LOCATION KINGILE CAEstablished Series
TAXONOMIC CLASS: Clayey, mixed, euic, thermic Terric Haplosaprists
TYPICAL PEDON: Kingile muck - on an east facing slope of less than 1 percent in a cultivated asparagus field at 6 feet below sea level. (Colors are for moist soil unless otherwise stated. The pH for organic layers is in 0.01 Calcium chloride. (When described on September 28, 1972 the soil was moist throughout.)
Oap--0 to 12 inches; black (10YR 2/1) muck, black (10YR 2/1) rubbed, dark gray (10YR 4/1) dry; less than 5 percent fibers, none observable rubbed; moderate very fine and fine granular structure; slightly hard, slightly sticky and slightly plastic; strongly acid (pH 5.1); abrupt smooth boundary. (7 to 12 inches thick)
Oa--12 to 17 inches; black (10YR 2/1) variegated with yellowish brown (10YR 5/4) muck, black (10YR 2/1) rubbed, very dark brown (10YR 2/2) dry; 10 to 20 percent fibers, less than 5 percent rubbed; massive; soft, slightly sticky and slightly plastic; strongly acid (pH 5.1); clear smooth boundary. (5 to 24 inches thick)
2C1--17 to 25 inches; very dark grayish brown (2.5Y 3/2) silty clay with bands of yellowish red (5YR 4/6); massive; hard, firm, sticky and plastic; moderately acid (pH 6.0); clear smooth boundary. (5 to 10 inches thick)
2C2--25 to 36 inches; very dark grayish brown (2.5Y 3/2) silty clay loam, variegated yellowish brown (10YR 5/6), dark reddish brown (5YR 3/2) moist; massive; hard, firm, sticky and plastic; moderately acid (pH 6.0); abrupt smooth boundary. (6 to 11 inches thick)
2C3--36 to 61 inches; dark gray (N 4/0) silty clay with bands of yellowish brown (10YR 5/6) and dark reddish brown (5YR 3/2); massive; hard, firm, sticky and plastic; slightly alkaline (pH 7.7)
TYPE LOCATION: San Joaquin County, California; on King Island, 200 feet N of Eight Mile Road and 3,400 feet E of the intersection of Atherton Road and Eight Mile Road intersection; 38 degrees 03 minutes 37 seconds N latitude and 121 degrees 26 minutes 44 seconds W longitude on unsectionized area. Terminous quad.
RANGE IN CHARACTERISTICS: Depth to mineral layer ranges from 16 to 36 inches. The mean annual soil temperature is 62 degrees F. The organic portion of the 0 to 36 inch sections has 30 to 65 percent organic matter by combustion method but usually is 35 to 45 percent. It has 2 to 40 percent fibers before rubbing and 0 to 10 percent after rubbing. The mineral portion of the control section has 20 to 50 percent clay.
The Oap horizon is 10YR 2/1, 3/1, 3/2, or 2/2. It has 35 to 45 percent organic matter and from a trace to 5 percent fibers before rubbing. The minimal fraction is clayey with more than 55 percent by weight. Reaction is very strongly acid to moderately acid (pH 4.6 to 5.6 in calcium chloride).
The Oa is 10YR 2/1, 2/2; N 2/0 with 10YR 5/4 vegetative fibers. It has 40 to 65 percent organic matter. This layer has 5 to 20 percent fibers before rubbing and 0 to 10 percent fibers after rubbing. It is very strongly acid to slightly acid. The mineral fraction averages clayey and has 25 to 55 percent clay by weight.
The 2C horizon is 2.5Y 3/2, 3/1; 10YR 3/1, 4/1; N 4/0. They are mottled, have variegated color patterns and may have a chroma of 1 or less. They are silty clay loam to clay. Lenses of highly organic mineral material less than 5 cm thick are present at depths of 16 to 36 inches in some pedons.
COMPETING SERIES: These are the Lanexa and Webile soils. Lanexa soil have thin lenses and strata of mineral soil material in the control section, moderate permeability in the organic layer and salinity in the upper part of the profile. Webile soils have fine textured mineral soils at depths of 36 to 51 inches.
GEOGRAPHIC SETTING: The Kingile soils formed from hydrophytic plant remains and mixed mineral alluvium in fresh water marshes, deltas, and old river channels. Slopes are 0 to 2 percent. Elevations are 5 feet above to 15 feet below 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 is 12 to 16 inches. Mean January temperature is 45 degrees F.; mean July temperature is 75 degrees F.; mean annual temperature varies from 59 to 62 degrees F. Frost-free season ranges from 260 to 300 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Rindge, Shima and Venice soils with similar topography. Rindge soils have continuous sapric soil materials to depths more than 51 inches. Shima soils have sandy mineral material at depths of 17 to 36 inches. Venice soils have continuous hemic soil material to 51 inches or more.
DRAINAGE AND PERMEABILITY: Very poorly drained; very slow runoff; rapid permeability in organic layers and slow in the mineral substratum. The water table is usually at depths of 36 to 48 inches during the growing season and at or near the surface at some time during the winter.
USE AND VEGETATION: Used for irrigated cropland to grow such crops as corn, barley, wheat, potatoes and asparagus. Native vegetation in uncultivated areas is sedges and tules.
DISTRIBUTION AND EXTENT: Kingile soils are in the islands of the Sacramento-San Joaquin Delta of California. This series is of moderate extent in MLRA-16.
MLRA OFFICE RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Contra Costa County, California 1973.
REMARKS: The classification was updated in February 2001 using the Eighth Edition to Soil Taxonomy. This series was formerly classified as clayey, mixed, euic, thermic Terric Medisaprists. Competing series were not checked at that time.
Diagnostic horizons and features recognized in this pedon are:
Histic epipedon - 0 to 17 inches (0ap, Oa); sapric material