IDENTIFIERS

  • Current Taxon Name (Soil Name): Knobtop
  • OSD
  • Series Extent
  • User Site ID: 1988MO123006M
  • User Pedon ID: 1988MO123006M
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - MCL
  • Lab Pedon # - M8812306
  • NCSS Pedon Lab Data NASIS Record ID - 31421
  • Print Date: 11/21/2024

    • LOCATION

  • Location In Web Soil Survey
  • AOI is roughly a square mile and pedon is marked in the center.
  • Location in SoilWeb
  • Location in Google Maps
  • Std. Latitude: 37.4900818
  • Std. Longitude: -90.4282761
  • Datum: WGS84
  • Township: T32N
  • Range: R6E
  • Section: 6
  • PLSS Details: 2000 feet S and 2300 feet E of the NW corner
  • Location Description: 2000 ft. S. and 2300 ft. E. of the NW corner of sec. 6, T. 32 N., R. 6 E.
  • Map Unit: 77009—Trackler silt loam, 3 to 8 percent slopes94C—Knobtop silt loam, 3 to 9 percent slopes
  • State: Missouri
  • County: MO123—Madison
  • MLRA: 116A—Ozark Highland
  • Non-MLRA Soil Survey Area: MO123—Madison County, Missouri
  • 7.5 Minute USGS Quad: 37090-D4—Rock Pile Mountain, Missouri

    • PEDON

  • Describers Name: RM, JF, and BLB
  • Current Taxonomic Class: Fine-loamy, mixed, active, mesic Aquic Hapludults
  • Current Taxon Kind: taxadjunct
  • Pedon Type: map unit inclusion
  • Pedon Purpose: laboratory sampling site
  • Pedon Record Orgin: Converted from PDP 3.x
  • Correlated Information:
  • Soil Name - Knobtop
  • PSC - 18 to 68 cm.
  • Classificaton Date - 1/31/2012
  • Moisture Class - udic
  • Sampled As Information:
  • Soil Name - Knobtop
  • Taxonomic Class - Fine-silty, mixed, active, mesic Aquic Hapludults
  • Taxon Kind - series
  • PSC - 18 to 68 cm.
  • Classificaton Date - 5/17/1988
  • Dynamic Soil Properties:
  • Erosion Class - 1
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: loess over residuum weathered from acid igneous rock
  • Landscape: mountains
  • Landform: ridge
  • Runoff: medium
  • Drainage Class: moderately well
  • Surface Fragments: 0.05 percent
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 5/17/1988 (actual site observation date)
  • Air Photo ID: B-5
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - tree cover
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
  • Site Erosion Accelerated: water erosion
    • Pedon Restrictions
    Kind Hardness Restriction Depth L-H Restriction Thickness L-RV-H
    cm

    bedrock, lithic

    —

    84 -

    —
    Pedon Diagnostic Features
    Feature Kind Feature Depth L-H Feature Thickness L-RV-H
    cm

    ochric epipedon

    argillic horizon

    lithic contact

    0—18

    18—84

    84—

    —-

    —-

    —-
    Setting and Climate
    Slope Slope Length USLE Upslope Length Elev. Corr. Elev Aspect MAP REAP FFD MAAT MSAT MWAT MAST MSST MWST MFFP PE Index Climate Station ID Climate Station Name Climate Station Type
    % m degrees mm mm C mm

    5

    —

    —

    250

    —

    135

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —
    A—0 to 8 centimeters (0.0 to 3.1 inches); brown (10YR 4/3) and very dark grayish brown (10YR 3/2), pale brown (10YR 6/3) and grayish brown (10YR 5/2), dry; silt loam; moderate fine and medium granular structure; friable; 10.0 fine and medium roots; 3 percent by volume 75-162-250 millimeter unspecified fragments; very strongly acid, pH 4.8, hellige-truog; clear smooth boundary. Lab sample # MU033682
    E—8 to 18 centimeters (3.1 to 7.1 inches); yellowish brown (10YR 5/6) silt loam; moderate medium subangular blocky structure; friable; 10.0 fine and medium roots and 0.5 coarse roots; 1 percent by volume 2-39-75 millimeter unspecified fragments; very strongly acid, pH 4.5, hellige-truog; clear smooth boundary. Lab sample # MU033683
    Bt1—18 to 33 centimeters (7.1 to 13.0 inches); strong brown (7.5YR 4/6) silt loam; moderate medium and coarse subangular blocky structure; friable; 10.0 fine and medium roots and 0.5 coarse roots; clay films and 15 percent black stains; 3 percent by volume 2-39-75 millimeter unspecified fragments; very strongly acid, pH 4.7, hellige-truog; gradual smooth boundary. Lab sample # MU033684. continuous - phpvsfiid 161894; continuous - phpvsfiid 161894
    Bt2—33 to 51 centimeters (13.0 to 20.1 inches); strong brown (7.5YR 5/6) silty clay loam; weak medium prismatic parts to moderate medium subangular blocky structure; firm; 10.0 fine and medium roots and 3.0 coarse roots; clay films on vertical faces of peds; 3 percent by volume 2-39-75 millimeter unspecified fragments; very strongly acid, pH 4.8, hellige-truog; clear smooth boundary. Lab sample # MU033685. continuous - phpvsfiid 161896; continuous - phpvsfiid 161896
    2Bt3—51 to 61 centimeters (20.1 to 24.0 inches); strong brown (7.5YR 4/6) cobbly silty clay loam; moderate medium subangular blocky structure; firm; 10.0 fine and medium roots and 0.5 coarse roots; clay films on faces of peds; 1 percent fine and medium noncoherent cemented grayish brown (10YR 5/2) iron depletions; 15 percent by volume 2-39-75 millimeter unspecified fragments and 20 percent by volume 75-162-250 millimeter unspecified fragments; very strongly acid, pH 4.7, hellige-truog; clear smooth boundary. Lab sample # MU033686. continuous - phpvsfiid 161897; continuous - phpvsfiid 161897
    2Bt4—61 to 84 centimeters (24.0 to 33.1 inches); strong brown (7.5YR 5/6) extremely cobbly silt loam; 10 percent yellowish red (5YR 4/6) medium distinct mottles; moderate fine subangular blocky structure; firm; 3.0 fine and medium roots; 1 percent fine dark concretions and 30 percent very coarse and extremely coarse noncoherent cemented light brownish gray (10YR 6/2) iron depletions; 25 percent by volume 2-39-75 millimeter unspecified fragments and 50 percent by volume 75-162-250 millimeter unspecified fragments; very strongly acid, pH 4.7, hellige-truog; clear wavy boundary. Lab sample # MU033687
    2R—84 centimeters (33.1 inches); bedrock; fragments.