LOCATION GADDY OK+TXEstablished Series
TAXONOMIC CLASS: Sandy, mixed, thermic Udic Ustifluvents
TYPICAL PEDON: Gaddy loamy fine sand, cultivated. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 8 inches; brown (7.5YR 5/4) loamy fine sand, brown (7.5YR 4/4) moist; weak fine granular structure; slightly hard, very friable; calcareous; moderately alkaline; clear smooth boundary. (7 to 20 inches thick)
C1--8 to 20 inches; light brown (7.5YR 6/4) loamy fine sand, brown (7.5YR 5/4) moist; single grained; soft; common thin stratas of brown (7.5YR 4/4) fine sandy loam; calcareous; moderately alkaline; gradual smooth boundary. (0 to 15 inches thick)
C2--20 to 60 inches; very pale brown (10YR 7/3) fine sand, pale brown (10YR 6/3) moist; single grained; loose; common thin stratas of brown (10YR 5/3) loamy fine sand and fine sandy loam; calcareous; moderately alkaline.
TYPE LOCATION: Pottawatomie County, Oklahoma; about 2 miles east and 1 mile south of Shawnee; about 2,100 feet west and 200 feet south of the northeast corner of sec. 28, T. 10 N., R. 4 E.
RANGE IN CHARACTERISTICS: These soils are moderately alkaline and calcareous throughout the 10- to 40-inch control section. In some pedons, the upper 10 inches is noncalcareous and slightly alkaline.
The Ap or A horizon has hue of 5YR or 10YR, value of 4 to 6, and chroma of 2 to 6. Where the moist color value and chroma are less than 3.5, the thickness is less than 10 inches or the organic matter content is less than 1 percent. The upper 10 inches of the Ap or A horizon ranges from fine sand to loam and below 10 inches the Ap or A horizon is loamy fine sand or fine sand.
The C horizon has hue of 5YR to 10YR, value of 4 to 8, and chroma of 3 to 6. Texture is loamy fine sand or fine sand and is stratified with thin strata of fine sandy loam to clay loam. The thin strata are less than 1 inch thick, are darker in color, and contain more organic matter than the matrix.
COMPETING SERIES: This is the Gad series in the same family. Similar soils are the Lincoln and Yahola series. Gad soils have mean annual soil temperatures of 65 to 70 degrees F. Lincoln soils are dry in the soil moisture control section for longer periods of time. Yahola soils have a coarse-loamy textural control section.
GEOGRAPHIC SETTING: Gaddy soils are on nearly level or very gently sloping flood plains in the Central Rolling Red Prairies. Slopes are 0 to 3 percent. They formed in sandy alluvium of Recent age. Mean Annual Precipitation: 26 to 38 inches. Mean Annual Soil Temperature: 57 to 63 degrees F. Thornthwaite Annual P-E indices: 44 to 64. Frost free days range from 200 to 230. Elevation ranges from 700 to 1500 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Gracemore (OK), Yahola (OK), Keokuk (OK), and the Lomill (OK) series. Gracemore soils occur in slightly concave areas nearest the stream channel. Keokuk soils have a coarse-silty control section, a mollic epipedon, and occur on higher flood plains. Lomill soils have a clayey over loamy control section, a mollic epipedon, cracks that extend to depths of 20 inches or more, and a COLE of 0.07 or more and are on higher flood plains. Yahola soils usually occur farther from the stream channel and on slightly higher elevation.
DRAINAGE AND PERMEABILITY: Gaddy soils are somewhat excessively drained. Runoff is negligible and permeability is moderately rapid or rapid. These soils are subject to flooding for very brief periods mainly during March to October.
USE AND VEGETATION: Used mostly for tame pasture. Some areas are used for wheat, alfalfa, grain sorghum, and peanuts. Native vegetation is mostly eastern cottonwood, American elm, green ash, and pecan with an understory of sand bluestem, little bluestem, switchgrass, and Indiangrass.
DISTRIBUTION AND EXTENT: Central Rolling Red Prairies (MLRA-80A) of Oklahoma and Texas. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Pottawatomie County, Oklahoma; 1974.
REMARKS: Soil Interpretation Record: Series OK0034
Rarely Flooded OK0361
These soils were formerly included in Lincoln series. Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from the surface of the soil to a depth of 8 inches.
Fluventic feature - An irregular decrease in organic-carbon content from a depth of 25 cm to a depth of 125.
Moisture Regime- Udic Ustic.