LOCATION GRUNDY MO+IA KSEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Aquertic Argiudolls
TYPICAL PEDON: Grundy silt loam, on a 3 percent slope, in a cultivated field. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 23 centimeters; black (10YR 2/1) silt loam, dark gray (10YR 4/1) dry; weak fine granular structure; friable; common fine and medium roots; neutral, clear smooth boundary.
A--23 to 28 centimeters); black (10YR 2/1) silty clay loam, dark gray (10YR 4/1) dry; weak very fine subangular blocky structure; friable; common fine and medium roots; slightly acid; clear smooth boundary.
BA--28 to 36 centimeters; very dark gray (10YR 3/1) silty clay loam, gray (10YR 5/1) dry; moderate very fine subangular blocky structure; firm; common fine roots; slightly acid; clear smooth boundary.
Btg1--36 to 46 centimeters; dark grayish brown (10YR 4/2) silty clay; moderate very fine and fine subangular blocky structure; firm; common fine roots; common distinct clay films on faces of peds; common fine distinct yellowish brown (10YR 5/4) iron masses with diffuse boundaries; moderately acid; clear smooth boundary.
Btg2--46 to 61 centimeters; dark grayish brown (10YR 4/2) silty clay; moderate fine subangular blocky structure; firm; few fine roots; many distinct clay films on faces of peds; common fine prominent yellowish brown (10YR 5/6) iron masses with diffuse boundaries; slightly acid; gradual smooth boundary.
Btg3--61 to 97 centimeters; grayish brown (2.5Y 5/2) silty clay; weak medium prismatic structure parting to weak medium subangular blocky; firm; common distinct clay films on faces of peds; common fine distinct yellowish brown (10YR 5/4) iron masses with diffuse boundaries; few fine black streaks in cracks and few fine dark concretions (oxides); neutral; gradual smooth boundary.
Btg4--97 to 135 centimeters; grayish brown (2.5Y 5/2) silty clay loam; weak fine prismatic structure parting to weak fine subangular blocky; firm; few faint clay films on faces of peds; few medium prominent strong brown (7.5YR 5/8) iron masses with diffuse boundaries; few fine dark streaks in cracks (oxides); neutral; gradual smooth boundary. (Combined thickness of the Btg horizon is 65 to 140 centimeters.)
Cg--135 to 183 centimeters; olive gray (5Y 5/2) silty clay loam; massive; firm; common fine prominent yellowish brown (10YR 5/4) iron masses with diffuse boundaries; neutral.
TYPE LOCATION: Major Land Resource Area (MLRA) 109-Iowa and Missouri Heavy Till Plain; Harrison County, Missouri subset; about 2.5 miles north and 2 miles west of Ridgeway; located about 1,175 feet east and 125 feet south of the center of section 19, T. 65 N., R. 27 W.; USGS Eagleville topographic quadrangle; lat. 40 degrees 25 minutes 4 seconds N. and long. 93 degrees 58 minutes 44 seconds W., NAD 83.
RANGE IN CHARACTERISTICS:
Thickness of the mollic epipedon--28 to 49 centimeters
Depth to carbonates--more than 183 centimeters
Clay content in the particle-size control section (weighted average)--42 to 48 percent
Sand content in the particle-size control section (weighted average)--0 to 5 percent
Rock fragment content--0 percent
Ap or A horizon:
Hue--10YR
Value--2 or 3
Chroma--1 or 2
Texture--silt loam or silty clay loam
Clay content--20 to 35 percent
Sand content--0 to 5 percent
Reaction--pH 5.6 to 7.3
Thickness--25 to 49 centimeters
BA or AB horizon (where present):
Hue--10YR
Value--2 or 3
Chroma--1 or 2
Texture--silty clay loam
Clay content--28 to 35 percent
Sand content--0 to 5 percent
Reaction--pH 5.6 to 7.3
Thickness--0 to 15 centimeters
Btg horizon:
Hue--10YR to 2.5Y
Value--3 to 6
Chroma--1 to 3
Texture--silty clay loam or silty clay
Clay content--42 to 48 percent with layers less than 18 centimeters thick up to 50 percent
Sand content--0 to 5 percent
Reaction--pH 5.1 to 7.3
Thickness--65 to 140 centimeters
Cg horizon:
Hue--10YR to 5Y
Value--4 to 6
Chroma--1 or 2
Texture--silt clay loam or silt loam
Clay content--24 to 35 percent
Sand content--0 to 5 percent
Reaction--pH 6.1 to 7.3
COMPETING SERIES: These are the
Adair,
Arisburg,
Arispe,
Chase,
Good Thunder,
Greenton,
Lagonda,
Lamoni,
Macksburg,
Mahaska,
Martin,
Mayberry,
Seymour,
Shorewood,
Tina, and
Wymore series.
