LOCATION RICEVILLE IA+MNEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Udollic Endoaqualfs
TYPICAL PEDON: Riceville loam, on a slightly convex, southeast-facing slope of 3 percent, in a cultivated field. (Colors are for moist soil unless otherwise stated)
Ap--0 to 15 centimeters; black (10YR 2/1) loam, very dark brown (10YR 2/2) kneaded, dark gray (10YR 4/1) dry; moderate fine granular structure; friable; many roots; strongly acid; abrupt smooth boundary. (15 to 23 centimeters thick)
E--15 to 23 centimeters; dark grayish brown (10YR 4/2) loam; weak medium platy structure parting to weak fine subangular blocky; friable; common distinct very dark grayish brown (10YR 3/2) silt coats and some mixing of very dark brown (10YR 2/2); few fine distinct dark yellowish brown (10YR 4/4) redoximorphic concentrations; very strongly acid; clear smooth boundary. (5 to 13 centimeters thick)
EB--23 to 38 centimeters; dark grayish brown (2.5Y 4/2) and brown (10YR 4/3) loam; weak fine subangular blocky structure; friable; common distinct dark grayish brown (2.5Y 4/2) silt and very fine sand coats on faces of peds; common fine distinct dark yellowish brown (10YR 4/4) redoximorphic concentrations; very strongly acid; gradual smooth boundary. (0 to 15 centimeters thick)
Btg1--38 to 51 centimeters; dark grayish brown (2.5Y 4/2) clay loam; weak fine subangular blocky structure; firm; few distinct clay films; many distinct dark grayish brown (2.5Y 4/2) silt and very fine sand coats on faces of peds; common fine prominent yellowish brown (10YR 5/6) redoximorphic concentrations; pebble band at 51 centimeters; very strongly acid; clear smooth boundary. (0 to 15 centimeters thick)
2Btg2--51 to 69 centimeters; mottled gray (5Y 5/1) and yellowish brown (10YR 5/6) clay loam; faces of peds gray (5Y 5/1); moderate medium subangular blocky structure; very firm; few distinct clay films; few fine prominent strong brown (7.5YR 5/8) redoximorphic concentrations; some pebbles; very strongly acid; clear wavy boundary.
2Btg3--69 to 107 centimeters; mottled gray (5Y 5/1) and yellowish brown (10YR 5/6) clay loam; moderate coarse prismatic structure parting to moderate medium subangular blocky; very firm; faces of large prisms and smaller peds are gray (5Y 5/1); common distinct silt coats with a few sand grains showing through; few distinct very dark gray (N 3/0) clay films on faces of prisms and peds in the upper part and in a few root channels; few fine prominent strong brown (7.5YR 5/8) redoximorphic concentrations; some pebbles; strongly acid; clear wavy boundary. (Combined thickness of the 2Bt horizon is 36 to 66 centimeters.)
2BCg--107 to 152 centimeters; mottled gray (5Y 5/1) and yellowish brown (10YR 5/8) clay loam; weak coarse prismatic structure parting to weak coarse subangular blocky; firm; some pebbles; slightly effervescent; slightly alkaline.
TYPE LOCATION: Major Land Resource Area (MLRA) 104-Eastern Iowa and Minnesota Till Prairies, Howard County, Iowa subset; about 1 mile west of Davis Corners; located about 510 feet west and 73 feet south of the northeast corner of section 25, T. 99 N., R. 13 W.; USGS Lourdes topographic quadrangle; lat. 43 degrees 22 minutes 15 seconds N. and long. 92 degrees 19 minutes 08 seconds W., NAD83.
