LOCATION SOGN               KS NE OK

Established Series
Rev. SAS, JCR
03/2006

SOGN SERIES

The Sogn series consists of shallow and very shallow, somewhat excessively drained, soils that formed in residuum weathered from limestone. Sogn soils are on uplands. Slopes range from 0 to 20 percent. Mean annual precipitation is about 81 centimeters (32 inches), and mean annual temperature is about 13 degrees C. (55 degrees F.) at the type location.

TAXONOMIC CLASS: Loamy, mixed, superactive, mesic Lithic Haplustolls

TYPICAL PEDON: Sogn silty clay loam - rangeland. (Colors are for dry soil unless otherwise stated.)

A--0 to 23 centimeters (0 to 9 inches); very dark gray (10YR 3/1) silty clay loam, black (10YR 2/1) moist; moderate medium granular structure; hard, friable; few fragments of weathered limestone in lower 3 inches comprise less than 15 percent of the soil volume; strong effervescence; moderately alkaline; abrupt smooth boundary. (10 to 51 centimeters (4 to 20 inches) thick)

R--23 centimeters (9 inches); level-bedded indurated limestone that has joints averaging about 46 centimeters (18 inches) apart and less than 1 centimeters (1/4 inch) wide, cracks are filled with dark colored soil.

TYPE LOCATION: Geary County, Kansas; about 16 kilometers (10 miles) east and 1.6 kilometers (1 mile) south of Junction City, 91 centimeters (300 feet) east and 15 (50 feet) south of the northwest corner, sec. 15, T. 12 S., R. 7 E.

RANGE IN CHARACTERISTICS:
Soil moisture control section: Ustic bordering on Udic
Lithic contact: 10 to 51 centimeters (4 to 20 inches) to limestone bedrock
Thickness of the mollic epipedon: 10 to 51 centimeters (4 to 20 inches)
Some pedons do not contain free carbonates above the bedrock.
Particle-size control section (weighted average):
Clay content: 20 to 35 percent
Sand content: 2 to 35 percent
Rock fragments:
Content: Less than 35 percent
Size: Pebbles, channers
Kind: Limestone

A horizon:
Hue: 7.5YR to 2.5Y
Value: 3 to 5, 2 or 3 moist
Chroma: 1 to 3, or moist
Texture: Silty clay loam, loam, silt loam and clay loam
Clay content: 20 to 35 percent
Rock fragments: Less than 35 percent
Reaction: Slightly acid to moderately alkaline

Some pedons have an AC or C horizon with colors like the A horizon and texture of channery silt loam or channery silty clay loam.

COMPETING SERIES: These are the Altezita, Apache, Bluemound, Dalerose, Hedville, Purner, Santana and Venezia soil.
Altezita soils have less than 20 percent clay in the particle-size control section.
Apache soils: are dryer in the soil moisture control section and are derived from residuum weathered from basalt, small amounts of eolian material, and other volcanic debris
Bluemound soils formed in 25 to 51 centimeters (10 to 20 inches) of loess overlying Sioux quartzite bedrock.
Dalerose soils: averages 5 to 18 percent clay in the particle size control section.
Hedville soils are underlain by sandstone and contain less than 18 percent clay.
Purmer soils: have hue of 2.5YR or 5YR.
Santana soils: contain fragments of granite in the series control section. Venezia soils: do not contain secondary carbonates, and receive winter precipitation.

GEOGRAPHIC SETTING:
Parent material: Residuum derived from Limestone bedrock
Landform: Uplands
Slopes: 0 to 20 percent
Mean annual temperature: 7 to 14 degrees C. (45 to 57 degrees F.)
Mean annual precipitation: 74 to 97 centimeters (29 to 38 inches)
Frost-free period: 165 to 190 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Clime, Florence, Irwin, Kipson, Labette, Martin, Oska, Tully and Vinland soils.
Clime, Florence, Irwin, Labette, Martin, Oska, and Tully soils have fine textures and are more than 51 centimeters (20 inches) to bedrock.
Florence, Irwin, Labette, and Oska soils are generally on slightly higher positions than the Sogn soils.
Clime, Kipson, Martin, Tully, and Vinland soils generally are on slopes below the Sogn soils.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage: Somewhat excessive
Runoff: Medium or high
Saturated Hydraulic Conductivity: Moderately high

USE AND VEGETATION: Almost all areas are used for rangeland.
Native vegetation is midgrass prairie.
Sideoats grama, big bluestem, and little bluestem are dominant.

DISTRIBUTION AND EXTENT: Mostly in eastern Kansas, and widely spaced small areas are in western Missouri, eastern Iowa and Nebraska, northwestern Illinois, southeastern South Dakota, southern Minnesota, and southwestern Wisconsin. The Sogn series is extensive.

MLRA OFFICE RESPONSIBLE: Salina, Kansas

SERIES ESTABLISHED: Goodhue County, Minnesota; 1913.

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: 0 to 23 centimeters (0 to 9 inches) (A horizons)
Mollic epipedon: 0 to 23 centimeters (0 to 9 inches) (A horizons)
Lithic contact: limestone bedrock at 23 centimeters (9 inches) (R horizons)

lrr=m
date: 05/13/99 SAG
expanded slope range due to the Gage County, Nebraska update
Date: 5/00 JCR
Changed format of OSD to semi-tabular from narrative
Changed runoff from medium to rapid to medium to high
Added Soil Interpretation Record sand content to "Range In Characteristics" and frost-free period to Geographic setting.

Modified format by LRM in 3/2006 to include metric conversion and change permeability to saturated hydraulic conductivity.

National Cooperative Soil Survey
U.S.A.