Adair--have a sand content that averages 15 to 35 percent in the particle-size control section
Arisburg--have a clay content that averages 35 to 42 percent in the particle-size control section
Arispe--have a clay content that averages 35 to 40 percent in the particle-size control section
Chase--have a mollic epipedon more than 90 centimeters thick
Good Thunder--have carbonates within a depth of 127 centimeters
Greenton--have shale fragments in the lower half of the series control section
Lagonda--have a sand content of more than 5 percent in the lower half of the series control section
Lamoni--have a sand content of more than 15 percent throughout the series control section
Macksburg--have a clay content that averages 35 to 42 percent in the particle-size control section
Mahaska--have a clay content that averages 35 to 42 percent in the particle-size control section
Martin--have a mollic epipedon 60 to 90 centimeters thick
Mayberry--have a sand content that averages more than 5 percent in the particle-size control section and have matrix hue of 5YR or 7.5YR in the particle-size control section
Seymour--have a subhorizon within the argillic horizon with a clay content of 50 to 55 percent
Shorewood--have carbonates within a depth of 127 centimeters and have a rock fragment content of 2 to 8 percent in the lower third of the series control section
Tina--have a sand content of more than 20 percent in the lower third of the series control section
Wymore--have a clay content that averages 42 to 55 percent in the particle-size control section and have carbonates within a depth of 127 centimeters
GEOGRAPHIC SETTING:
Parent material--loess
Landform--divides and interfluves
Slope--0 to 9 percent
Elevation--100 to 505 meters above sea level
Mean annual air temperature--8 to 17 degrees C
Mean annual precipitation--660 to 1,220 millimeters
Frost-free period--155 to 255 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Adair,
Haig,
Lagonda, and
Shelby soils.
Adair--are on lower landscape positions on side slopes and have a sand content that averages 15 to 35 percent in the particle-size control section
Haig--are on slightly lower landscape positions on interfluves and are frequently saturated from the surface of the soil to a depth of 0.3 meter during the wettest period of years when precipitation is within one standard deviation of the 30 year mean of annual precipitation
Lagonda--are at lower landscape positions on side slopes and have a sand content of more than 5 percent in the lower half of the series control section
Shelby--are at lower landscape positions on side slopes and have a sand content of 30 to 50 percent in the lower third of the series control section
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 the wettest period of years when precipitation is within one standard deviation of the 30 year mean of annual precipitation, this saturation is considered perched
Saturated hydraulic conductivity--0.1 to 1.0 micrometers per second
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, and other grasses of the tall grass prairie.
DISTRIBUTION AND EXTENT:
Physiographic Division--Interior Plains
Physiographic Province--Central Lowland
Physiographic sections--Dissected till plains, Osage plain, and Till plains
MLRAs--Nebraska and Kansas Loess-Drift Hills (106),
Iowa and Missouri Deep Loess Hills, (107B),
Illinois and Iowa Deep Loess and Drift, West-Central Part (108C),
Illinois and Iowa Deep Loess and Drift, Western Part (108D),
Iowa and Missouri Heavy Till Plain (109),
Cherokee Prairies (112), and
Central Mississippi Valley Wooded Slopes, Western Part (115B)
LRR M; northern Missouri, southern Iowa, and northeastern Kansas
Extent--large
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana; MLRA SSO 10-7 (Gallatin, Missouri).
SERIES ESTABLISHED: Grundy County, Missouri, 1916
REMARKS:
Particle-size control section--the zone from a depth of 36 to 86 centimeters (Btg1, Btg2, and Btg3 horizons);
series control section--the zone from the surface to a depth of 150 centimeters (Ap, A, BA, Btg1, Btg2, Btg3, Btg4, and Cg horizons).
Diagnostic horizons and features recognized in this pedon include:
mollic epipedon--the zone from the surface to a depth of 36 centimeters (Ap, A, and BA horizons);
argillic horizon--the zone from a depth of 36 to 135 centimeters (Btg1, Btg2, Btg3, and Btg4 horizons);
udic moisture regime.
Aquertic subgroup based on colors within the upper 25 centimeters of the argillic horizon and linear extensibility greater than 6.0 centimeters between the surface and a depth of 100 centimeters.
Taxonomy version--Keys to Soil Taxonomy, tenth edition, 2006.