LOCATION YUVAS CAEstablished Series
TAXONOMIC CLASS: Fine, mixed, active, thermic Abruptic Durixeralfs
TYPICAL PEDON: Yuvas loam - on a basin rim of about 1 percent slope under a harvested field of irrigated rice at 34 feet elevation. (Colors are for dry soil unless otherwise stated. When described on April 10, 1979, the soil was dry to 2 inches and moist below.)
Ap--0 to 5 inches; light yellowish brown (10YR 6/4) loam, dark yellowish brown (10YR 3/4) moist; few medium distinct reddish yellow (7.5YR 6/8) mottles, strong brown (7.5YR 5/8) moist; weak coarse subangular blocky structure; hard, friable, sticky and plastic; common very fine roots; common very fine and fine tubular pores; common fine and medium manganese concretions; moderately acid (pH 6.0); gradual wavy boundary. (5 to 12 inches thick)
A1--5 to 10 inches; pale brown (10YR 6/3) loam, brown (10YR 4/3) moist; few medium distinct reddish yellow (7.5YR 7/8) mottles, red (2.5YR 4/8) moist; weak coarse subangular blocky structure; hard, friable, sticky and plastic; common very fine roots; common very fine and fine tubular pores; common fine and medium manganese concretions; moderately acid (pH 6.0); gradual wavy boundary. (5 to 8 inches thick)
A2--10 to 16 inches; light yellowish brown (10YR 6/4) loam, brown (7.5YR 4/4) moist; weak coarse subangular blocky structure; hard, firm, sticky and plastic; common very fine roots; common very fine tubular pores; common fine and medium manganese concretions; moderately alkaline (pH 8.0); abrupt irregular boundary. (4 to 8 inches thick)
Bt--16 to 24 inches; pink (7.5YR 8/4) clay, yellowish red (5YR 4/6) moist; moderate coarse angular blocky structure; very hard, firm, very sticky and plastic; few very fine tubular pores; common fine manganese concretions and stains; common pressure faces; moderately alkaline (pH 8.0); abrupt smooth boundary. (6 to 12 inches thick)
2Ckqm--24 to 38 inches; very pale brown (10YR 7/4) duripan, reddish yellow (7.5YR 6/6) moist; massive; continuously indurated by 1 cm laminar silica cap; strongly effervescent with laminar capping of lime; common manganese and iron stains in seams below capping; moderately alkaline (pH 8.0); abrupt smooth boundary. (2 to 16 inches thick)
3Cr--38 to 60 inches; light gray (10YR 7/2) weakly consolidated siltstone. Slakes in water.
TYPE LOCATION: Sutter County, California; approximately 3.2 miles south of Tudor on U.S. Highway 99, then 0.6 miles west on farm road adjacent to Wilson School, then 300 feet north into rice field; 300 feet north and 200 feet west of the southeast corner Section 15, T. 13 N., R. 3 E.
RANGE IN CHARACTERISTICS: Depth to duripan ranges from 20 to 40 inches. Depth to siltstone ranges from 22 to 40 inches. The mean annual soil temperature is 60 degrees to 65 degrees F. The soil temperature is above 47 degrees F. the entire year. The difference between mean summer and mean winter soil temperature is 30 degrees to 33 degrees F. The soil between depths of 6 and 18 inches is usually dry in all parts from June through October and is moist in some or all parts from November through May.
The A horizon has dry color of 10YR 6/3 or 6/4, and moist color of 10YR 3/2, 3/3 or 3/4. It is moderately acid to neutral. Clay content ranges from 18 to 27 percent.
The Bt horizon has dry color of 7.5YR 8/4, 6/4 or 5/6 and moist color of 7.5YR 4/3, 4/4; 5YR 4/6 or 3/3. It is mildly alkaline or moderately alkaline. Clay content ranges from 40 to 60 percent. The transition between the A and Bt horizon is abrupt with greater than 15 percent (absolute) more clay in the upper 1 inch of the Bt horizon than in an A horizon.
The duripan has dry color of 10YR 7/4, 7/6 or 4/4. It is continuously indurated with a 1 to 5 mm laminar silica cap, and has laminar accumulations of CaC03 above it.
COMPETING SERIES: This is the San Joaquin series and the Chesterton, Gloria, Moda, and Redding series in other families. Chesterton and Redding soils have koalinitic mineralogy. Gloria soils have illitic mineralogy. Moda soils have vermiculitic mineralogy. San Joaquin soils lack bedrock at 22 to 40 inches.
GEOGRAPHIC SETTING: Yuvas soils are on old remnant terraces and basin rims. Slopes are 0 to 2 percent. The soils formed in alluvium from mixed sources desposited over unrelated siltstone. Elevations are 20 to 80 feet. Climate is subhumid with hot dry summers and cool moist winters. Mean annual precipitation is 17 to 20 inches. Mean January temperature is 77 degrees F; mean July temperature is 45 degrees F.; and mean annual temperature is 60 degrees to 64 degrees F. Frost-free season is 260 to 280 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Capay, Gridley, Marcum, and Oswald soils. Capay and Oswald soils are in basins and have clay textures throughout. Gridley soils are on terraces and have a mollic epipedon. Marcum soils are 40 to 60 inches to a paralithic contact.
DRAINAGE AND PERMEABILITY: Moderately well drained; very slow to slow runoff; moderate over very slow permeability. Some areas of this soil are subject to frequent, brief to long periods of flooding in December through April. A perched water table is at a depth of 18 to 36 inches in December through April.
USE AND VEGETATION: This soil is used for irrigated small grains, row crops and irrigated orchards, mainly prunes.
DISTRIBUTION AND EXTENT: Southeastern part of the Sacramento Valley. Soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Sutter County, California 1983. Series name is coined.
REMARKS: The activity class was added to the classification in January of 2003. Competing series were not checked at that time. - ET
OSED scanned by SSQA. Last revised by state on 2/84.