LOCATION ROSATI MOEstablished Series
TAXONOMIC CLASS: Fine, mixed, active, mesic Aquic Fragiudalfs
TYPICAL PEDON: Rosati silt loam on a south facing slightly convex slope of 3 percent in a grape vineyard at an elevation of 1,065 feet. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 9 inches; dark brown (10YR 3/3) silt loam, brown (10YR 5/3) dry; weak very fine and fine subangular blocky structure; very friable; common very fine and fine roots and common medium; very fine tubular pores and fine tubular pores; slightly acid (pH 6.3); abrupt smooth boundary. (6 to 9 inches thick)
Bt--9 to 14 inches; brown (10YR 5/3) and reddish brown (5YR 4/4) silty clay; weak fine prismatic structure; firm; common very fine and fine roots and few medium and coarse; very fine and fine tubular pores; many distinct clay films on faces of peds and in pores; few fine iron-manganese concretions; very strongly acid (pH 4.9); clear wavy boundary. (0 to 9 inches thick)
Btg1--14 to 20 inches; grayish brown (10YR 5/2) silty clay; common fine and medium prominent red (2.5YR 4/6) masses of iron accumulation; moderate very fine and fine subangular blocky structure; friable; common very fine and fine roots and common medium and few coarse; very fine and fine tubular pores; many distinct clay films on faces of peds and in pores; few fine iron-manganese concretions; very strongly acid (pH 4.6); clear wavy boundary.
Btg2--20 to 29 inches; grayish brown (10YR 5/2) and dark grayish brown (10YR 4/2) silty clay; common medium distinct yellowish brown (10YR 5/6) masses of iron accumulation; moderate fine and medium prismatic structure; firm; common very fine roots and few fine to coarse; very fine and fine tubular pores; many distinct clay films on faces of peds and in pores; very strongly acid (pH 4.7); clear wavy boundary. (combined thickness of the Btg horizon is 8 to 20 inches)
2Btx1--29 to 36 inches; grayish brown (10YR 5/2) and yellowish brown (10YR 5/4) silt loam; moderate very coarse prismatic structure parting to weak thin platy and weak medium platy; firm; 75 percent brittle; light brownish gray (10YR 6/2) seams between prisms; common medium roots in mat at top of horizon and few coarse in mat at top of horizon and few very fine and fine between peds; very fine tubular pores; common faint clay films on faces of peds; 10 percent chert gravel; strongly acid (pH 5.1); abrupt wavy boundary.
2Btx2--36 to 41 inches; yellowish brown (10YR 5/4) and grayish brown (10YR 5/2) silt loam; moderate very coarse prismatic structure parting to weak thin platy and weak medium platy; firm; 60 percent brittle; light brownish gray (10YR 6/2) seams between prisms; few very fine and fine roots between peds; very fine tubular pores; few faint clay films on faces of peds; 10 percent chert gravel; strongly acid (pH 5.3); clear wavy boundary. (combined thickness of the 2Btx horizon is 7 to 22 inches)
3Bt1--41 to 50 inches; yellowish brown (10YR 5/6) and grayish brown (10YR 5/2) and light brownish gray (10YR 6/2) silty clay loam; weak coarse prismatic structure; firm; few very fine roots; very fine and fine tubular pores; few faint clay films on faces of peds and common patchy black (10YR 2/1) masses of manganese or iron-manganese accumulation; 10 percent chert gravel; moderately acid (pH 5.8); gradual wavy boundary.
3Bt2--50 to 66 inches; yellowish brown (10YR 5/6) and brown (10YR 5/3) and light brownish gray (10YR 6/2) silty clay loam; weak medium and coarse prismatic structure; friable; few very fine roots; very fine and fine tubular pores; few faint clay films on faces of peds and common patchy black (10YR 2/1), moist, manganese or iron-manganese stains; 10 percent chert gravel; moderately acid (pH 6.0); gradual wavy boundary.
