LOCATION WOODSON            KS+MO OK

WOODSON SERIES

TAXONOMIC CLASS: Fine, smectitic, thermic Abruptic Argiaquolls

TYPICAL PEDON: Woodson silt loam - on a nearly level area in native grass. (Colors are for moist soil unless otherwise stated.)

A--0 to 20 centimeters (0 to 8 inches); very dark gray (l0YR 3/l) silt loam, gray (l0YR 5/l) dry; weak fine granular structure; slightly hard, friable; many roots; moderately acid; abrupt smooth boundary. (18 to 36 centimeters (7 to l4 inches thick)

Bt1--20 to 48 centimeters (8 to l9 inches); very dark gray (l0YR 3/l) silty clay, dark gray (l0YR 4/l) dry; few fine faint dark brown (l0YR 3/3) mottles; moderate fine blocky structure; extremely hard, very firm; common roots; moderately acid; gradual smooth boundary.

Bt2--48 to 79 centimeters (l9 to 3l inches); very dark gray (l0YR 3/l) silty clay, gray (l0YR 5/l) dry; many medium distinct strong brown (7.5YR 5/6) and a few medium distinct olive brown (2.5Y 4/4) mottles; moderate fine and medium blocky structure; extremely hard, very firm; fine and medium concretions; moderately acid; gradual smooth boundary. (Combined thickness of the Bt horizon is 41 to 89 centimeters (l6 to 35 inches.)

BC--79 to 97 centimeters (3l to 38 inches); gray (l0YR 5/l) silty clay, gray (l0YR 6/l) dry; few medium distinct dark reddish brown (5YR 3/4) mottles; weak medium blocky structure; extremely hard, very firm; few roots; few fine black concretions; common fine gypsum particles; moderately acid; diffuse wavy boundary. (15 to 51 centimeters (6 to 20 inches thick)

C--97 to 152 centimeters (38 to 60 inches); gray (l0YR 5/l) silty clay, gray (l0YR 6/l) dry; many fine distinct olive (5Y 4/4) mottles; moderate fine and very fine blocky structure; extremely hard, very firm; very few roots; common fine black concretions; common black stains; few fine gypsum particles; moderately acid.

TYPE LOCATION: Allen County, Kansas; 4 miles south of LaHarpe, Kansas; 31 meters (l00 feet) south and 433 meters (l,420 feet) east of the northwest corner of sec. 23, T. 25 S., R. l9 E.

RANGE IN CHARACTERISTICS:
Thickness of the solum: 76 to 152 centimeters (30 to 60 inches)
Mollic epipedon: 18 to 36 centimeters (7 to 14 inches)
Particle control section (weighted average):
Clay content: 40 to 60 percent
Sand content: 1 to 10 percent

A horizon:
Hue: l0YR
Value: 2 or 3 and 3 to 5 dry
Chroma: l or less
Texture: silt loam or silty clay loam
Reaction: moderately acid or slightly acid

Bt horizon (upper portion):
Hue: l0YR or 2.5Y
Value: 2 or 3 and 3 to 5 dry
Chroma: l.5 or less
In some pedons the faces of peds are coated with grayish silt grains in the upper part.
Texture: silty clay or clay
Reaction: moderately acid to neutral

Bt horizon (lower portion):
Hue: l0YR to 5Y
Value: 3 or 5 and 4 to 6 dry
Chroma: l.5 or less
In some pedons the faces of peds are coated with grayish silt grains in the upper part.
Redoximorphic features: range from few to many, and are distinct in contrast
Texture: silty clay or clay
Reaction: moderately acid to neutral

C horizon:
Hue: l0YR to 5Y
Value: 4 to 6 and 5 to 7 dry
Chroma: l to 3
Redoximorphic features: range from few to many, and are distinct in contrast
Texture: silty clay loam, silty clay or clay
Reaction: moderately acid to mildly alkaline

COMPETING SERIES: There are no competing series.

GEOGRAPHIC SETTING:
Landform: upland divides and stream terraces
Slope: 0 to 3 percent
Parent material: formed in sediments high in silt and clay. The sediments are presumed to be old alluvium but may contain loess in the upper part and grade into residuum from shale in the lower part
Mean annual temperature varies from 14 to 18 degrees C (57 to 65 degrees F)
Mean annual precipitation varies from 89 to 107 centimeters (35 to 42 inches)
Thornthwaites Annual P-E Index ranges from 64 to 78.

GEOGRAPHICALLY ASSOCIATED SOILS: These are Bates, Dennis, Catoosa, Kenoma, Leanna, and Lula soils.
The better drained Bates, Dennis, and Kenoma soils are usually on more sloping topography.
Catoosa and Lula soils are also better drained and are common on nearby areas with similar slopes underlain by limestone.
Leanna soils have albic horizons and are on flood plains and low terraces.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage: Somewhat poorly drained
Runoff: slow or medium
Saturated hydraulic conductivity: very low.

USE AND VEGETATION: About three-fourths is used as cropland and one-fourth is used as grassland.
Native vegetation is dominated by tall grass species.
Common cultivated crops are soybeans, grain sorghums, wheat, corn, and alfalfa.

DISTRIBUTION AND EXTENT: Southeast Kansas, southwestern Missouri and northeastern Oklahoma. The series is extensive.

MLRA OFFICE RESPONSIBLE: Salina, Kansas

SERIES ESTABLISHED: Neosho County, Kansas, l930.

REMARKS: The Woodson series was formerly classified in the mixed mineralogy class.

Additional Data: The Woodson pedon (73Ll099-73Lll09) sampled by the National Soil Survey Laboratory is from the same general area as the typical pedon described here.