LOCATION IDA IA+MO NE

Established Series
Rev. LEB-DJP-AAC
01/2016

IDA SERIES

The Ida series consists of very deep, well drained soils formed in calcareous loess. These soils are on side slopes and crests on dissected till plains and on risers on stream terraces. Slopes range from 2 to 60 percent. Mean annual air temperature is about 9 degrees C (49 degrees F). Mean annual precipitation is about 74 centimeters (29 inches).

TAXONOMIC CLASS: Fine-silty, mixed, superactive, calcareous, mesic Typic Udorthents

TYPICAL PEDON: Ida silt loam, on a 5 percent slope, in a cultivated field, at an elevation of 425 meters (1,395 feet) above sea level. (Colors are for moist soil unless otherwise stated.)

Ap--0 to 15 centimeters (0 to 6 inches); about 90 percent brown (10YR 4/3) and about 10 percent brown (10YR 5/3) silt loam, pale brown (10YR 6/3) dry; weak medium subangular blocky structure; friable; common very fine and fine roots; few tubular pores; dark brown (10YR 3/3) organic coats on faces of peds; few fine and medium irregular carbonate concretions; few fine faint brown (7.5YR 4/4) relict redoximorphic concentrations; strongly effervescent; slightly alkaline; clear smooth boundary. [8 to 23 centimeters (3 to 9 inches) thick]

C1--15 to 30 centimeters (6 to 12 inches); brown (10YR 5/3) silt loam; massive; friable; few fine roots; common fine tubular pores; dark brown (10YR 3/3) organic coats; common fine and medium irregular carbonate concretions; few fine faint brown (7.5YR 4/4) relict redoximorphic concentrations; strongly effervescent; moderately alkaline; clear smooth boundary.

C2--30 to 46 centimeters (12 to 18 inches); yellowish brown (10YR 5/4) silt loam; massive; friable; few fine roots; common fine tubular pores; common fine and medium irregular carbonate concretions; few fine irregular very dark brown (7.5YR 2/2) soft masses of manganese; few fine distinct grayish brown (10YR 5/2) relict redoximorphic depletions; few fine distinct yellowish brown (10YR 5/6) relict redoximorphic concentrations; strongly effervescent; moderately alkaline; clear smooth boundary.

C3--46 to 64 centimeters (18 to 25 inches); yellowish brown (10YR 5/4) silt loam; massive; friable; few fine roots; common fine tubular pores; few fine irregular carbonate concretions; few fine irregular very dark brown (7.5YR 2/2) soft masses of manganese; few fine distinct grayish brown (10YR 5/2) relict redoximorphic depletions; few fine distinct yellowish brown (10YR 5/6) relict redoximorphic concentrations; strongly effervescent; moderately alkaline; clear smooth boundary.

C4--64 to 79 centimeters (25 to 31 inches); yellowish brown (10YR 5/4) silt loam; massive; friable; few fine roots; common fine tubular pores; few fine irregular carbonate concretions; few fine irregular very dark brown (7.5YR 2/2) soft masses of manganese; common coarse distinct light brownish gray (10YR 6/2) relict redoximorphic depletions; common coarse distinct yellowish brown (10YR 5/6), and few fine distinct strong brown (7.5YR 5/6) relict redoximorphic concentrations; strongly effervescent; moderately alkaline; gradual smooth boundary.

C5--79 to 117 centimeters (31 to 46 inches); yellowish brown (10YR 5/4) silt loam; massive; friable; common fine tubular pores; few fine irregular carbonate concretions; few fine irregular very dark brown (7.5YR 2/2) soft masses of manganese; common coarse distinct light brownish gray (2.5Y 6/2) relict redoximorphic depletions; common coarse distinct strong brown (7.5YR 5/6) relict redoximorphic concentrations; strongly effervescent; moderately alkaline; gradual smooth boundary.

C6--117 to 180 centimeters (46 to 71 inches); yellowish brown (10YR 5/4) silt loam; massive; friable; common fine tubular pores; few fine irregular dark brown (7.5YR 3/2) soft masses of manganese; common coarse distinct light brownish gray (2.5Y 6/2) relict redoximorphic depletions; common coarse distinct strong brown (7.5YR 5/6) relict redoximorphic concentrations; strongly effervescent; moderately alkaline; gradual smooth boundary.

C7--180 to 203 centimeters (71 to 80 inches); yellowish brown (10YR 5/4) silt loam; massive; friable; few fine irregular dark brown (7.5YR 3/2) soft masses of manganese; common coarse distinct light brownish gray (2.5Y 6/2) relict redoximorphic depletions; common coarse distinct strong brown (7.5YR 5/6) relict redoximorphic concentrations; strongly effervescent; moderately alkaline.