RANGE IN CHARACTERISTICS:
Depth to till--35 to 75 centimeters
Depth to carbonates--75 to 125 centimeters
Clay content in the particle-size control section (weighted average)--27 to 35 percent
Sand content in the particle-size control section (weighted average)--25 to 35 percent
Special feature--some pedons have a stone line or thin layer, 2 to 13 centimeters thick of gravelly and sandy materials at the base of the loamy sediments
Ap or A (when present) horizons:
Hue--10YR
Value--2 or 3
Chroma--1 or 2
Texture--silt loam or loam
Clay content--20 to 27 percent
Sand content--20 to 30 percent
Rock fragment content--0 to 2 percent
Reaction--very strongly acid to neutral
E horizon:
Hue--10YR or 2.5Y
Value--3 to 5
Chroma--2
Texture--silt loam or loam
Clay content--20 to 27 percent
Sand content--20 to 35 percent
Rock fragment content--0 to 2 percent
Reaction--very strongly acid to moderately acid
EB horizon (when present):
Hue--10YR or 2.5Y
Value--3 or 4
Chroma--2 or 3
Texture--loam or silt loam
Clay content--20 to 32 percent
Sand content--20 to 40 percent
Rock fragment content--0 to 2 percent
Reaction--very strongly acid to moderately acid
Btg horizon (when present):
Hue--10YR or 2.5Y
Value--4
Chroma--2 or 3
Texture--clay loam
Clay content--27 to 35 percent
Sand content--25 to 40 percent
Rock fragment content--1 to 15 percent
Reaction--very strongly acid to moderately acid
2Btg horizon:
Hue--7.5YR, 10YR, 2.5Y or 5Y
Value--5 or 6
Chroma--1 to 8
Texture--clay loam
Clay content--30 to 38 percent
Sand content--30 to 40 percent
Rock fragment content--2 to 15 percent
Reaction--very strongly acid to neutral
2BC and 2C (when present) horizon:
Hue--7.5YR, 10YR, 2.5Y or 5Y
Value--5 or 6
Chroma--1 to 8
Texture--loam or clay loam
Clay content--28 to 35 percent
Sand content--30 to 40 percent
Rock fragment content--2 to 15 percent
Reaction--neutral to moderately alkaline
Calcium carbonate equivalent--less than 15 percent
Moist bulk density--1.60 to 1.75 g/cc
Some pedons have extremely coarse prismatic structure dissected by few oblique fractures in the upper 2Bt through the 2BC and in places into the 2C horizon
COMPETING SERIES: These are the
Beardstown,
Cantril, and
Schley series.
Beardstown--have a clay content of less than 27 percent in the lower third of the series control section
Cantril--do not have rock fragments in the series control section
Schley--have a clay content that averages 15 to 27 percent in the particle-size control section
GEOGRAPHIC SETTING:
Parent material--35 to 75 centimeters of loamy sediments and the underlying till
Landform--convex side slopes on dissected till plains on the Iowan Erosion Surface
Slope--0 to 5 percent
Elevation--300 to 400 meters above sea level
Mean annual air temperature--7 to 10 degrees C
Mean annual precipitation--735 to 940 millimeters
Frost-free period--160 to 195 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Cresco,
Jameston,
Lourdes and
Protivin soils.
Cresco--are at slightly higher landscape positions and have mollic epipedons 25 to 49 centimeters thick
Jameston--are at slightly lower landscape positions on head slopes of upland drainageways and are frequently saturated at the surface of the soil during March to June when precipitation is within one standard deviation of the 30 year mean of annual precipitation
Lourdes--are at higher landscape positions on side slopes and have a frequently saturated zone at a depth of 1.2 meters during March to June when precipitation is within one standard deviation of the 30 year mean of annual precipitation
Protovin--are in similar landscape positions to those of the Riceville soils and have mollic epipedons 30 to 49 centimeters thick
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat poorly drained--a frequently saturated zone occurs within depths of 0.3 to 1.0 meter during March to June when precipitation is within one standard deviation of the 30 year mean of annual precipitation and this saturation is considered apparent
Saturated hydraulic conductivity--1.00 to 10.00 micrometers per second
Surface runoff potential-- negligible or low
USE AND VEGETATION:
Most areas are cultivated. The principal crops are corn, soybeans, small grains, and legume hay. The native vegetation is big bluestem, little bluestem, switchgrass, other grasses of the tall grass prairie and mixed deciduous trees.
DISTRIBUTION AND EXTENT:
Physiographic Division--Interior Plains
Physiographic Province--Central Lowland
Physiographic section--Dissected till plains
MLRAs--Eastern Iowa and Minnesota Till Prairies (104)
Local physiographic area--Iowa Erosion Surface
LRR M; northeastern Iowa and southeastern Minnesota
Extent--small
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Howard County, Iowa, 1965.
REMARKS:
Particle-size control section--the zone from a depth of 38 to 88 centimeters;
series control section--the zone from the surface of the soil to a depth of 150 centimeters.
Diagnostic horizons and features recognized in this pedon include:
ochric epipedon--the zone from the surface of the soil to a depth of 38 centimeters (Ap, E, and EB horizons);
argillic horizon--the zone from a depth of 38 to 107 centimeters (Btg1, 2Btg2, and 2Btg3 horizons);
aquic moisture regime.
Some pedons have vertical seams or wedges of sand or loamy sand about 5 to 15 centimeters wide and about 0.9 to 1.2 meters deep extending downward from the stone line into the till.
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.