LOCATION DOCKERY MO+IA ILEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, nonacid, mesic Aquic Udifluvents
TYPICAL PEDON: Dockery silt loam - on a nearly level slope in a cultivated field at an elevation of 815 feet. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 8 inches; dark grayish brown (10YR 4/2) silt loam, grayish brown (10YR 5/2) dry; weak very fine granular structure; friable; few fine roots; slightly acid; abrupt smooth boundary. (4 to 12 inches thick)
C--8 to 15 inches; stratified very dark grayish brown (10YR 3/2), dark grayish brown (10YR 4/2), and grayish brown (10YR 5/2) silt loam; massive; friable; few fine roots; slightly acid; gradual smooth boundary.
Cg1--15 to 24 inches; stratified very dark grayish brown (10YR 3/2), dark grayish brown (10YR 4/2), and grayish brown (10YR 5/2) silt loam; few fine distinct dark yellowish brown (10YR 4/6) stains on horizonal bedding planes and root pores in the lower part; massive; friable; few fine roots; neutral; clear smooth boundary.
Cg2--24 to 30 inches; stratified dark gray (10YR 4/1), very dark gray (10YR 3/1), and grayish brown (10YR 5/2) silt loam; massive; many coarse prominent dark reddish brown (2.5YR 2.5/4) mottles and stains on horizonal bedding planes and root pores; friable; few fine roots; neutral; clear smooth boundary.
Cg3--30 to 60 inches; stratified dark gray (10YR 4/1) and very dark gray (10YR 3/1) silt loam; massive; friable; few fine roots; slightly acid.
TYPE LOCATION: Platte County, Missouri; about 2 miles southwest of Edgerton; 900 feet north and 1,950 feet west of the southeast corner of sec. 24, T. 54 N., R. 34 W.; Camden Point quadrangle.
RANGE IN CHARACTERISTICS: The Ap or A horizon has hue of 10YR, value of 2 to 4, 4 to 6 dry and chroma of 2 or 3. It is silt loam or silty clay loam and moderately acid to neutral.
The C horizon has hue of 10YR to 5Y, value of 3 to 6 and chroma of 1 to 3. Iron masses have hue of 2.5YR to 10YR, value of 4 to 6 and chroma of 2 to 8. Texture typically is silt loam or silty clay loam. Some pedons are loam or sandy loam below a depth of 36 inches. It is moderately acid in the upper part to moderately alkaline in the lower part. Carbonates occur below depths of 20 inches in some pedons. Some pedons have a clayey substratum.
COMPETING SERIES: There are no competing series. Similar soils are the Blake, Gilliam, and Nodaway series. Blake and Gilliam soils contain free carbonates above 20 inches. Nodaway soils do not have mottles with chroma of 2 or less within 20 inches of the surface.
GEOGRAPHIC SETTING: Dockery soils are on flood plains and formed in alluvium. Slope gradients are 0 to 5 percent. The mean annual temperature ranges from 50 to 57 degrees F, and mean annual precipitation ranges from 32 to 42 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the better drained Napier soils as well as the more poorly drained Colo, Portage, Wabash and Zook soils. Napier soils are on adjacent foot slopes and alluvial fans. Colo, Portage, Wabash and Zook soils are on slightly lower positions on the flood plains.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained. Runoff is slow. Permeability is moderate or moderately slow. An apparent water table has its upper limit at a depth of 1.5 to 2.5 feet during November to June in most years. These soils are subject to rare or common flooding.
USE AND VEGETATION: Most areas are cleared and used to grow cultivated crops. Native vegetation is mixed woodland.
DISTRIBUTION AND EXTENT: Northern Missouri and southern Iowa. The series is of large extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Lafayette County, Missouri, 1970.
REMARKS: Diagnostic horizons and features recognized in this series are: ochric epipedon - the zone from the surface of the soil to a depth of 8 inches (Ap horizon). Fluventic feature - an irregular decrease in organic matter.
These soils are prime farmland except where frequently flooded during the growing season.