TYPE LOCATION: Major Land Resource Area (MLRA) 107; Crawford County, Iowa; about 150 feet north and 2,400 feet west of the southeast corner of section 7, T. 85 N., R.41 W.; USGS Danbury quadrangle; lat. 42 degrees 10 minutes 57.6 seconds N. and long. 95 degrees 39 minutes 41.3 seconds W., NAD 83.

RANGE IN CHARACTERISTICS:
Depth to carbonates--0 to 25 centimeters (0 to 10 inches)
Content of clay in the particle-size control section (weighted average)--18 to 25 percent
Content of sand in the particle-size control section (weighted average)--less than 15 percent

Ap or A horizon:
Hue--10YR
Value--3 to 5
Chroma--2 or 3
Texture--silt loam or silty clay loam
Clay content--18 to 30 percent
Sand content--less than 15 percent
Calcium carbonate equivalent--6 to 14 percent
Reaction--neutral to moderately alkaline
Special features--Redoximorphic concentrations are considered relict

AC horizon (if it occurs):
Hue--10YR
Value--3 to 5
Chroma--3 or 4
Texture--silt loam
Clay content--18 to 25 percent
Sand content--less than 15 percent
Calcium carbonate equivalent--6 to 14 percent
Reaction--slightly alkaline or moderately alkaline
Special features--Redoximorphic concentrations are considered relict

C horizon:
Hue--10YR or 2.5Y
Value--4 or 5
Chroma--3 to 6
Texture--silt loam
Clay content--18 to 25 percent
Sand content--less than 15 percent
Calcium carbonate equivalent--6 to 14 percent
Reaction--slightly alkaline or moderately alkaline
Special features--Redoximorphic concentrations and depletions are considered relict

COMPETING SERIES: This is the Dow series.
Dow--have a matrix chroma of 2 in the lower two thirds of the series control section

GEOGRAPHIC SETTING:
Parent material--calcareous loess
Landform--side slopes and crests on dissected till plains and on risers on stream terraces
Slopes--2 to 60 percent
Elevation--335 to 457 meters (1,100 to 1,500 feet) above sea level
Mean annual air temperature--8 to 11 degrees C (47 to 52 degrees F)
Mean annual precipitation--66 to 81 centimeters (26 to 32 inches)
Frost-free period--145 to 175 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dow, Monona, Napier, and Strahan soils.
Dow--are in similar landscape positions to those of the Ida soils and have matrix chroma of 2 in the lower two thirds of the series control section
Monona--are at higher elevations on side slopes and interfluves have cambic horizons, and have mollic epipedons 25 to 61 centimeters (10 to 24 inches) thick
Napier--are at lower elevations on base slopes and alluvial fans and have mollic epipedons 61 to 102 centimeters (24 to 40 inches) thick
Strahan--are at higher elevations on side slopes and are at lower elevations on head slopes and do not have carbonates within a depth of 76 centimeters (30 inches)

DRAINAGE AND PERMEABILITY:
Drainage class--well drained--saturation does not occur within a depth of 1.8 meters (6 feet) during the wettest periods of most years
Saturated hydraulic conductivity--moderately high or high
Surface runoff potential--low to high

USE AND VEGETATION:
The less sloping areas are cultivated. The principal crops are corn, soybeans, small grain, and hay. The more sloping areas are pastured. The native vegetation is big bluestem, little bluestem, sideoats grama, indiangrass, switchgrass, and other grasses of the short grass and tall grass prairie.

DISTRIBUTION AND EXTENT:
Physiographic Division--Interior Plains
Physiographic Province--Central Lowland
Physiographic section(s)--Dissected till plains
MLRA--Iowa and Missouri Deep Loess Hills (107)
LRR M; western Iowa near the Missouri River, eastern Nebraska, and northwestern Missouri
Extent--large

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

SERIES ESTABLISHED: Monona County, Iowa, 1956.

REMARKS:
Particle-size control section--the zone from a depth of 25 to 100 centimeters (10 to 40 inches) (C1, C2, C3, C4, and C5 horizons);
series control section--the zone from the surface to a depth of 150 centimeters (0 to 60 inches) (C1, C2, C3, C4, C5, and C6 horizons).

Diagnostic horizons and features recognized in this pedon:
ochric epipedon--the zone from the surface to depth of 15 centimeters (0 to 6 inches) (Ap horizon);
udic moisture regime.

Cation exchange activity class is supported by lab sample number S98IA-047-005, KSSL.

Taxonomy version--twelfth edition, 2014.

The redoximorphic features described in this pedon are believed to be relict and were not considered as indicators of present drainage conditions. These features were not considered in the classification of these soils.

ADDITIONAL DATA:
Laboratory data--Iowa State University Experimental Station, pedon number 95IA047005L;
Laboratory data--Kellogg Soil Survey Laboratory, Lincoln, Nebraska, pedon numbers S98IA-047-005 and S96IA-193-003, (http://ncsslabdatamart.sc.egov.usda.gov/).

National Cooperative Soil Survey
U.S.A.