LOCATION EXCELLO MOEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Cumulic Endoaquolls
TYPICAL PEDON: Excello silt loam - on a slope of about 1 percent in pasture. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 6 inches; very dark gray (10YR 3/1) silt loam, gray (10YR 5/1) dry; weak thin platy structure parting to strong fine granular; very friable; many very fine roots; few very fine tubular pores; neutral; clear smooth boundary.
A1--6 to 13 inches; very dark gray (10YR 3/1) silt loam, dark gray (10YR 4/1) dry; weak very fine and fine subangular blocky structure parting to moderate very fine granular; very friable; common very fine roots; few fine tubular and common very fine tubular pores; neutral; clear smooth boundary.
A2--13 to 18 inches; black (10YR 2/1) loam, dark gray (10YR 4/1) dry; weak very fine subangular blocky structure parting to moderate very fine granular; very friable; common very fine roots; few fine tubular and common very fine tubular pores; neutral; clear smooth boundary. (Combined thickness of the A horizons is 12 to 30 inches.)
BA--18 to 25 inches; black (10YR 2/1) loam, dark gray (10YR 4/1) dry; weak very fine and fine subangular blocky structure; friable; few very fine roots; common very fine tubular pores; neutral; clear smooth boundary. (0 to 7 inches thick)
Bg1--25 to 33 inches; black (10YR 2/1) loam, dark gray (10YR 4/1) dry; moderate very fine subangular blocky structure; friable; few very fine roots; few fine tubular and common very fine tubular pores; few faint clay films in pores and on faces of peds; slightly acid; clear smooth boundary.
Bg2--33 to 43 inches; black (10YR 2/1) loam, dark gray (10YR 4/1) dry; moderate medium prismatic structure parting to weak very fine subangular blocky; friable; few very fine roots; few fine tubular and many very fine tubular pores; few faint clay films in pores and on faces of peds; few fine distinct dark brown (10YR 3/3) masses of iron accumulation in ped interiors; slightly acid; clear smooth boundary.
Bg3--43 to 49 inches; very dark gray (10YR 3/1) loam, dark gray (10YR 4/1) dry; weak medium prismatic structure; friable; few fine tubular and common very fine tubular pores; few faint clay films on faces of peds; few fine distinct dark yellowish brown (10YR 3/4) masses of iron accumulation in ped interiors; slightly acid; clear smooth boundary. (Combined thickness of the Bg horizon is 18 to 40 inches.)
BCg--49 to 60 inches; very dark gray (5Y 3/1) loam, dark gray (5Y 4/1) dry; weak medium prismatic structure; friable; few fine tubular and many very fine tubular pores; common fine prominent dark yellowish brown (10YR 3/4) and yellowish brown (10YR 5/4) masses of iron accumulationin in ped interiors; slightly acid.
TYPE LOCATION: Macon County, Missouri; about 4 miles north of Goldsberry, 5000 feet east and 200 feet south of the northwest corner of Sec. 15, T. 60 N., R. 17 W.
RANGE IN CHARACTERISTICS: The mollic epipedon is 24 or more inches thick. Reaction is slightly acid or neutral.
The Ap or A horizon has hue of 10YR or is neutral, value of 2 or 3, 4 or 5 dry and chroma of 1 or less. It is loam, silt loam, clay loam, or silty clay loam. Some pedons have overwash with chroma of 2.
The BA horizon has hue of 10YR or is neutral, value of 2 or 3, 4 or 5 dry and chroma of 1 or less. It is loam, clay loam, or silty clay loam.
The Bg horizon has hue of 10YR to 5Y or is neutral, value of 2 to 4, chroma of 1 or less in the upper part and chroma of 1 or 2 in the lower part. Fe masses of higher chroma are in some part. It is loam, clay loam, sandy clay loam, or silty clay loam.
The BCg horizon has hue of 10YR to 5Y or is neutral, value of 2 to 5, chroma of 0 to 2, and has Fe masses of higher chroma. It is loam, clay loam, or sandy clay loam.
The Cg horizon, if present, has hue of 10YR to 5Y or is neutral, value of 3 to 6, chroma of 0 to 2, and has Fe masses of higher chroma. It is loam, clay loam, or sandy clay loam. Some pedons have strata of coarser or finer texture.
COMPETING SERIES: These include the Coland, Comfrey, Delft, Gielow, Glencoe, James Canyon, Keddie, Kimmerling, Konner, McClave, Peoh, Romnell, Shandep and Wenas series. All of these soils except Gielow have a mean annual temperature of less than 54 degrees F. in the soil temperature control section. Gielow soils are dry in the soil moisture control section 90 out of the 120 days following the summer solstice.
GEOGRAPHIC SETTING: Excello soils are on nearly level or very gently sloping flood plains, gently sloping alluvial fans, and concave toeslopes. These are the lower parts of gently sloping upland drainageways near the water course. Slopes range from 0 to 5 percent. Mean annual temperature ranges from about 52 to 57 degrees F, and mean annual precipitation ranges from about 34 to 40 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: On flood plains and alluvial fans, these include the Beaucoup, Blackoar, Colo, Fatima, Kennebec, Tice, Vigar, Zook and Nodaway soils. Beaucoup, Blackoar, Colo, Fatima, Kennebec, Nodaway and Tice soils are fine-silty. Vigar soils have an argillic horizon. Zook soils are fine. Beaucoup, Blackoar, Colo and Zook soils are in positions similar to the Excello soils. Typically, the Fatima, Kennebec, Nodaway and Tice soils are on slightly higher elevations than the Excello soils. In upland drainageways Vigar and Zook soils are common associates upslope from the Excello soils.
DRAINAGE AND PERMEABILITY: Poorly drained and somewhat poorly drained. Surface runoff is slow. Permeability is moderate. In undisturbed areas the watertable is at depths of 0 to 1.5 feet for some time in most years. In other areas the upper depth of an apparent water table is at 1.0 to 3.0 feet during November to May. Flooding is rare to common.
USE AND VEGETATION: Many areas are used as permanent pasture that contains widely spaced willow trees. Some areas are used to grow corn and soybeans. Native vegetation is grass.
DISTRIBUTION AND EXTENT: Northeastern Missouri. Excello soils are of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Macon County, Missouri, 1991.
REMARKS: Diagnostic horizons and features recognized in this pedon are: mollic epipedon - the zone from the surface to a depth of 60 inches. Data are available from the Missouri Characterization Laboratory, sample number 89MO-121-05.