LOCATION SHANGHAI CAEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, nonacid, thermic Aquic Xerofluvents
TYPICAL PEDON: Shanghai silt loam - on a nearly level slope of less than l percent in an irrigated prune orchard at 30 feet elevation. (Colors are for dry soil unless otherwise stated. When described on April 9, 1979, the soil was moist throughout.)
Ap--0 to 11 inches; very pale brown (10YR 7/4) silt loam, brown (10YR 4/3) moist; common medium distinct yellowish brown (10YR 5/6) mottles, yellowish brown (10YR 5/8) moist; moderate very fine subangular blocky structure; slightly hard, friable, slightly sticky and plastic; common very fine roots; common very fine tubular pores; neutral (pH 7.0); clear smooth boundary. (7 to 14 inches thick)
A--11 to 21 inches; very pale brown (10YR 7/3) silt loam, brown (10YR 4/3) moist;common large distinct strong brown (7.5YR 5/6) mottles, dark yellowish brown (10YR 4/6) moist; massive; slightly hard, friable, slightly sticky and plastic; common very fine roots; common very fine tubular pores; neutral (pH 7.0); gradual wavy boundary. (3 to 10 inches thick)
C1--21 to 27 inches; pale brown (10YR 6/3) silt loam, yellowish brown (10YR 5/4) moist; many medium prominent yellowish brown (10YR 5/8) and many large prominent strong brown (7.5YR 4/6) mottles, dark yellowish brown (10YR 3/6) and dark reddish brown (2.5YR 3/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; common very fine and few fine roots; common very fine tubular pores; neutral (pH 7.0); gradual wavy boundary. (6 to 18 inches thick)
C2--27 to 36 inches; pale brown (10YR 6/3) silt loam, dark yellowish brown (10YR 4/4) moist; many medium prominent yellowish brown (10YR 5/8) and many large prominent strong brown (7.5YR 4/6) mottles, dark yellowish brown (10YR 3/6) and dark reddish brown (2.5YR 3/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; common very fine roots; very fine tubular pores; neutral (pH 7.0); gradual wavy boundary. (9 to 16 inches thick)
C3--36 to 54 inches; very pale brown (10YR 7/3) silt loam, dark yellowish brown (10YR 4/4) moist; common medium distinct strong brown (7.5YR 5/8) mottles, dark brown (7.5YR 4/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; common very fine tubular pores; neutral (pH 7.0); gradual wavy boundary. (8 to 18 inches thick)
C4--54 to 62 inches; pale brown (10YR 6/3) silt loam, dark brown (10YR 3/3) moist; many medium distinct yellowish red (5YR 5/8) mottles; massive; soft, friable, slightly sticky and slightly plastic; few very fine roots; common very fine pores; neutral (pH 7.0).
TYPE LOCATION: Sutter County, California; approximately 1.2 miles north of Yuba City on Live Oak Highway, then east on Rednall Road to levee; 2,000 feet north and 900 feet east of the intersection of Rednall Road and the western levee of the Feather River, approximately 800 feet from river, in the New Helvetia land grant T.15 N., R.3 E. Yuba City Quadrangle.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 60 degrees to 65 degrees F. The soil temperature is above 47 degrees F. the entire year. The soil between depths of 6 and 18 inches is dry in all parts from June through October and is moist in some or all parts from November through May unless irrigated. The difference between average July and average January soil temperature is 30 degrees to 33 degrees F.
The 10 to 40 inches control section is stratified layers of silt loam to fine sandy loam and silty clay loam, but is dominantly silt loam with less than 15 percent coarser than very fine sand. Clay content ranges from 20 to 35 percent. Content of organic matter decreases irregularly with depth. Reaction is slightly acid to moderately alkaline.
The A horizon has dry color of 10YR 7/4, 7/3, 6/4, 6/3, 5/4; 2.5Y 6/2 or 7/2 and moist color of 10YR 4/4, 4/3; 2.5Y 4/2, 3/2 or 3/3 with mottled colors dry and moist of 10YR 4/6, 5/6, 5/8; 7.5YR 5/6, 7/6 and 5YR 6/8. It is silty clay loam, silt loam or fine sandy loam.
The C horizon has dry colors of 10YR 8/4, 7/4, 6/4, 8/3, 7/3, 6/3; 2.5Y 6/2 or 7/2 and moist color of 10YR 6/6, 6/4, 6/3, 5/6, 5/3, 3/3, 5/4, 4/4; 2.5Y 5/2, 4/2, or 5Y 6/3 with prominent or distinct mottles. Some pedons have a clay layer at 40 to 60 inches.
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Shanghai soils are on flood plains with slopes of 0 to 2 percent. They formed in alluvium from mixed sources. Elevations are 20 to 150 feet. The climate has hot dry summers and cool moist winters. Mean annual precipitation is 14 to 22 inches. Average January temperature is about 45 degrees F., the average July temperature is about 77 degrees F., and the mean annual temperature is 60 degrees to 64 degrees F. The frost-free season is about 260 to 290 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Columbia and Holillipah soils. Columbia soils are on similar flood plain positions. Holillipah soils are on similar but slightly higher flood plain positions in areas adjacent to rivers.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; runoff is very slow; permeability is moderate, but may be slow below 40 inches. Unless protected, these soils are subject to flooding. Unless drained, in low lying areas and areas adjacent to levees, a water table is present at a depth of 30 to 60 inches in December through April and below a depth of 48 inches in May to November. In other areas, the water table is at 36 to 60 inches in December through April.
USE AND VEGETATION: This soil is used for irrigated orchards, small grains and row crops.
DISTRIBUTION AND EXTENT: Southeastern part of Sacramento Valley. Soils are moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Sutter County, California 1984.
REMARKS: The activity class was added to the classification in February of 2003. Competing series were not checked at that time. - ET
Last revised by the state on 2/91.