LOCATION WANN NE+CO KS OK SDEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, mesic Fluvaquentic Haplustolls
TYPICAL PEDON: Wann fine sandy loam - with a slope of less than l percent in a cultivated field. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 15 centimeters (0 to 6 inches); dark gray (10YR 4/l) fine sandy loam, very dark gray (10YR 3/l) moist; weak medium granular structure; soft, very friable; many fine roots throughout; slightly alkaline; abrupt smooth boundary.
A--15 to 41 centimeters (6 to l6 inches); gray (10YR 5/l) fine sandy loam, very dark gray (10YR 3/l) moist; weak coarse blocky structure parting to moderate medium granular; soft, friable; common fine roots throughout; strong effervescence; moderately alkaline. (Combined A horizons 20 to 51 centimeters (8 to 20 inches) thick.)
C--41 to 127 centimeters (l6 to 50 inches); light brownish gray (l0YR 6/2) sandy loam, grayish brown (10YR 5/2) moist, with thin strata of gray (10YR 5/1) fine sandy loam, very dark gray (10YR 3/1) moist; common medium distinct yellowish brown (l0YR 5/4) moist iron masses in the matrix; weak coarse prismatic structure; soft, friable; strong effervescence; moderately alkaline; clear wavy boundary. (61 to 91 centimeters (24 to 36 inches) thick)
Cg--127 to 152 centimeters (50 to 60 inches); gray (l0YR 6/l) sandy loam, dark gray (l0YR 4/l) moist; single grain; loose; soft white masses of lime above 132 centimeters (52 inches); strong effervescence; moderately alkaline.
TYPE LOCATION: Polk County, Nebraska, about l0 miles north and l mile west of Shelby, Nebraska; 244 meters (800 feet) south and 30 meters (l00 feet) east of the northwest corner, sec. 28, T. l6 N., R. l W. USGS Columbus Southwest topographic quadrangle; latitude 41 degrees 20 minutes, 6 seconds North and longitude 97 degrees, 26 minutes, 40 seconds West.
RANGE IN CHARACTERISTICS:
Soil moisture: moist solum from December through April and intermittently moist from May through December, driest July through September
Depth to secondary carbonates: Some pedons contain carbonates at the surface and typically contain free carbonates in particle size control section
Depth to redoximorphic features: present in the C horizon and can occur in any part of the profile beneath the A horizon
Depth to endosaturation: 46 centimeters (l8 inches) in wet years to 107 centimeters (42 inches) in dry years
Thickness of mollic epipedon: 20 to 51 centimeters (8 to 20 inches)
A horizon:
Hue: l0YR
Value: 4 or 5 dry, 2 or 3 moist
Chroma: l to 3
Texture: fine sandy loam, loam, or sandy loam, but the upper l0 inches ranges from silt loam to loamy sand
Reaction: neutral to strongly alkaline
AC horizon: (if present 1 to 10 inches thick)
Hue: 10YR
Value: 4 or 5 dry, 3 to 4
Chroma 2 or 3
Texture: fine sandy loam, sandy loam or loamy fine sand
Reaction: neutral to strongly alkaline
C and Cg horizons:
Hue: l0YR or 2.5Y
Value: 5 to 7 dry, 4 to 6 moist
Chroma: 1 to 4
Texture: fine sandy loam or sandy loam and typically is coarser textured below a depth of 40 inches. Thin strata of loam or loamy sand l to 3 inches thick are common in the control section; In places, sand, gravelly to gravelly coarse sand or loam is below a depth of 40 inches
Reaction: neutral to strongly alkaline
COMPETING SERIES: These are the
Marksbutte
Ovina, and
Sunset soils.
Marksbutte soils have gravelly sand or coarse sand at depths less than 40 inches and have salinity greater than 4 mmohs.
Ovina soils have less fine and coarser sand in the lower part of the control section.
Sunset soils contain more clay in the control section.
GEOGRAPHIC SETTING:
Parent material: stratified, calcareous alluvium
Landform: lower slopes of the landscape
Slopes: 0 to 2 percent
Mean annual precipitation is 38 to 76 centimeters (l5 to 30 inches), in Colorado ranges down to 28 centimeters (11 inches)
Mean annual temperature is 9 to 13 degrees C (48 to 56 degrees F)
GEOGRAPHICALLY ASSOCIATED SOILS: These include the
Alda,
Cass,
Darr,
Inavale,
Lamo,
Leshara,
Lex,
Ord, and
Platte soils all on a similiar flood plain.
Lex soils have coarse sand or gravelly sand between a depth of 20 to 40 inches. Inavale soils are coarser textured and better drained.
Cass soils are better drained.
Darr soils are better drained and have coarse sand or gravelly sand between a depth of 20 to 40 inches.
Lamo and Leshara soils are fine-silty.
Platte soils are shallow to coarse sand, gravelly sand or gravelly coarse sand. Ord soils have sand at 20 to 35 inches and are more clacareous.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage: somewhat poorly drained
Runoff: slow
Saturated hydraulic conductivity: Very High
The seasonal high water table: 46 centimeters (18 inches) wet years to 107 centimeters (42 inches) dry years
Flooding: rare or common, brief durations
USE AND VEGETATION: Most areas are cultivated.
The principal crops are alfalfa, corn, grain sorghum, and soybeans. Many areas are irrigated.
Native grasses are big bluestem, switchgrass and Indiangrass.
DISTRIBUTION AND EXTENT: In the central, eastern, and southern parts of Nebraska and Colorado, Kansas, Oklahoma, and South Dakota. They are most extensive along the Platte River, the Republican River, and their tributaries. Wann soils are of large extent.
MLRA OFFICE RESPONSIBLE: Salina, Kansas
SERIES ESTABLISHED: Washington County, (Akron Area), Colorado, l938.
REMARKS: Diagnostic horizons and features recognized in this pedon are: Carbonates: 0 to 38 centimeters (0 to 15 inches), but in the eastern extent leached to 61 centimeters (24 inches),
Further study is needed to determine if this series is calcareous.
Phases of Wann soils correlated to date include saline, alkali, and saline-alkali.
11/2005 JCR LM changed to semi-tab format, added metric conversion and saturated hydraulic conductivity.