LOCATION ARMIESBURG IN+ILEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Fluventic Hapludolls
TYPICAL PEDON: Armiesburg silty clay loam on a nearly level slope in a cultivated field. (Colors are for moist soils unless otherwise stated.)
Ap--0 to 8 inches; very dark grayish brown (10YR 3/2) silty clay loam, grayish brown (10YR 5/2) dry; moderate medium granular structure; friable; slightly alkaline; abrupt smooth boundary.
A--8 to 16 inches; very dark grayish brown (10YR 3/2) silty clay loam, grayish brown (10YR 5/2) dry; moderate medium angular blocky structure; firm; slightly alkaline; clear wavy boundary. (Combined thickness of A horizon is 10 to 20 inches.)
Bw1--16 to 24 inches; brown (10YR 4/3) silty clay loam; weak coarse prismatic structure parting to moderate medium subangular blocky; firm; common thin distinct very dark grayish brown (10YR 3/2) organic coatings on faces of peds; neutral; clear wavy boundary.
Bw2--24 to 38 inches; yellowish brown (10YR 5/4) silty clay loam; weak very coarse prismatic structure parting to weak coarse subangular blocky; firm; neutral; gradual wavy boundary. (Combined thickness of the Bw horizon is 15 to 40 inches.)
C--38 to 60 inches; brown (10YR 5/3) silty clay loam; massive; firm; neutral.
TYPE LOCATION: Knox County, Indiana; 2,800 feet south and 50 feet west of the northeast corner of sec. 28, T. 5 N., R. 7 W.
RANGE IN CHARACTERISTICS: The depth to the base of the cambic horizon is 35 to 60 inches. Organic-carbon content is 0.3 to 0.5 percent at a depth of 50 inches. The particle-size control section averages 25 to 35 percent clay. The mollic epipedon is 10 to 20 inches thick.
The upper part of the control section (Ap, A) has a hue of 10YR, value of 2 or 3, and chroma of 1 to 3. It is silt loam or silty clay loam. Reaction is moderately acid to slightly alkaline.
The middle part of the control section (Bw) has a hue of 10YR, value of 4 or 5, and chroma of 3 or 4. It is silty clay loam or silt loam in the upper part and includes clay loam in the lower part. Reaction is slightly acid to neutral. Some pedons have a BC horizon.
The lower part of the control section (C) has a hue of 10YR, value of 3 to 5, and chroma of 3 or 4. It is silty clay loam, silt loam, or loam. Reaction is slightly acid to slightly alkaline.
COMPETING SERIES: These are the Battleground, Huntington and Omadi series. Battleground and Omadi soils have carbonates throughout the series control section. Huntington soils average less than 30 percent clay in the middle part of the series control section (Bw) and often contain mica flakes.
GEOGRAPHIC SETTING: Armiesburg soils are on flood plains or flood plain steps. They are formed in alluvium. Slopes range from 0 to 2 percent. Mean annual temperature ranges from 50 to 57 degrees F, and mean annual precipitation ranges from 35 to 45 inches. Frost free period ranges from 150 to 210 days. Elevation ranges from 360 to 850 feet above sea level.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Haymond, Nolin, Petrolia, Proctor, and Ross soils. The well drained Haymond and Nolin soils are on similar landform positions and do not have a dark colored surface layer. The poorly drained Petrolia soils do not have a dark colored surface layer and are in backswamp positions. The well or moderately well drained Proctor soils are on stream terraces. The well drained Ross soils have a thicker surface layer and are on similar landform positions.
DRAINAGE AND PERMEABILITY: Well drained. Surface runoff potential is slow or very slow. Permeability is moderate.
USE AND VEGETATION: Most areas are used to grow corn and soybeans. The native vegetation is mixed, and consists of deciduous hardwood forests and prairie grasses.
DISTRIBUTION AND EXTENT: Central and southern Indiana and southeastern Illinois. The series is of moderate extent, and within MLRA's 115, 114, 113, and 111.
MLRA OFFICE RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Parke County, Indiana, 1965.
REMARKS: Diagnostic horizons and features recognized in this pedon are: Mollic epipedon - from the surface to 16 inches (Ap and A horizons). Cambic horizon - the zone from 16 to 38 inches (Bw1, Bw2). The organic carbon in the typical pedon is .46 percent at 50 inches.
ADDITIONAL DATA: Purdue Soil Characterization Laboratory S76IN83-19-(1-5) (typical pedon), S75IN83-3-(1-5), S74IN165-2-(1-5), S74IN165-3-(1-5), S76IN109-22-(1-6), S77IN21-29-(1-6), S79IN125-20-(1-7), S80IN55-9-(1-9), and NSSL S90IN-119-056