3Bt3--66 to 80 inches; yellowish brown (10YR 5/8) and pale brown (10YR 6/3) and grayish brown (10YR 5/2) gravelly silty clay loam; weak coarse prismatic structure; firm; few faint clay films on faces of peds and few distinct clay films on faces of peds and common patchy black (10YR 2/1), moist, manganese or iron-manganese stains; 15 percent chert gravel; moderately acid (pH 5.9).
TYPE LOCATION: Phelps County, Missouri; about 2 miles northeast of Saint James; 2,375 feet south and 2,645 feet east of the northwest corner of section 10, T. 38 N., R. 6 W.; USGS Rosati, Missouri topographic quadrangle; latitude 38 degrees 1 minute 42.9 seconds N., longitude 91 degrees 34 minutes 17.4 seconds W.; UTM zone 15, 625,373 m. easting and 4,209,950 northing, NAD 83.
RANGE IN CHARACTERISTICS:
Depth to bedrock: more than 80 inches
Depth to fragipan: 20 to 35 inches
Particle size control section: averages 40 to 57 percent clay
A horizon:
Rock fragments: 0
Hue: 10YR
Value: 2 or 3
Chroma: 2 or 3
Texture: silt loam
Reaction: slightly acid to neutral
Bt horizon:
Rock fragments: 0 to 5 percent gravel
Hue: 5YR to 10YR
Value: 3 to 5
Chroma: 3 or 4
Texture: silty clay loam or silty clay
Reaction: very strongly acid to strongly acid
Btg horizon:
Rock fragments: 0 to 5 percent gravel
Hue: 10YR
Value: 4 to 6
Chroma: 1 or 2
Texture: silty clay loam or silty clay
Reaction: very strongly acid to strongly acid
2Btx horizon:
Rock fragments: 0 to 80 percent gravel
Hue: 10YR
Value: 4 to 6
Chroma: 2 to 4
Texture: silt loam
Reaction: very strongly acid to moderately acid
2Bt horizon (where present):
Rock fragments: 0 to 15 percent gravel
Hue: 10YR
Value: 4 to 6
Chroma: 2 to 8
Texture: silt loam or silty clay loam
Reaction: very strongly acid to moderately acid
3Bt horizon :
Rock fragments: 0 to 15 percent gravel
Hue: 10YR
Value: 4 to 6
Chroma: 1 to 8
Texture: silty clay loam or silty clay
Reaction: strongly acid to moderately acid
COMPETING SERIES: This is the Plato series. Plato soils do not have a mollic colored surface layer.
GEOGRAPHIC SETTING: Rosati soils are on gently sloping broad upland divides. Slopes range from 1 to 5 percent. They formed in loess and the underlying pedisediment and residuum. Average annual temperature ranges from 53 to 57 degrees F. and average annual precipitation ranges from 42 to 46 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the Beemont, Glensted, Plato, and Union soils. Beemont soils are deep to sandstone bedrock and are on hillslopes. Glensted soils do not have a fragipan and are on similar postions as Rosati soils. They are slightly less sloping and are plane to slightly concave. Plato and Union soils do not have a dark colored surface horizon and are on similar positions.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained. The surface runoff index is low to medium. Permeability is moderatly slow above the fragipan, very slow in the fragipan, and moderatly slow below the fragipan. The saturated hydraulic conductivity is low.
USE AND VEGETATION: Nearly all areas have been cleared. They are used for hay, pasture, and as grape vineyards. Native vegetation was prairie grass with scattered trees.
DISTRIBUTION AND EXTENT: The Ozark Highlands region (MLRA 116A) of east central Missouri. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES ESTABLISHED: Phelps County, Missouri, 1999.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
ochric epipedon - the zone from the surface to a depth of 9 inches (Ap horizon);
argillic horizon - the zone from 9 to 29 and 41 to 80 inches. (Bt, Btg, and the 3Bt horizons);
fragipan - the zone from 29 to 41 inches. (2Btx horizons)
ADDITIONAL DATA: University of Missouri soil characterization laboratory number M9016116.