LOCATION HARVESTER MO
Established Series
Rev. RJH-RET-RSA
06/2026
HARVESTER SERIES
Depth class: Very deep
Drainage class: Moderately well drained
Saturated hydraulic conductivity: Moderately high to high
Parent material: Human-transported material mostly derived from nearby loess deposits and overlies Peoria loess, where it is present.
Geomorphic location: Leveled land and fills on hillslopes and interfluves
Slope range: 0 to 30 percent
Mean annual temperature: 12 degrees C
Mean annual precipitation: 1050 millimeters
TAXONOMIC CLASS: Fine-silty, spolic, mixed, superactive, nonacid, mesic Anthroportic Udorthents
TYPICAL PEDON: Harvester silt loam, 5 percent slope on a residential lot under sod grass on 5 percent slope in an area reshaped by heavy equipment. (Colors are for moist soil unless otherwise noted.)
^Au--0 to 10 centimeters; very dark grayish brown (10YR 3/2) silt loam; weak fine subangular blocky structure; friable; common very fine and fine roots throughout; common fine tubular and interstitial pores; 1 percent gravel-sized plastic artifacts, 2 percent gravel-sized concrete artifacts, 2 percent elongated gravel-sized glass artifacts, and 2 percent gravel-sized asphalt artifacts; neutral (pH 6.6); clear smooth boundary (4 to 22 cm thick)
^Cu1--10 to 27 centimeters; 60 percent dark yellowish brown (10YR 3/4) and 20 percent very dark grayish brown (10YR 3/2) and 20 percent yellowish brown (10YR 5/4) silt loam; massive; friable; common very fine roots throughout; common very fine interstitial and fine tubular pores; 3 percent gravel-sized asphalt artifacts and 4 percent gravel-sized concrete artifacts; neutral (pH 6.9); clear smooth boundary
^Cu2--27 to 45 centimeters; 60 percent dark yellowish brown (10YR 3/4) and 40 percent very dark gray (10YR 3/1) silt loam; massive; friable; common very fine roots throughout; common very fine interstitial pores; 4 percent gravel-sized concrete artifacts; neutral (pH 6.6); clear smooth boundary
^Cu3--45 to 57 centimeters; 70 percent very dark grayish brown (10YR 3/2) and 30 percent strong brown (7.5YR 4/6) gravelly-artifactual silty clay loam; massive; friable; common very fine interstitial pores; 2 percent limestone gravel; 2 percent gravel-sized asphalt artifacts and 14 percent gravel-sized concrete artifacts; slightly acid(pH 6.4); clear smooth boundary
^Cu4--57 to 75 centimeters; 85 percent very dark grayish brown (10YR 3/2) and 15 percent dark yellowish brown (10YR 3/4) silt loam; massive; friable; common very fine irregular and interstitial pores, and common fine tubular pores; 2 percent gravel-sized asphalt artifacts; neutral (pH 7.1); abrupt smooth boundary (Combined thickness of ^C horizons is 50 or more thick)
2Btb1--75 to 87 centimeters; brown (10YR 4/3) silt loam; weak fine subangular blocky structure; friable; common very fine roots throughout; common very fine tubular, vesicular, and interstitial pores; neutral (pH 7.2), clear smooth boundary
2Btb2--87 to 110 centimeters; brown (10YR 4/3) silty clay loam; weak medium subangular blocky structure; firm; common very fine vesicular pores; 8 percent fine faint irregular grayish brown (10YR 5/2) iron depletions in matrix; slightly alkaline (pH 7.4); clear smooth boundary
2Btb3--110 to 148 centimeters; dark yellowish brown (10YR 4/4) silty clay loam; moderate coarse prismatic structure; firm; common very fine vesicular pores; 5 percent fine prominent irregular black (10YR 2/1) manganese coatings in matrix, 10 percent fine distinct irregular strong brown (7.5YR 4/6) iron-manganese masses in matrix, and 20 percent fine distinct irregular gray (10YR 5/1) iron depletions in matrix; neutral (pH 7.0); clear smooth boundary
2Btb4--148 to 186 centimeters; dark yellowish brown (10YR 4/6) silty clay loam; moderate coarse prismatic structure; firm; common very fine vesicular pores; 10 percent prominent white (10YR 8/1), dry, silt coats on all faces of peds; 3 percent fine prominent irregular black (10YR 2/1) manganese coatings in matrix, 8 percent fine faint irregular strong brown (7.5YR 4/6) iron-manganese masses in matrix, and 30 percent fine prominent irregular gray (10YR 5/1) iron depletions in matrix; neutral (pH 7.0); gradual smooth boundary
2Btb5--186 to 220 centimeters; dark yellowish brown (10YR 4/6) silty clay loam; weak coarse prismatic structure; firm; common very fine vesicular pores; 6 percent prominent white (10YR 8/1), dry, silt coats on all faces of peds; 12 percent fine faint irregular strong brown (7.5YR 4/6) iron-manganese masses in matrix and 16 percent fine prominent irregular grayish brown (10YR 5/2) iron depletions in matrix; neutral (pH 6.9)
TYPE LOCATION:
St Louis County, Missouri; 30 feet west and 100 feet north of the intersection of Mackland and Loughborough Avenues in a residential lot.
