LOCATION RYDE CA

Established Series
Rev. MAM/WBS/ET
05/2016

RYDE SERIES

The Ryde series consists of very deep, very poorly drained soils formed in alluvium from mixed rock sources and decomposed vegetative matter. Ryde soils are on river deltas and have slopes of 0 to 2 percent. The mean annual precipitation is about 36 centimeters (14 inches) and the mean annual temperature is about 15.5 degrees C (60 degrees F).

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Cumulic Endoaquolls

TYPICAL PEDON: Ryde clay loam-on a 1 percent slope that is cultivated at 1.5 meters (5 feet) below sea level (Colors are for dry soil unless otherwise stated. When described on May 12, 1977, the soil was moist throughout).

Ap--0 to 20 centimeters (0 to 8 inches); grayish brown (10YR 5/2) clay loam, very dark grayish brown (10YR 3/2) moist; strong coarse granular structure; hard, friable, sticky and plastic; strongly acid (pH 5.5); clear smooth boundary. (20 to 30 centimeters (8 to 12 inches) thick)

A-- 20 to 61 centimeters (8 to 24 inches); dark gray (10YR 4/1) clay loam, very dark gray (10YR 3/1) moist; few fine prominent reddish yellow (7.5YR 6/6, 6/8), brown (7.5YR 4/4) and strong brown (7.5YR 4/6) redox concentrations moist; moderate coarse subangular blocky structure; extremely hard, firm, sticky and plastic; many fine roots; common fine tubular pores; strongly acid (pH 5.5); abrupt wavy boundary. (41 to 51 centimeters (16 to 20 inches) thick)

2Ab-- 61 to 81 centimeters (24 to 32 inches); very dark gray (10YR 3/1) mucky clay loam, black (10YR 2/1) moist; common fine distinct dark brown (7.5YR 3/4) and strong brown (7.5YR 4/6) redox concentrations moist; massive; slightly hard, firm, sticky and nonplastic; many fine roots; common very fine tubular pores; very strongly acid (pH 5.0); clear wavy boundary. (13 to 20 centimeters (5 to 8 inches) thick)

2Cg-- 81 to 160 centimeters (32 to 63 inches); very dark gray (N 3/0) and dark grayish brown (2.5Y 4/2) stratified silty clay loam and sapric material, black (N 2/0) and very dark grayish brown (2.5Y 3/2) moist; few fine prominent dark brown (7.5YR 3/4), brown (7.5YR 4/4) and strong brown (7.5YR 4/6) redox concentrations moist; massive; hard, firm, sticky and plastic; very strongly acid (pH 4.5).

TYPE LOCATION: San Joaquin County, California; about 4300 feet north and 5500 feet east of Tracy Road bridge on Middle River, Drexler Tract; 37 degrees 53minutes 41seconds north Latitude, 121 degrees 26 minutes 21 seconds west Longitude (in an unsectionized area) Holt quadrangle.

RANGE IN CHARACTERISTICS:
Mean annual soil temperature: 15 to 18 degrees C (60 to 65 degrees F)
Soil moisture: Soil between the depths of 20 to 43 centimeters (8 to 17 inches) is not dry at any time unless the soil has been artificially drained

Control Section -
Organic matter: averages 10 to 30 percent, horizons with 27 to 35 percent clay have less than 10 percent organic matter
Clay content: 27 to 35 percent
Redox features: distinct or prominent redox concentrations are present from a depth of 25 to 50 centimeters (10 to 20 inches) down to a depth of 100 centimeters (40 inches)
Other features: some stratification throughout with variation in the amount of organic matter in the various layers or horizons

A horizon:
Hue: 5 Y or 10YR dry and moist
Value: 4 or 5 dry and 2 or 3 moist
Chroma: 1 or 2 dry and moist
Texture of the fine earth: clay loam, silty clay loam, mucky clay loam or mucky silty clay loam
Reaction: strongly acid to neutral

