LOCATION MONITEAU MOEstablished Series
The Moniteau series consists of very deep, poorly drained, moderately slowly permeable soils formed in alluvium. These soils are on flood plains and have slopes of 0 to 5 percent. Mean annual temperature is about 54 degrees F., and mean annual precipitation is about 36 inches.
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Typic Endoaqualfs
TYPICAL PEDON: Moniteau silt loam - on a 1 percent slope in a cultivated field. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 7 inches; dark grayish brown (10YR 4/2) silt loam, light gray (10YR 7/2) dry; weak fine granular structure; friable; many fine roots in upper 3 inches and common roots in lower 4 inches; few fine iron-manganese concretions; slightly acid; clear smooth boundary.
Eg--7 to 14 inches; light brownish gray (10YR 6/2) silt loam, very pale brown (10YR 8/2) dry; moderate medium platy structure parting to weak very fine granular; friable; common fine roots; common fine distinct dark yellowish brown (10YR 4/4) and yellowish brown (10YR 5/4) masses of iron accumulation in ped interiors; common fine iron-manganese concretions; moderately acid; clear smooth boundary. (Combined thickness of the A and E horizons is 10 to 24 inches.)
Btg1--14 to 18 inches; light brownish gray (10YR 6/2) silty clay loam; moderate fine and medium angular blocky structure; firm; few fine roots; root channels lined with clay films; common fine distinct yellowish brown (10YR 5/4) masses of iron accumulation and few fine faint dark gray (10YR 4/1) iron depletions in ped interiors; common fine iron-manganese concretions and soft masses of iron-manganese oxides; strongly acid; clear smooth boundary.
Btg2--18 to 27 inches; gray (10YR 6/1) silty clay loam; moderate medium subangular blocky structure; firm; few fine roots; few root channels lined with distinct clay films; few faint clay films on faces of peds; common fine prominent yellowish brown (10YR 5/6) masses of iron accumulation in ped interiors; common fine soft masses of iron-manganese oxides; very strongly acid; gradual smooth boundary.
Btg3--27 to 42 inches; grayish brown (2.5Y 5/2) silty clay loam; weak medium prismatic structure parting to weak fine angular blocky; firm; few fine roots; few root channels lined with clay films; few faint clay films on faces of peds; common fine prominent yellowish brown (10YR 5/6) and distinct dark yellowish brown (10YR 4/4) masses of iron accumulation in ped interiors; few fine iron-manganese concretions; very strongly acid; gradual smooth boundary.
Btg4--42 to 60 inches; gray (2.5Y 5/1) silty clay loam; weak medium prismatic structure parting to weak fine subangular blocky; firm; few fine roots; few root channels lined with clay films; few faint clay films on vertical faces of peds; many fine prominent yellowish brown (10YR 5/6) and dark yellowish brown (10YR 4/4) masses of iron accumulation in ped interiors; common fine soft masses of iron-manganese oxides; strongly acid; gradual smooth boundary.
TYPE LOCATION: Howard County, Missouri; about 5 miles northeast of Fayette; 1,300 feet north and 375 feet west of the southeast corner of sec. 19, T. 51 N., R. 15 W.
RANGE IN CHARACTERISTICS: Depth to the base of the argillic horizon ranges from 36 to 60 inches or more. The particle-size control section
averages between 27 and 35 percent clay and 5 to 15 percent fine sand or coarser. The base of the albic horizon is less than 24 inches.
The A or Ap horizon has value of 4 or 5, 6 or 7 dry and chroma of 1 to 3. The E horizon has value of 4 to 7 and chroma of 1 or 2. Reaction is very strongly acid to neutral.
The Btg horizon and Cg horizon, where present, have hue of 10YR to 5Y, value of 4 to 6, and chroma of 1 or 2. Iron masses have hue of 7.5YR to 5Y, value of 4 to 6, and chroma of 1 to 6. Texture is silty clay loam or silt loam. Reaction is very strongly acid to slightly acid.
Some pedons have a silty clay 2Btg horizon in the lower part of the series control section.
COMPETING SERIES: This is the Racoon series. Racoon soils are more than 24 inches to the base of the albic horizon.
GEOGRAPHIC SETTING: Moniteau soils are on flood plains and formed in alluvium. Slope commonly ranges from 0 to 3 percent, but may range to 5
percent. The mean annual temperature ranges from 50 to 56 degrees F., and mean annual precipitation ranges from 35 to 40 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the moderately well drained Nodaway, the somewhat poorly drained Auxvasse and Westerville soils, and the poorly drained Blackoar and Pioplis soils. Auxvasse soils have an abrupt textural change between the E and B horizons and are in similar positions. Blackoar, Nodaway, Piopolis, and Westerville soils do not have an argillic horizon, are stratified, and are on lower flood plains.
DRAINAGE AND PERMEABILITY: Poorly drained. Runoff is slow. Permeability is moderately slow. In undisturbed areas there is an apparent water table that has an upper limit of 0 to 1 foot during November to May in most years.
USE AND VEGETATION: Most areas are used for cultivated crops or pasture. Native vegetation is mixed hardwoods.
DISTRIBUTION AND EXTENT: Central and North Missouri. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Livingston County, Missouri, 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 14 inches (Ap and E horizons); albic horizon - the zone from approximately 7 to 14 inches (E horizon); argilllic horizon - the zone from approximately 14 to 60 inches (Btg1, Btg2, Btg3 and Btg4 horizons).