USGS Quadrangle: Webster Groves
Latitude: 38.5721090
Longitude: -90.2879270
Datum: WGS84
Coordinate source: From hand-held GPS
RANGE IN CHARACTERISTICS:
Thickness of human-transported materials: 55 to 200 centimeters
Depth to bedrock: Greater than 200 centimeters
Depth to seasonal High-water table: 55 to 100 centimeters
Soil reaction: Slightly acid to moderately alkaline (6.1 to 8.3 pH)
Particle-size control section (weighted average):
Clay content--18 to 35 percent
Sand content--2 to 15 percent
Artifact content--0 to 10 percent
Combined rock and artifact content: 0 to 10 percent
^A(u) horizons:
Hue--10YR
Value--3 or 4
Chroma--1 to 3
Texture--silt loam
Rock fragment content--0 to 5 percent
Artifact content--0 to 5 percent
^C(u) horizons:
Hue--10YR or 7.5YR
Value--3 to 4
Chroma--1 to 6
Texture--silt loam or silty clay loam
Rock fragments--0 to 5 percent
Artifact content--0 to 10 percent
2Btb horizons:
Hue--10YR or 7.5YR
Value--4 or 5
Chroma--3 to 6
Texture--silt loam or silty clay loam
COMPETING SERIES: These are the
Rapatee soils.
Rapatee soils formed in reclaimed surface mine materials, do not have buried argillics, and are greater than 100 centimeters to a seasonal high-water table
GEOGRAPHIC SETTING:
Parent material: Human-transported material over loess
Landscape: Loess hills
Landform: Interfluves, ridges, shoulders, and backslopes in the loess hills
Anthropogenic landform: Leveled land and fills
Slope: 2 to 30 percent
Elevation: 120 to 250 meters
Frost-free period: 184 to 228 days
Mean annual temperature: 11 to 14 degrees C
Mean annual precipitation: 940 to 1194 millimeters
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Fishpot,
Shaw, Vandeventer and
Winfield soils.
Fishpot soils are on terraces that have been leveled, have aquic conditions within 50 centimeters, and formed in human-transported material over alluvium.
Shaw soils are on nearby leveled or filled interfluves, have aquic conditions within 40 centimeters, and have a mollic epipedon.
Vandeventer soils are on nearby leveled hillslopes or interfluves and have between 35 to 80 percent human artifacts in the particle-size control section.
Winfield soils are on nearby loess hills and did not form in human-transported materials.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage Class: Moderately well drained
Surface Runoff: Medium
Saturated Hydraulic Conductivity Class: Moderately high except where compacted
Flooding: None
Ponding: None
USE AND VEGETATION:
Major uses are for residential, commercial, and recreational applications in an urban setting. Vegetation may include managed and unmanaged plant communities with a mix of native and non-native species. Many areas are vegetated with non-native ornamental landscaping or turfgrass. Some areas exhibit weedy, invasive, and primary succession vegetation communities (e.g., abandoned lots and other unmanaged areas).
DISTRIBUTION AND EXTENT:
Urban and other areas with human-modified landscapes in the Central Feed Grains and Livestock Region, Major Land Resource Area 115. These soils are of moderate extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Raleigh, North Carolina (Special Projects Office)
SERIES ESTABLISHED:
St Louis County, Missouri, 1979
REMARKS:
Typical Pedon Taxonomic Features:
Ochric epipedon--The zone from 0 to 10 centimeters
Human-transported material--The zone from 0 to 75 cm
Lithologic discontinuity--At a depth of 75 centimeters
Particle-size control section--The zone from 25 to 100 centimeters
Taxonomic Version: Keys to Soil Taxonomy, 13th Edition (2022)
Other: Areas of Harvester soils occur in areas of deep loess deposits that have been modified by earth-moving equipment. The amount of filling, cutting, and alteration of existing soil is variable from place to place. The Harvester soil series was originally classified as Oxyaquic Udorthents. This classification has been updated to reflect the human artifacts and human-transported material that are described. In the City of St. Louis area, some pedons may have aquic conditions closer to the surface and are included in the concept of this soil.
ADDITIONAL DATA:
NASIS User Pedon ID: 2024MO510090
National Cooperative Soil Survey
U.S.A.