LOCATION FREEBURG MOEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Aquic Hapludalfs
TYPICAL PEDON: Freeburg silt loam - on a 1 percent slightly concave south-facing slope in a cultivated field at an elevation of 750 feet. (Colors are for moist soils unless otherwise stated.)
Ap--0 to 7 inches; dark grayish brown (10YR 4/2) silt loam; light brownish gray (10YR 6/2) dry; strong fine granular structure; very friable; neutral; abrupt smooth boundary. (6 to 10 inches thick)
E--7 to 12 inches; brown (10YR 5/3) silt loam; moderate fine granular structure; very friable; neutral; clear smooth boundary. (0 to 10 inches thick)
Bt1--12 to 19 inches; yellowish brown (10YR 5/4), dark grayish brown (10YR 4/2), and dark yellowish brown (10YR 4/4) silty clay loam; moderate medium subangular blocky structure; friable; few faint clay films on faces of peds; few fine iron and manganese concretions; the areas of dark grayish brown are iron depletions; moderately acid; gradual wavy boundary.
Bt2--19 to 30 inches; brown (10YR 5/3) and yellowish brown (10YR 5/4) clay loam; coatings of light brownish gray (10YR 6/2) on faces of peds; strong medium and coarse angular blocky structure; firm; many faint dark yellowish brown clay films on faces of peds; few fine iron and manganese concretions; very strongly acid; gradual smooth boundary. (Combined thickness of the Bt horizons is 12 to 70 inches.)
BCg1--30 to 48 inches; gray (10YR 5/1) silty clay loam; moderate medium and coarse subangular blocky structure; friable; many medium distinct yellowish brown (10YR 5/4) masses of iron accumulation throughout; common fine iron and manganese concretions; strongly acid; gradual smooth boundary. (10 to 20 inches thick)
BCg2--48 to 60 inches; gray (10YR 5/1) silty clay loam; weak medium subangular blocky structure; friable; many medium yellowish brown (10YR 5/6) masses of iron accumulation throughout; common fine iron and manganese concretions; strongly acid.
TYPE LOCATION: Howard County, Missouri; about 4 miles northwest of Bunker Hill; 1200 feet south and 1700 feet east of the northwest corner, sec. 35, T. 52 N., R. 15 W; USGS Higbee quadrangle, latitude 39 degrees 15 minutes 46 seconds N. and longitude 92 degrees 34 minutes 21 seconds W.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 40 to 60 inches or more. The upper 20 inches of the argillic horizon averages 18 to 35 percent clay. Reaction is very strongly acid to neutral throughout.
The Ap horizon has value of 3 to 5, and chroma of 2 or 3. Some pedons have a very dark grayish brown A horizon 1 to 5 inches thick. The E horizon has hue of 10YR, value of 4 to 7, and chroma of 2 to 4. They are silt loam or loam.
The Bt horizon has hue of 10YR or 7.5YR, value of 4 or 5, and chroma of 3 to 6 with few to common iron depletions with chroma of 2 or less, or it has no clear matrix and a mixture of these colors containing less than 30 percent chroma of 2 or less. It is silt loam, silty clay loam, or clay loam.
The Btg horizon (where present) is multicolored with hue of 10YR or 7.5YR, value of 4 to 6 and chroma of 1 to 6. It is silty clay loam, silt loam, or clay loam.
The BCg horizon and Cg horizons, (where present) have hue of 10YR or 7.5YR, value 4 or 5, and chroma of 1 or 2 with common or many distinct iron accumulations of higher chroma. They are silty clay loam, clay loam, or silt loam.
COMPETING SERIES: These are the Appleriver, Blair, Fishhook, Geff, Glenford, Henshaw, Higdon, Ingersoll, Keene, Lykens, Muren, Reesville, Torox, Travilah, and Xenia soils. Appleriver soils have a paralithic contact from 45 to 60 inches. Blair soils have gray colors that are considered to be relict and not due to an aquic moisture regime. Bunkum soils have less than 7 percent sand in the particle size control section. Fishhook soils contain more clay in the lower part of the solum. Geff soils average less than 10 percent sand in the upper part of the series control section. Glenford soils do not have matrix colors dominated by chroma of 2 or less in the lower part of the solum. Henshaw soils typically are less acid and have free carbonates at a depth of 30 to 60 inches. Ingersoll soils have thinner sola and have free carbonates at 10 to 24 inches. Keene soils formed in colluvial deposits of residuum from interbedded siltstone, shale, coal, and thin layers of limestone and have shale fragments in the lower part of the Bt horizons. Lykens soils have firm glacial till at a depth of 20 to 40 inches are less acid in the lower part of the solum and contain free carbonates at a depth of 28 to 50 inches. Muren soils formed in 6 to 12 feet thick deposits of loess on uplands and lack matrix colors with chroma of 2 or less in the lower part of the solum and C horizon. Torox soils have free carbonates at 36 to 60 inches. Travilah soils have bedrock at depths of 20 to 40 inches. Xenia soils formed in thin loess deposits 22 to 40 inches thick and the underlying firm glacial till and contain free carbonates at a depth of 40 to 60 inches.
GEOGRAPHIC SETTING: The Freeburg soils occur on nearly level to gently sloping stream terraces and floodplains along small streams and creeks, and upland footslopes. They formed in alluvial sediments washed from loess or glacial till soils of the nearby uplands. Slopes commonly are from 0 to 4 percent but range to 9 percent. The mean annual temperature ranges from 54 to 59 degrees F, and mean annual precipitation ranges from 31 to 41 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Chariton, Lindley, Mandeville, Moniteau, Nodaway, Westerville, and Winfield soils. The moderately well drained Lindley and Winfield, and the moderately deep Mandeville soils are on adjacent uplands. The fine-textured Chariton soils and the poorly drained Moniteau soils are on similar landscapes. The well drained Nodaway and the poorly drained Westerville soils are on adjacent flood plains.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained. Surface runoff is low to medium. Permeability is moderately slow. A perched water table has an upper limit of 1.0 to 2.5 feet during November to May in most years. Low areas of these soils are subject to occasional or rare flooding.
USE AND VEGETATION: Corn, soybeans, and wheat are the principal row crops. Some areas are used for hay and pasture or remain wooded. Native vegetation is hardwood forests.
DISTRIBUTION AND EXTENT: Central and southern Missouri. They are of moderate extent.
MLRA OFFICE RESPONSIBLE: Little Rock, Arkansas
SERIES ESTABLISHED: Lawrence County, Illinois, 1952.
REMARKS: Diagnostic horizons and features recognized in this series are:
ochric epipedon - the zone from the surface of the soil to a depth of 12 inches (Ap and E horizons);
argillic horizon - the zone from approximately 12 to 30 inches (Bt and Bt2 horizons).