LOCATION WANN NE+CO+KS+OK+SD

Established Series
Rev. CWL/ JGA
12/2011

WANN SERIES

The Wann series includes very deep, somewhat poorly drained soils formed in stratified calcareous alluvium. These soils are on flood plains in river valleys in Central Loess Plains, MLRA 75. Slope ranges 0 to 2 percent. Mean annual temperature is about 11 degrees C (5l degrees F) and mean annual precipitation is about 640 millimeters (25 inches) at the type location.

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 4/1) fine sandy loam, very dark gray (10YR 3/1) 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 5/1) fine sandy loam, very dark gray (10YR 3/1) moist; weak coarse blocky structure parting to moderate medium granular; soft, friable; common fine roots throughout; strong effervescence; moderately alkaline. (Combined A horizons 25 to 49 centimeters (10 to 19 inches) thick.)

C--41 to 127 centimeters (l6 to 50 inches); light brownish gray (10YR 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 (10YR 5/4) moist masses of oxidized iron 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 (10YR 6/1) sandy loam, dark gray (10YR 4/1) moist; single grain; loose; soft white masses of calcium carbonate above 132 centimeters (52 inches); strong effervescence; moderately alkaline.

TYPE LOCATION: Polk County, Nebraska, about 16 kilometers (l0 miles) north and 2 kilometers (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. NAD 83

RANGE IN CHARACTERISTICS:
Soil moisture: Ustic moisture regime
Soil temperature regime: mesic
Depth to free carbonates: 0 to 25 centimeters (0 to 10 inches)
Depth to redoximorphic features: 40 centimeters (16 inches)
Depth to endosaturation: 46 centimeters (l8 inches) in wet years to 107 centimeters (42 inches) in dry years
Thickness of mollic epipedon: 25 to 49 centimeters (10 to 19 inches)
Particle-size control section (weighted average) clay content: 2 to 15 percent
Particle-size control section (weighted average) sand content: 55 to 75 percent

A or Ap horizon:
Hue: l0YR
Value: 4 or 5 dry, 2 or 3 moist
Chroma: l to 3
Texture: fine sandy loam, loam, or sandy loam
Clay content: 5 to 25
Sand content: 35 to 75
Reaction: neutral to strongly alkaline

AC horizon: (if present)
Hue: 10YR
Value: 4 or 5 dry, 3 or 4
Chroma 2 or 3
Texture: fine sandy loam, sandy loam or loamy fine sand
Clay content: 3 to 15
Sand content: 55 to 85
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, sandy loam, sand or their gravelly counterparts. Thin strata of loam or loamy sand 2 to 8 centimeters (l to 3 inches) thick are common in the control section; Usually, gravelly to gravelly coarse sand or loam is below a depth of 100 centimeters (39 inches).
Clay content: 2 to 17
Sand content: 60 to 95
Reaction: neutral to strongly alkaline

COMPETING SERIES: These are the Marksbutte, Novina, and Ovina soils.
Marksbutte soils have salinity greater than 4 mmohs.
Novina soils are moderately well drained.
Ovina soils do not have coarser sand and gravels in the lower part of the profile.

GEOGRAPHIC SETTING:
Parent material: stratified, calcareous alluvium
Landform: flood plains in river valleys
Slopes: 0 to 2 percent
Mean annual precipitation is 380 to 760 millimeters (l5 to 30 inches), in Colorado ranges down to 280 millimeters (11 inches)
Mean annual air temperature is 9 to 13 degrees C (48 to 56 degrees F)

GEOGRAPHICALLY ASSOCIATED SOILS: These include the Darr, Inavale, Lamo, Leshara, Lex, and Platte soils.
All of these soils all on a similar landforms.
Lex soils have coarse sand or gravelly sand between a depth of 50 and 100 centimeters (20 to 39 inches).
Inavale soils have a sandy particle size control section and are excessively drained.
Darr soils are somewhat excessively drained and have coarse sand or gravelly sand between a depth of 50 and 100 centimeters (20 to 39 inches).
Lamo and Leshara soils have more than 18 percent clay and less than 15 percent sand in the particle size control section.
Platte soils have a sandy particle size control section.

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 to frequent, 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, and South Dakota. LRR H Central Great Plains Winter Wheat and Range Region, MLRA 71 Central Loess Hills, MLRA 72 Central High Tableland, MLRA 73 Rolling Plains and Breaks, MLRA 75 Central Loess Plains, MLRA 77E Southern High Plains, Breaks; LRR G Western Great Plains Range and Irrigated Region, MLRA 63B Southern Rolling Pierre Shale Plains, MLRA 65 Nebraska Sand Hills, MLRA 66 Dakota-Nebraska Eroded Tableland, MLRA 67B Central High Plains, Southern Parts; LRR M Central Feed Grains and Livestock Region, MLRA 102C Loess Uplands, MLRA 106 Nebraska and Kansas Loess-Drift Hills; LRR E Rocky Mountain Range and Forest Region, MLRA 48A Southern Rocky Mountains; LRR F Northern Great Plains Spring Wheat Region, MLRA 55C Southern Black Glaciated Plains. They are most extensive along the Platte River, the Republican River, and their tributaries. Wann soils are of large extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado

SERIES ESTABLISHED: Washington County, (Akron Area), Colorado, l938.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: 0 to 41 centimeters (0 to 16 inches) (Ap and A horizons)
Redoximorphic features: 41 to 127 centimeters (16 to 50 inches) (C horizon)
Reduced matrix: starts at 127 centimeters (50 inches) (Cg horizon).

Phases of Wann soils correlated to date include saline, alkali, and saline-alkali.

Keys to soil Taxonomy: Eleventh edition, 2010

11/2005 JCR LM changed to semi-tab format, added metric conversion and saturated hydraulic conductivity.

7/2011 GLP
Added soil temperature regime. Changed thickness of mollic epipedon to fall into the requirements of a mollic epipedon. Added particle size clay and sand content in RIC. Added clay content and sand content to horizon data in RIC. Updated competing series. Changed landform to flood plains from lower slopes of the landscape in geographic setting. Changed precipitation values from centimeters to millimeters. Updated geographically associated soils. Changed precipitation values from centimeters to millimeters.

National Cooperative Soil Survey
U.S.A.