LOCATION MOINGONA IAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Argiudolls
TYPICAL PEDON: Moingona loam, on a west-facing, linear slope of 8 percent, in a cultivated field. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 18 centimeters; very dark brown (10YR 2/2) loam, very dark grayish brown (10YR 3/2) dry; moderate fine subangular blocky structure parting to weak medium granular; friable; common very fine roots; moderately acid; clear smooth boundary.
A--18 to 30 centimeters; very dark grayish brown (10YR 3/2) loam, dark grayish brown (10YR 4/2) dry; moderate fine subangular blocky structure; friable; few very fine roots; slightly acid; clear smooth boundary. (Combined thickness of the A horizon is 25 to 49 centimeters.)
Bt1--30 to 41 centimeters; brown (10YR 4/3) loam; moderate medium subangular blocky structure; friable; few very fine random roots; common distinct clay films on faces of peds; gray (10YR 6/1) uncoated fine sand and silt on faces of peds; moderately acid; clear smooth boundary.
Bt2--41 to 51 centimeters; brown (10YR 4/3) clay loam; moderate medium subangular blocky structure; friable; few very fine roots; common distinct clay films on faces of peds, on surfaces along pores, and as bridges of sand grains; moderately acid; gradual smooth boundary.
Bt3--51 to 69 centimeters; brown (10YR 4/3) clay loam; moderate medium angular blocky structure; friable; few very fine roots; common distinct clay films on faces of peds and on surfaces along pores; slightly acid; gradual smooth boundary.
Bt4--69 to 86 centimeters; dark yellowish brown (10YR 4/4) clay loam; moderate medium subangular blocky structure; friable; common distinct clay films on faces of peds, on surfaces along pores, and as bridges of sand grains; neutral; gradual smooth boundary.
Bt5--86 to 102 centimeters; brown (10YR 4/3) clay loam; weak medium subangular blocky structure; friable; common distinct clay films on faces of peds, on surfaces along pores, and as bridges of sand grains; neutral; gradual smooth boundary. (Combined thickness of the Bt horizon is 45 to 100 centimeters.)
C1--102 to 122 centimeters; brown (10YR 4/3) loam; massive; friable; few fine prominent strong brown (7.5YR 5/6) redoximorphic concentrations; slightly effervescent; moderately alkaline; clear smooth boundary. (15 to 25 centimeters thick)
C2--122 to 152 centimeters; olive brown (2.5Y 4/4) loam; massive; friable; few fine prominent strong brown (7.5YR 5/6) redoximorphic concentrations; slightly effervescent; moderately alkaline.
TYPE LOCATION: Major Land Resource Area (MLRA) 103-Central Iowa and Minnesota Till Prairies, Boone County, Iowa subset; about 2 miles north and 2.5 miles west of Ridgeport; located about 1,790 feet west and 2,140 feet north of the southeast corner of section 11, T. 85 N., R. 27 W.; USGS Fraser topographic quadrangle; lat. 42 degrees 11 minutes 13 seconds N. and long. 93 degrees 57 minutes 27 seconds W.; NAD 83.
RANGE IN CHARACTERISTICS:
Thickness of mollic epipedon--25 to 49 centimeters
Depth to carbonates--75 to 150 centimeters
Depth to lithic contact--more than 150 centimeters
Clay content of the particle-size control section (weighted average)--22 to 30 percent
Sand content of the particle-size control section (weighted average)--35 to 60 percent
Ap or A horizon:
Hue--10YR
Value--2 or 3
Chroma--1 or 2
Texture--loam or sandy loam
Clay content--10 to 25 percent
Sand content--30 to 60 percent
Rock fragment content--0 to 2 percent
Reaction--moderately acid to neutral
E horizon (if present):
Hue--10YR
Value--3 or 4
Chroma--2
Texture--loam or sandy loam
Clay content--15 to 25 percent
Sand content--30 to 60 percent
Rock fragment content--0 to 2 percent
Reaction--moderately acid to neutral
BE horizon (if present):
Hue--10YR
Value--4
Chroma--3 or 4
Texture--loam or sandy loam
Clay content--15 to 25 percent
Sand content--30 to 60 percent
Rock fragment content--0 to 2 percent
Reaction--moderately acid to neutral
Bt horizon:
Hue--10YR
Value--4 or 5
Chroma--3 or 4
Texture--loam, sandy clay loam, or clay loam
Clay content--20 to 35 percent
Sand content--30 to 60 percent
Rock fragment content--0 to 2 percent
Reaction--moderately acid to neutral
Some pedons have a BC horizon
C horizon:
Hue--10YR or 2.5Y
Value--4 or 5
Chroma--2 to 4
Texture--loam, sandy loam, or clay loam
Clay content--15 to 30 percent
Sand content--35 to 70 percent
Rock fragment content--0 to 5 percent
Reaction--slightly alkaline or moderately alkaline
Moist bulk density--1.65 to 1.75 g/cc
Some pedons have a 2C horizon below a depth of 150 centimeters with gravelly sandy loam material, dense clay loam pre-Wisconsin till, or weathered clay shale
COMPETING SERIES: These are the
Atkinson,
Burchard,
Cokato,
Cresco,
Cresent,
Durand,
Friesland,
Griswold,
Hitt,
Jasper,
Joslin,
Keosauqua,
Kishwaukee,
Marbletown,
Morrill,
Nuxmaruhanixete,
Pana,
Parmod,
Penfield,
Reedslake,
Ringwood,
Rockton,
Schoolcraft,
Shelby,
Sibleyville,
Velma, and
Winnebago series.
