The mean January temperature is about 43 degrees F; mean July temperature is about 73 degrees F; mean annual temperature is about 60 degrees F. Frost-free period ranges from 260 to 300 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the similar Kingile, Rindge, Shima, Venice and Webile soils on a similar topography and the Dello, Egbert, Itano, Peltier, Ryde, Scribner and Valdez soils. The Dello, Itano and Valdez soils are on old river channels and Egbert, Peltier, Ryde and Scribner soils are on flood plains. Dello soils are sandy mineral soils. Egbert and Scribner are mineral soils with less than 10 percent weighted average organic matter content in the 10 to 40 inch zone. Egbert is fine and Scribner is fine-loamy. Itano and Valdez are mineral soils that have fine-silty control sections. Peltier and Ryde are mineral soils with 10 to 25 or 30 percent weight average organic matter content in the 10 to 40 inch zone. Peltier is fine and Ryde is fine-loamy.

DRAINAGE AND PERMEABILITY: Very poorly drained; very slow runoff; permeability is rapid in the organic layer and moderately slow in the mineral substratum. The water table is lowered by artificial drainage with open drains and pumps. It is usually maintained between 36 to 48 inches during the growing season.

USE AND VEGETATION: Used for cropland to grow field crops, vegetables and other specialty crops. Vegetation in uncultivated areas is sedges and tules.

DISTRIBUTION AND EXTENT: The islands of the San Joaquin - Sacramento Delta, California. The soils are not extensive in MLRA-16.

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

SERIES ESTABLISHED: San Joaquin County Area, California, 1990.

REMARKS: The classification was updated in February 2001 using the Eighth Edition to Soil Taxonomy and again in 2016 using the Twelfth Edition to Soil Taxonomy. This series was formerly classified as loamy, mixed, euic, thermic, Terric Medisaprists.

Diagnostic horizons and features recognized in this pedon are:

Histic epipedon - the zone from 0 to 22 inches (Oap, Oa); sapric material

ADDITIONAL DATA: This soil was laboratory sampled as 13N3989 (S2012CA077003).

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National Cooperative Soil Survey
U.S.A.