LOCATION UTURIN                  IA

Established Series
Rev. BCJ-WND-RJB
06/2015

UTURIN SERIES

The Uturin series consists of very deep, poorly drained, slowly permeable soils formed in alluvium on flood plains. Slope ranges from 0 to 2 percent. Mean annual air temperature is about 50 degrees F, and mean annual precipitation is about 31 inches.

TAXONOMIC CLASS: Fine-silty, mixed, superactive, calcareous, mesic Mollic Fluvaquents

TYPICAL PEDON: Uturin silt loam on a nearly level flood plain in pasture. (Colors are for moist soil unless otherwise stated.)

Ap--0 to 6 inches; very dark grayish brown (10YR 3/2) silt loam, dark grayish brown (10YR 4/2) dry; weak fine granular structure; friable; slightly effervescent; slightly alkaline; abrupt smooth boundary. (5 to 10 inches thick)

C--6 to 25 inches; stratified very dark grayish brown (10YR 3/2) and dark grayish brown (10YR 4/2) silt loam; weak thin platy structure; friable; few fine prominent yellowish brown (10YR 5/6) redox (Fe) concentrations; slightly effervescent; slightly alkaline; clear smooth boundary. (10 to 30 inches thick)

2Ab1--25 to 39 inches; black (10YR 2/1) silty clay loam; weak fine subangular blocky structure parting to weak fine granular; friable; common fine roots; common fine tubular pores; strongly effervescent; slightly alkaline; clear smooth boundary.

2Ab2--39 to 55 inches; black (10YR 2/1) silty clay loam; weak fine and medium subangular blocky structure; friable; few fine roots; strongly effervescent; slightly alkaline; clear smooth boundary. (Combined thickness of 2Ab is 18 to 30 inches thick)

2Bg--55 to 60 inches; very dark gray (10YR 3/1) silty clay loam; moderate fine subangular blocky structure; firm; slight effervescent; moderately alkaline.

TYPE LOCATION: Monona County, Iowa; 750 feet west and 2450 feet south of the northeast corner of sec. 36, T. 82 N., R. 44 W. U.S.G.S. Topographic Quadrangle, Pisgah, Iowa Latitude 41 degrees, 52 minutes, and 17 seconds N. and 95 degrees, 54 minutes, and 32 seconds W.

RANGE IN CHARACTERISTICS: Depth of 2Ab horizon and thickness of silt loam alluvium range from 20 to 40 inches. Typically, the soil is slightly alkaline or moderately alkaline and has free carbonates within 10 inches of the surface.

The Ap or A horizon is very dark grayish brown (10YR 3/2) or dark brown (10YR 3/3).

The strata in the C horizon range from very dark gray (10YR 3/1) to grayish brown (10YR 5/2).

The 2Ab horizon has hue of 10YR or is neutral, value of 2 or 3, and chroma of 0 or 1. It is silty clay loam or silty clay with a clay content of 35 to 46 percent.

The 2B where present has hue of 10YR or 5Y, value of 3, and chroma of 0 or 1. It is silty clay loam or silty clay with a clay content of 35 to 46 percent.

COMPETING SERIES: These are the Blue Earth, and Moundprairie soils. Rawles soils have less than 35 percent clay in the buried soils and in addition these buried soils are slightly acid to slightly alkaline.

GEOGRAPHIC SETTING: Uturin soils are on flood plains or alluvial fans. Slope gradients range from 0 to 2 percent. They formed in recently deposited alluvium that is 20 to 40 inches thick over buried alluvial soils. Mean annual air temperature ranges from 45 to 50 degrees F, and mean annual precipitation ranges from about 26 to 34 inches. Annual frost free days range from 140 to 160 days. Elevation ranges from 700 to 1200 feet above mean sea level.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Rawles soils and the McPaul and Nishna soils. Rawles and McPaul soils are on slightly higher landscape positions and are moderately well drained. Nishna soils are in similar landscapes positions as the Uturin soils. Nishna soils have mollic epipedons.

DRAINAGE AND PERMEABILITY: Poorly drained. Runoff is slow. Permeability is slow. An apparent high water table is at a depth of 0 to 1 foot from November to July in most years.

USE AND VEGETATION: Soils are typically drained and cultivated. The main crops grown are corn and soybeans. Some areas are in pasture, some of which have scattered trees. The native vegetative cover is a herbaceous wetland community commonly inhabited with Prairie Cordgrasses, Big Bluestems, Switchgrasses, Grays Sedges, Fox Sedges, Tall Tickseeds, and Great St. John Worts.

DISTRIBUTION AND EXTENT: Western Iowa. It is of minor extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana

SERIES PROPOSED: Monona County, Iowa, 1994.

REMARKS: These soils have been placed in the Rawles series in previous surveys. Uturin soils have A or Ap horizons with mollic colors.

Diagnostic horizon and features recognized in this pedon are: ochric epipedon--zone from the surface of the soil to a depth of about 6 inches (Ap horizon); Aquic moisture regime.

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National Cooperative Soil Survey
U.S.A.