LOCATION COYOTECREEK CA

Established Series
Rev. AJT-WBS-DJE-MAV-ET
12/2022

COYOTECREEK SERIES

The Coyotecreek series consists of very deep, well drained soils on narrow high flood plains. These soils formed in alluvium derived from mixed rock sources. Slope ranges from 0 to 2 percent. Mean annual precipitation is about l8 inches and the mean annual temperature is about 61 degrees F.

TAXONOMIC CLASS: Fine-silty, mixed, superactive, thermic Cumulic Haploxerolls

TYPICAL PEDON: Coyotecreek silt loam - in an area with a slope of less than l percent under a cover of annual grasses and forbs at about 100 feet elevation. (When described on January 29, 1985, the soil was moist throughout. Colors are for dry soil unless otherwise noted).

Ap--0 to 15 inches; dark brown (10YR 3/3) silt loam, very dark brown (10YR 2/2) moist; moderate coarse subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine roots; common very fine interstitial pores; slightly acid (pH 6.3); gradual wavy boundary.

A--15 to 35 inches; dark brown (10YR 3/3) loam, very dark grayish brown (10YR 3/2) moist; weak coarse subangular blocky structure; hard, friable, slightly sticky and slightly plastic; few very fine roots; common very fine interstitial and few very fine tubular pores; slightly acid (pH 6.3); gradual wavy boundary. (combined thickness of A horizons is 20 to 46 inches)

AC--35 to 58 inches; brown (10YR 4/3) loam, very dark grayish brown (10YR 3/2) moist; massive; very hard, firm, slightly sticky and slightly plastic; common very fine interstitial pores; neutral (pH 6.8); gradual wavy boundary. (15 to 30 inches thick)

C--58 to 65 inches; brown (10YR 5/3) clay loam, dark brown (10YR 3/3) moist; and dark yellowish brown (10YR 4/4) moist uncoated sand grains visible; massive; very hard, firm, sticky and slightly plastic; common very fine interstitial pores; neutral (pH 7.2).

TYPE LOCATION: Sacramento County, California; about 5 miles southeast of Mather Air Force Base, 1000 feet north and 550 feet west of the southeast corner section 25, T.8 N., R.7 E.; Buffalo Creek Quadrangle.

RANGE IN CHARACTERISTICS: The mean annual soil temperature at a depth of 20 inches is 64 to 67 degrees F. The soil between 5 and 16 inches is dry in most years from early June to mid-October and is moist in all or some part the remainder of the time. Weighted average clay content of the 10 to 40 inch control section is 18 to 27 percent with less than 15 percent fine sand or coarser material. This soil has weak stratification. Commonly, organic carbon content decreases regularly with depth and remains above 0.3 percent at 50 inches. The mollic epipedon is 20 to more than 40 inches thick and has 2 to 3 percent organic matter.

The Ap and A horizons are 10YR 3/3, 4/2, 4/3, 5/2 or 5/3. Moist color is 10YR 2/2, 3/2 or 3/3. Clay content is 18 to 27 percent and texture is loam or silt loam. Reaction is slightly acid to neutral.

The AC or C horizon, where present is 10YR 4/3, 5/3; 7.5YR 3/3, 4/4, 5/2 or 5/4. Moist color is 10YR 3/2, 3/3, 4/2, 4/4; 7.5YR 3/2, 3/4, or 4/4. It is fine sandy loam, loam, silt loam, silty clay loam or clay loam with 15 to 30 percent clay. Reaction is neutral to mildly alkaline.

COMPETING SERIES: There are no other soils in the family.

GEOGRAPHIC SETTING: Coyotecreek soils are on narrow high flood plains. Slopes are 0 to 2 percent and elevations range from 80 to 165 feet. The soils formed in alluvium derived from mixed rock sources. The climate is Mediterranean with hot dry summers and cool moist winters. Mean annual precipitation is 16 to 20 inches. Mean January temperature is 44 degrees F., mean July temperature is 77 degree F. and the mean annual temperature is 59 to 61 degrees F. The frost-free season is 230 to 275 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Hicksville, Reiff and Sailboat series. Hicksville soils have a fine-loamy argillic horizon and are on low stream terraces. Reiff and Sailboat soils have an ochric epipedon and are on low flood plains.

DRAINAGE AND PERMEABILITY: Well drained; slow runoff, moderately slow permeability. Occasionally flooded for very brief to brief periods in the winter and early spring months. A few areas are protected by levees.

USE AND VEGETATION: Used for irrigated crops such as tomatoes, corn, alfalfa, wheat and beans. Natural vegetation is annual grasses and forbs with scattered oaks.

DISTRIBUTION AND EXTENT: Sacramento Valley and lower San Joaquin Valley in California. This series is not extensive in MLRA-17.

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

SERIES ESTABLISHED: Sacramento County, California, 1987.

REMARKS: The activity class was added to the classification in February of 2003. Competing series were not checked at that time. - ET

Diagnostic horizons and features recognized in this pedon are:

Mollic epipedon - the zone from the surface to a depth of 35 inches. (Ap, A). Organic matter is assumed to be 1 percent more than the C horizon.

Cumulic Subgroup - Organic carbon content at 50 inches is assumed to be greater than 0.3 percent based on data from nearby similar soils.

Control section - The zone from 10 to 40 inches has weighted average clay content of 25.5 percent and ll percent fine sand and coarser material.

National Cooperative Soil Survey
U.S.A.