LOCATION KENMOOR MO+IAEstablished Series
TAXONOMIC CLASS: Sandy over clayey, mixed, superactive, calcareous, mesic Aquic Udifluvents
TYPICAL PEDON: Kenmoor loamy fine sand - on a level flood plain under cultivation. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 6 inches; dark grayish brown (10YR 4/2) loamy fine sand, light brownish gray (10YR 6/2) dry; weak fine granular structure; very friable; common fine roots; neutral; abrupt smooth boundary. (4 to 10 inches thick)
C--6 to 28 inches; stratified grayish brown (10YR 5/2) loamy fine sand and fine sand; single grain; loose; common fine roots; strong effervescence; slightly alkaline; abrupt smooth boundary. (10 to 34 inches thick)
2Ab--28 to 37 inches; very dark grayish brown (10YR 3/2) silty clay; moderate fine and very fine angular and subangular blocky structure; firm; few fine roots; slight effervescence; slightly alkaline; clear smooth boundary. (0 to 12 inches thick)
2Bgb--37 to 67 inches; dark grayish brown (10YR 4/2) silty clay; moderate medium angular blocky structure; firm; common medium prominent yellowish brown (10YR 5/6) masses of iron accumulation throughout; strong effervescence; slightly alkaline.
TYPE LOCATION: Carroll County, Missouri; 250 feet north and 60 feet east of the southwest corner of sec. 11, T. 51 N., R. 24 W.
RANGE IN CHARACTERISTICS: The solum corresponds to the thickness of the A horizon. Depth to the 2Ab horizon ranges from 20 to 38 inches. Reaction is slightly alkaline or moderately alkaline, but may be neutral in the surface layer.
The Ap horizon has color value of 3 to 5, and chroma of 2 to 4. Color value of 3 and chroma of 3 or less do not extend below depths of 7 inches. It is loam, fine sandy loam, sandy loam, loamy fine sand, or loamy sand. Where present, an A or AC horizon has hue of 10YR to 5Y, value of 4 or 5, and chroma of 2 or 3.
The C horizon has hue of 10YR to 5Y, value of 4 to 6, and chroma of 2 or 3. The horizon below depths of 10 inches and above the 2A horizon is loamy fine sand, sand, or fine sand.
The 2A and 2B horizons have hue of 10YR to 5Y, value of 2 to 5, and chroma of 1 to 4. Few and common fine yellowish brown and grayish brown redoximorphic features are mixed throughout many pedons. These horizons are clay, silty clay, clay loam, or silty clay loam averaging more than 35 percent clay.
COMPETING SERIES: There are no competing series. Soils that are similar are the Modale, Moville, Sarpy and Waubonsie series. Modale and Moville soils are coarse-silty over clayey. Sarpy soils lack contrasting textures. Waubonsie soils are coarse-loamy over clayey.
GEOGRAPHIC SETTING: Kenmoor soils are on nearly level flood plains of major streams. They typically are near the stream channel where coarse alluvium is deposited on clayey materials. Slope gradients range from 0 to 3 percent. The mean annual temperature ranges from 52 to 57 degrees F., and the mean annual precipitation ranges from 34 to 40 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Haynie, Leta, Modale, Sarpy, Waldron, and Waubonsie soils. Haynie, Leta, and Waldron soils have more silt and clay in the upper part of the particle size control section. Haynie soils are at higher elevations and occupy positions further back from the stream. Leta and Waldron soils are at lower elevations and occupy positions farther back from the stream. Modale and Waubonsie soils are at similar elevations and occupy similar positions. Sarpy soils occupy positions close to the stream.
DRAINAGE AND PERMEABILITY: Moderately well drained. Runoff is slow. Permeability is rapid in the sandy upper mantle and slow in the underlying clayey material. Flooding is rare or occasional. In undisturbed areas, an apparent water table has an upper limit of 2.0 to 3.0 feet during November to June in most years.
USE AND VEGETATION: Most areas are cleared and utilized the same way as adjoining soils. These soils are used to grow corn, wheat, and soybeans, or are used for hay and pasture. Native vegetation is mostly willow, cottonwood and oak trees.
DISTRIBUTION AND EXTENT: Missouri and Iowa. These soils are of small extent.
MLRA OFFICE RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Harrison County, Iowa, 1971.
REMARKS: Diagnostic horizons and features recognized in this series are: ochric epipedon- the zone from the surface of the soil to a depth of 6 inches (Ap horizon). Kenmoor soils do not seem to have a wetness problem during much of the growing season. In fact, droughtiness is a problem even though the finer-textured material underneath is wet for periods of time.