LOCATION KINGDON CAEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, thermic Typic Argixerolls
TYPICAL PEDON: Kingdon fine sandy loam on a less than 1 percent west facing slope at an elevation of 63 feet in a vineyard. (When described on March 26, 1984, the soil was moist throughout. Colors are for dry soil unless otherwise stated).
Ap1--0 to 5 inches; brown (10YR 5/3) fine sandy loam, very dark grayish brown (10YR 3/2) moist; moderate fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine roots; many very fine tubular and interstitial and common fine tubular pores; moderately acid (pH 5.6); abrupt wavy boundary. (4 to 10 inches thick)
Ap2--5 to 14 inches; grayish brown (10YR 5/2) fine sandy loam, very dark grayish brown (10YR 3/2) moist; weak coarse subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine, fine, medium and coarse roots; many very fine tubular and interstitial and common fine tubular pores; slightly acid (pH 6.1); clear wavy boundary. (6 to 10 inches thick)
BA--14 to 19 inches; brown (10YR 5/3) fine sandy loam, dark brown (10YR 3/3) moist; weak coarse angular blocky structure; hard, friable, slightly sticky and slightly plastic; few very fine, fine and medium roots; many very fine tubular and interstitial pores; slightly acid (pH 6.1); gradual wavy boundary. (0 to 10 inches thick)
Bt1--19 to 28 inches; pale brown (10YR 6/3) fine sandy loam, dark brown (10YR 4/3) moist; massive; very hard, friable, slightly sticky and slightly plastic; few very fine, fine, medium and coarse roots; many very fine tubular and interstitial pores; few thin clay films bridging mineral grains; neutral (pH 6.9) gradual wavy boundary. (6 to 10 inches thick)
Bt2--28 to 36 inches; pale brown (10YR 6/3) loam, brown (10YR 4/3) moist; massive; very hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine tubular and common very fine interstitial pores; common thin clay films bridging mineral grains and lining pores; neutral (pH 6.9); clear wavy boundary. (6 to 10 inches thick)
Bt3--36 to 42 inches; brown (10YR 5/3) fine sandy loam, brown (10YR 4/3) moist; massive; very hard, friable, slightly sticky and slightly plastic; few very fine, fine and medium roots; many very fine tubular and interstitial pores; few thin clay films bridging mineral grains and lining pores; neutral (pH 7.0); clear wavy boundary. (5 to 10 inches thick)
C1--42 to 51 inches; pale brown (10YR 6/3) fine sandy loam, brown (10YR 5/3) moist; massive; very hard, friable, slightly sticky and slightly plastic; few very fine and fine and common medium roots; many very fine tubular and interstitial pores; neutral (pH 7.1) clear wavy boundary. (6 to 15 inches thick)
C2--51 to 61 inches; light gray (10YR 7/2) sandy loam, brown (10YR 5/3) moist; massive; very hard, friable, slightly sticky and slightly plastic; few very fine, fine and medium roots; neutral (pH 7.2); clear wavy boundary. (6 to 15 inches thick)
TYPE LOCATION: San Joaquin County, California; about 1.6 miles northeast of Lodi; 1,875 feet south of Acampo Road and 1,350 feet west of Kennefick Road; on the westside of the farm road 60 feet north of a utility pole in the NE 1/4, SE 1/4, NE 1/4, section 30, T.4 N., R.7 E., MDBM, Lockeford quadrangle.
RANGE IN CHARACTERISTICS: The thickness of the solum is 30 to 60 inches. Organic matter is 1 to 3 percent in the surface and decreases regularly with depth to less than 1 percent at a depth of 15 to 20 inches. The moisture control section between a depth of 8 and 20 inches is dry throughout between June and October unless irrigated and moist throughout between mid-November and mid-April.
The A horizon is 10YR 5/3 or 5/2. Moist color is 10YR 3/3 or 3/2. It is predominantly slightly acid to neutral but the range includes moderately acid as a result of long term applications of sulfur for disease control. It is fine sandy loam or sandy loam.
The Bt horizon is 10YR 6/4, 6/3 or 5/3. Moist color is 10YR 4/4, 3/4, 4/3 or 3/3. Clay content in the textural control section is 15 to 18 percent but ranges up to 20 percent in the lower B horizons. It is sandy loam, fine sandy loam or loam.
The C horizon is 10YR 7/2, 6/4, 6/3, 6/2 or 5/3. Moist color is 10YR 5/4, 5/3, 4/4, 4/3 or 4/2. It is sandy loam, fine sandy loam or coarse sandy loam.
COMPETING SERIES: This is the Tretten (T) series. Tretten soils have a lithic contact at a depth of 20 to 40 inches.
GEOGRAPHIC SETTING: The Kingdon 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, San Joaquin, Tokay and Tujunga soils. Columbia soils do not have a mollic epipedon or an argillic horizon. San Joaquin soils have claypan subsoils over duripans and are moderately deep. Tokay soils do not have an argillic horizon. Tujunga soils have sandy textural control sections.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow runoff; moderate permeability.
USE AND VEGETATION: Used for irrigated row, field, tree and vine crops. Vegetation in uncultivated areas consists of annual grasses, forbs and scattered California White Oak.
DISTRIBUTION AND EXTENT: The Kingdon soils occur in the northern San Joaquin Valley. The series is of small extent in MLRA-17.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: San Joaquin County, California 1990. The source of the name is from the nearby Kingdon Road.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface to a depth of 14 inches (Ap1, Ap2)
Argillic horizon - the zone from 19 to 42 inches (Bt1, Bt2, Bt3)
The activity class was added to the classification in February of 2003. Competing series were not checked at that time. - ET