LOCATION IVAN KSEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Cumulic Hapludolls
TYPICAL PEDON: Ivan silt loam on a nearly level flood plain in a cultivated field. (Colors are for moist soil unless otherwise stated.)
A--0 to 43 centimeters (0 to 17 inches); very dark brown (10YR 2/2) silt loam, dark grayish brown (10YR 4/2) dry; moderate medium granular structure; slightly hard, friable, slightly plastic and slightly sticky; many worm casts; slight effervescence; moderately alkaline; gradual smooth boundary. (30 to 66 centimeters (12 to 26 inches) thick)
AC--43 to 81 centimeters (17 to 32 inches); very dark grayish brown (10YR 3/2) silt loam, grayish brown (10YR 5/2) dry; weak fine granular structure; slightly hard, friable, slightly plastic and slightly sticky; many fine worm holes and casts; thinly stratified with very dark brown (10YR 2/2) lenses of silty clay loam in lower part of horizon; strong effervescence; moderately alkaline; gradual smooth boundary. (0 to 76 centimeters (0 to 30 inches) thick)
C--81 to 183 centimeters (32 to 72 inches); dark grayish brown (10YR 4/2) silt loam, grayish brown (10YR 5/2) dry; massive; hard, friable, slightly plastic and slightly sticky; few lenses of grayish brown (10YR 5/2) loam; strong effervescence; moderately alkaline.
TYPE LOCATION: Chase County, Kansas; about 3 1/4 miles east of Cottonwood Falls; immediately north of road and east of bridge over South Fork Cottonwood River; 1006 meters (3,300 feet) west and 12 meters (40 feet) north of southeast corner, sec. 25, T. 19 S., R. 8 E.
RANGE IN CHARACTERISTICS:
Soil moisture: Udic bordering on ustic.
Depth to calcium carbonate: 0 to 25 centimeters (0 to 10 inches)
Particle-size control section (weighted average):
Clay content: 18 to 30 percent
Sand content: 0 to 10 percent
A horizon:
Hue: 10YR to 2.5Y
Value: 2 or 3 moist; 4 or 5 dry
Chroma: 1 or 2
Texture: silt loam or silty clay loam
Clay content: 18 to 30 percent
Calcium carbonate equivalent: 5 to 15 percent
Reaction: moderately akaline
AC horizon:
Hue: 10YR to 2.5Y
Value: 2 or 3 moist; 4 or 5 dry
Chroma: 1 or 2
Texture: silt loam or silty clay loam
Clay content: 18 to 30 percent
Calcium carbonate equivalent: 5 to 15 percent
Reaction: moderately alkaline
C horizon:
Hue: 10YR to 2.5Y
Value: 3 to 5 moist; 5 to 7 dry
Chroma: 2 or 3
Texture: loam, silt loam, or silty clay loam
Clay content: 18 to 30 percent
Calcium carbonate equivalent: 5 to 18 percent
Reaction: moderately alkaline
Notes: Strata containing more clay or more sand are below a depth of 40 inches in some pedons. Buried A horizons are in some pedons below a depth of 40 inches.
COMPETING SERIES: These are the Allison, Anthon, Huntsville, Judson, Kahola, Kennebec, Kenridge, Lindstrom, Napier, Rossville, Sturkie, and Worthen series. Allison, Anthon, Huntsville, Judson, Kahola, Kennebec, Kenridge, Lindstrom, Napier, Rossville, Sturkie, and Worthen soils have free carbonates at a depth greater than 25 centimeters (10 inches).
GEOGRAPHIC SETTING:
Parent material: calcareous silty alluvium
Landform: flood plain
Slopes: 0 to 3 percent
Mean annual temperature: 12 to 14 degrees C (54 to 58 degrees F)
Mean annual precipitation: 74 to 89 centimeters (29 to 35 inches)
Precipitation pattern: udic
Frost-free period: 170 to 190 days.
Thornthwaite Annual PE Index: 52 to 70
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Chase,
Clime,
Florence,
Irwin,
Reading,
Osage and
Tully soils.
Chase and Reading soils are on slightly higher positions. These soils have an argillic horizon.
Clime, Florence, Irwin, and Tully are on adjacent uplands. These soils are more clayey.
Osage soils are in higher positions on the flood plain and are poorly drained.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage: well
Saturated hydraulic conductivity: high
Runoff: low
Flooding: frequent or occasional
Duration: brief, March to June
USE AND VEGETATION: Most areas are cultivated.
The main principal crops are corn and soybeans.
Native vegetation is walnut, sycamore, and bur oak with an under story of tall grasses.
DISTRIBUTION AND EXTENT: LRR M; MLRA 76, 106; East-central Kansas along streams flowing eastward from the Bluestem Hills. The series is extensive.
MLRA OFFICE RESPONSIBLE: Salina, Kansas
SERIES ESTABLISHED: Riley County, Kansas, 1970.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 10 to 40 inches. (A, AC, C horizons)
Mollic epipedon: The zone from 0 to 81 centimeters (0 to 32 inches). (A, AC horizons)
3/90
1. Added "very" and "calcareous, silty" in the first sentence in paragraph 1.
2. Added wet consistence to the typical pedon.
3. Removed solumn thickness from range in characteristic section.
4. Removed all non-competing series from the range paragraph.
5. In geographic setting paragraph changed the mean annual temperature range to 12 to 14 degrees C (54 to 58 degrees F).
6. LRR=H
Converted to semitabular from narrative.
(BCE, 12/00)
10/17/05 JCR LM
Added metric conversion, updated competing series and changed permeability to saturated hydraulic conductivity.