Atkinson--have a lithic contact with limestone bedrock within a depth of 150 centimeters
Burchard--have carbonates within a depth of 75 centimeters
Cokato--do not have a frequently saturated zone within a depth of 1.8 meters during the wettest periods of years when precipitation is within one standard deviation of the 30 year mean of annual precipitation
Cresco--have a bulk density of 1.75 to 1.9 gm/cc in the lower third of the series control section
Cresent--have a clay content of 2 to 10 percent and a sand content of 70 to 95 percent in the lower third of the series control section
Durand--have matrix hues of 5YR or 7.5YR in the middle third of the series control section
Friesland--have a sand content that averages less than 20 percent in the lower third of the series control section
Griswold--have a rock fragment content of 10 to 35 percent in the lower third of the series control section
Hitt--have a lithic contact with limestone bedrock within a depth of 150 centimeters and have matrix hues of 2.5YR, 5YR, or 7.5YR in the middle third of the series control section
Jasper--have stratified textures with a clay content of 5 to 20 percent and a sand content of 45 to 70 percent in the lower third of the series control section
Joslin--have a matrix hue of 2.5YR and a clay content averaging between 35 and 50 percent in the middle third of the series control section
Keosauqua--have a clay content of 2 to 10 percent and a sand content of 80 to 90 percent in the lower third of the series control section
Kishwaukee--have a rock fragment content of 15 to 35 percent in the lower third of the series control section
Marbletown--have a paralithic contact in sandstone or shale within a depth of 150 centimeters
Morrill--have matrix hues of 5YR or 7.5YR in the middle third of the series control section
Nuxmaruhanixete--have a clay content of 2 to 5 percent and a rock fragment content of 15 to 60 percent in the lower third of the series control section
Pana--do not have carbonates in the series control section
Parmod--have a sand content of less than 15 percent in the upper third of the series control section
Penfield--have stratified materials with a clay content of 5 to 20 percent and a sand content of 45 to 70 percent in the lower third of the series control section
Reedslake--have carbonates within depths of 45 to 100 centimeters, have a rock fragment content of 1 to 8 percent throughout the series control section , and have a sand content of 30 to 45 percent in the lower third of the series control section
Ringwood--have a rock fragment content of 10 and 40 percent in the lower third of the series control section
Rockton--have a lithic contact with limestone bedrock within a depth of 100 centimeters
Schoolcraft-- have a sand content of more than 80 percent in the lower third of the series control section
Shelby--have carbonates within a depth of 75 centimeters
Sibleyville--have sandstone or sandy and silty shale within a depth of 100 centimeters
Velma--have a reaction range of very strongly acid or strongly acid in the middle part of the series control section
Winnebago--have matrix hue of 5YR or 7.5YR in the middle part of the series control section
GEOGRAPHIC SETTING:
Parent material--loamy local colluvial and alluvial sediments
Landform--foot slopes and alluvial fans
Slope--0 to 18 percent
Elevation--300 to 400 meters above sea level
Mean annual air temperature--6 to 10 degrees C
Mean annual precipitation--585 to 890 millimeters
Frost-free period--155 to 200 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Hayden,
Lester,
Spillville, and
Storden soils.
Hayden--are at higher landscape positions on side slopes and do not have a mollic epipedon
Lester--are at higher landscape positions on side slopes and do not have a mollic epipedon
Spillville--are at lower landscape positions on foot slopes and floodplains, have a mollic epipedon 100 to 150 centimeters thick, and do not have an argillic horizon
Storden--are at higher landscape positions on side slopes and do not have a mollic epipedon
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--moderately well drained--a frequently saturated zone occurs within depths of 1.2 to 1.8 meters during the wettest periods of years when precipitation is within one standard deviation of the 30 year mean of annual precipitation and is considered apparent
Saturated hydraulic conductivity--1.00 to 10.00 micrometers per second
USE AND VEGETATION:
Most areas are cultivated. The principal crops are corn, soybeans, oats, and hay on the nearly level and gently sloping areas. Moderately and strongly sloping areas are mainly improved or native grass pasture. The native vegetation is mixed big bluestem, little bluestem, switchgrass, other grasses of the tall grass prairie and deciduous trees.
DISTRIBUTION AND EXTENT:
Physiographic Division--Interior Plains
Physiographic Province--Central Lowland
Physiographic section--Western lake section
MLRA--Central Iowa and Minnesota Till Prairies (103)
LRR M; north-central Iowa
Extent--small
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Boone County, Iowa, 1977.
REMARKS:
Particle-size control section--the zone from a depth of 30 to 80 centimeters;
series control section--the zone from the surface to a depth of 150 centimeters.
Diagnostic horizons and feature recognized in this pedon include:
mollic epipedon--the zone from the surface of the soil to a depth of 30 centimeters (Ap and A horizons);
argillic horizon--the zone from a depth of 30 to 102 centimeters (Bt1, Bt2, Bt3, Bt4, and Bt5 horizons);
udic moisture regime.
Cation-exchange activity class is inferred from lab data from similar soils in the surrounding area.
Taxonomy version--Keys to Soil Taxonomy, tenth edition, 2006.