2Ab horizon (where present):
Hue: N, 2.5 Y or 10YR dry and moist
Value: 3 or 4 dry and 2 or 3 moist
Chroma: 0, 1 or 2 dry and moist
Texture of the fine earth: mucky clay loam, mucky silty clay loam, mucky loam, or sapric material
Reaction: very strongly acid to moderately acid

2Cg horizon:
Hue: N, 2.5 Y or 10YR dry and moist
Value: 2, 3, 4, 5 or 7 dry and 2, 3 or 4 moist
Chroma: 0, 1 or 2 dry and moist
Texture of the fine earth: silty clay loam, loam or clay loam. Most pedons have lenses of mucky clay loam, mucky silty clay loam, sapric material or ash (burned peat) layers that range from 1 to 13 centimeters (1/2 inch to 5 inches) thick.
Reaction: very strongly acid to moderately acid, mineral horizons with low organic matter content are slightly acid to slightly alkaline
Additional Features: some pedons have textures of stratified fine sandy loam, sandy loam, loamy fine sand, loamy sand, sand, or sapric material below 100 centimeters (40 inches)

COMPETING SERIES: These are the Scribner and Sikeston series. Scribner soils are on slightly higher positions and have a weighted average of organic matter content of 1 to 10 percent in the 25 to 100 centimeter (10 to 40 inch) zone, and do not have stratified horizons with more than 10 percent organic matter. Sikeston soils have soil temperatures below 8 degrees C (47 degrees F) part of the year.

GEOGRAPHIC SETTING: The Ryde soils are on nearly level river deltas and flood plains. These soils formed in alluvium from mixed sources that contain hydrophytic plant remains. Elevations are 4.5 meters (15 feet) below sea level to 1.5 meters (5 feet) above sea level. Levees and pumps are required to control both surface and subsurface water. The climate is subhumid, mesothermal with hot dry summers and cool moist winters. Mean annual precipitation is 355 to 508 millimeters (14 to 20 inches). Mean annual January temperature is about 8 degrees C (47 degrees F); the mean July temperature is 24 degrees C (76 degrees F); and the mean annual temperature is about 15 to 16 degrees C (60 to 61 degrees F). The frost-free season is 260 to 280 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Scribner soils, and the Kingile, Rindge, Shima, Valdez and Venice soils. Kingile, Rindge, Shima and Venice are on lower positions and are all organic soils. Valdez soils are on slightly higher positions, are fine-silty and have an ochric epipedon. Scribner soils are on slightly higher positions and do not contain stratified organic horizons.

DRAINAGE AND PERMEABILITY: Very poorly drained; very slow runoff; moderately slow permeability. Some pedons with organic or sandy substratum have rapid permeability below 40 inches. The drainage of these soils has been altered by the use of levees and pumps. Water tables occur between 91 to 122 centimeters (36 and 48 inches) throughout the year. Flooding is rare due to protection by levees.

USE AND VEGETATION: Used mainly for irrigated cropland to produce crops such as wheat, alfalfa, irrigated pasture, sugar beets, tomatoes, field corn and safflower. Uncultivated areas have annual grasses and forbs, sedges and other hydrophytic plants.

DISTRIBUTION AND EXTENT: In the Sacramento-San Joaquin River Delta area of California. The soil is extensive in MLRA-16, and 17.

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

SERIES ESTABLISHED: San Joaquin County, (Lodi Area) California, 1932.

REMARKS: The type location has been moved from Solano County to San Joaquin County. This revision includes the characteristics of the Retryde series which is dropped.

Diagnostic horizons and features recognized in this pedon are:

Mollic epipedon - the zone from the surface to a depth of 61 centimeters (24 inches) (Ap,A).

Cumulic subgroup - mollic epipedon is 61 to 81 centimeters (24 to 32 inches) thick and has an irregular decrease of organic matter with increasing depth.

The base saturation of pedons with very strongly acid reactions needs to be checked. The mucky loam and mucky silt loam surface texture need to be checked to see if they are in the Histic subgroup.

Series reclassified 5/95. Competing series updated in 2016.

ADDITIONAL DATA: This soil was laboratory sampled as 14N0996 (S2014CA077001)

National Cooperative Soil Survey
U.S.A.