LOCATION NORGE OK+KS TXEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, active, thermic Udic Paleustolls
TYPICAL PEDON: Norge silt loam--cultivated. (Colors are for dry soil unless otherwise stated.)
A--0 to 12 inches; brown (7.5YR 4/2) silt loam, dark brown (7.5YR 3/2) moist; moderate fine granular structure; slightly hard, friable; many fine roots; moderately acid; gradual smooth boundary. (6 to 16 inches thick)
BA--12 to 18 inches; reddish brown (5YR 4/3) silty clay loam, dark reddish brown (5YR 3/3) moist; moderate medium granular structure; hard, friable; many fine roots; moderately acid; gradual smooth boundary. (0 to 10 inches thick)
Bt1--18 to 36 inches; reddish brown (5YR 5/4) silty clay loam, reddish brown (5YR 4/4) moist; moderate fine subangular blocky structure; very hard, firm; common fine roots; nearly continuous clay films on faces of peds; moderately acid; gradual smooth boundary. (9 to 25 inches thick)
Bt2--36 to 48 inches; red (2.5YR 5/6) silty clay loam, red (2.5YR 4/6) moist; moderate medium subangular blocky structure; very hard, firm; common fine roots; continuous clay films on faces of peds; slightly acid; gradual smooth boundary. (9 to 37 inches thick)
Bt3--48 to 66 inches; red (2.5YR 5/8) silty clay loam, red (2.5YR 4/8) moist; weak coarse subangular blocky structure; hard, firm; few fine roots; discontinuous clay films on faces of peds; slightly acid.
TYPE LOCATION: Pawnee County, Oklahoma; about 8 miles northeast of Pawnee; 725 feet east and 150 feet south of the northwest corner of sec. 9, T. 22 N., R. 6 E.
RANGE IN CHARACTERISTICS: Solum thickness is more than 60 inches. The mollic epipedon is less than 20 inches thick. Depth to secondary carbonates is more than 40 inches.
The A or Ap horizon has hue of 5YR to 10YR, value of 4 or 5, and chroma of 2 or 3. Texture is silt loam, loam, silty clay loam, or clay loam. Reaction ranges from moderately acid to neutral.
The BA horizon has hue of 5YR to 10YR, value of 4 or 5, and chroma of 2 to 4. Texture and reaction is the same as the A horizon.
The Bt1 and Bt2 horizons have hue of 2.5YR or 5YR, value of 4 or 5, and chroma of 4 to 6. Texture is silty clay loam or clay loam. Reaction ranges from moderately acid to slightly alkaline.
The Bt3 horizon has hue of 2.5YR or 5YR, value of 4 or 5, and chroma of 4 to 8. Some pedons have redoximorphic concentrations in shades of red or brown. Texture is clay loam, silty clay loam or silty clay. Reaction ranges from slightly acid to moderately alkaline.
Some pedons have a Bt4 horizon. Where present, the Bt4 horizon has hue of 2.5YR or 5YR, value of 4 to 6, and chroma of 4 to 8. Redoximorphic depletions and concentrations may be present in shades of gray, yellow, or brown. Texture is silty clay loam, clay loam or silty clay. Some pedons have texture of silt loam below 60 inches. Reaction ranges from slightly acid to slightly alkaline. Some pedons may have an accumulation of calcium carbonate (Btk horizon) in the lower 1/4 of the argillic.
Some pedons have a BC horizon below 60 inches. Where present, the BC horizon has color and texture similar to the Bt4 horizon. Reaction ranges from neutral to moderately alkaline.
COMPETING SERIES: There are no other series in the same family. Soils in similar families are Bethany, Chickasha, Dale, Grant, Justin, Kingfisher, Kirkland, Madge, Milan, Motley, Naron, Nashville, Navina, Ravia, Renfrow, Stoneburg, Teller, Vanoss, and Zaneis series. Bethany, Kirkland, and Renfrow soils have a fine control section. In addition, Bethany soils have a mollic epipedon more than 20 inches thick. Kirkland and Renfrow soils have a COLE of 0.07 or more in a horizon at least 20 inches thick. Chickasha, Madge, Milan, Naron, Navina, Ravia, Stoneburg, Teller, and Zaneis soils have a fine-loamy control section and decrease in clay content by more than 20 percent within 60 inches. Dale soils have a mollic epipedon more than 20 inches thick and lack argillic horizons. Grant soils have a solum less than 60 inches thick and decrease in clay content by more than 20 percent within 60 inches. Justin and Motley soils have a fine-loamy control section. Kingfisher and Nashville soils have a solum less than 40 inches thick. In addition, Nashville soils lack an argillic horizon. Vanoss soils decrease in clay content by more than 20 percent within 60 inches.
GEOGRAPHIC SETTING: Norge soils are on nearly level to sloping broad flats and upper side slopes of upland terraces in the Central Rolling Red Prairies. Slopes are 0 to 8 percent. They formed in loamy alluvium of Pleistocene age.
Mean Annual Precipitation: 26 to 40 inches.
Mean Annual Temperature: 58 to 64 degrees F.
Thornthwaite Annual P-E indices: 44 to 64.
Frost free days: 200 to 230.
Elevation: 900 to 1300 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the similar Bethany, Grant, Navina, Pond Creek, Teller, and Vanoss series. Bethany soils are on the same or higher landscapes. Grant soils are on side slopes of nearby landscapes. Navina, Pond Creek, Teller, and Vanoss soils are on lower terraces or on the same terrace but nearer the stream. Pond Creek soils have a mollic epipedon more than 20 inches thick and decrease in clay content within a depth of 60 inches.
DRAINAGE AND PERMEABILITY: Well drained; permeability is moderately slow; runoff is low on 0 to 1 percent slopes, medium on 1 to 5 percent slopes, and high on 5 to 8 percent slopes.
USE AND VEGETATION: Soils are mainly cultivated. Small grains, grain sorghums, cotton, and alfalfa are the principal crops. Some areas are used for tame pasture or rangeland. Native vegetation consists of mid and tall grasses.
DISTRIBUTION AND EXTENT: Central Rolling Red Prairies (MLRA 80A) of Oklahoma and Kansas. The series is moderately extensive.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Grady County, Oklahoma; 1942.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface of the soil to a depth of 18 inches (A horizon and BA horizon).
Argillic horizon - the zone from 18 inches to a depth of 66 inches (Bt horizons).
ADDITIONAL DATA: NSSL, Lincoln, Nebraska Lab. No. S53OK-59-38.