IDENTIFIERS

  • Current Taxon Name (Soil Name): Knobtop
  • OSD
  • Series Extent
  • User Site ID: 1991MO123035M
  • User Pedon ID: 1991MO123035M
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - MCL
  • Lab Pedon # - M9112335
  • NCSS Pedon Lab Data NASIS Record ID - 27225
  • 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: 37.4646378
  • Std. Longitude: -90.2150574
  • Datum: WGS84
  • Township: T32N
  • Range: R8E
  • Section: 18
  • PLSS Details: 650 feet S and 50 feet E of the NW corner
  • Location Description: 650 ft. S. and 50 ft. E. of the NW corner of sec. 18, T. 32 N., R. 8 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-D2—Marquand, Missouri

    • PEDON

  • Describers Name: KEB, RDC and CGM, MLC
  • 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 - 31 to 61 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 - 31 to 61 cm.
  • Classificaton Date - 10/9/1991
  • Dynamic Soil Properties:
  • Erosion Class - 1
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no
  • Field Measured Properties: 56 Cation exchange capacity to clay ratio


    • SITE

  • Parent Material: loess over solid rock derived from acid igneous rock
  • Landscape: mountains
  • Landform: ridge
  • Runoff: medium
  • Drainage Class: moderately well
  • Bedrock: igneous, acid
  • Surface Fragments: 2.00 percent
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 10/9/1991 (actual site observation date)
  • Air Photo ID: D-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

    —

    61 -

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

    ochric epipedon

    argillic horizon

    lithic contact

    3—31

    31—61

    61—

    —-

    —-

    —-
    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

    4

    —

    —

    332

    —

    210

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —
    Oi—0 to 3 centimeters (0.0 to 1.2 inches); slightly decomposed plant material; fragments.
    A—3 to 13 centimeters (1.2 to 5.1 inches); brown (10YR 5/3), pale brown (10YR 6/3), dry; silt loam; 10 percent yellowish brown (10YR 5/4) fine faint mottles; weak fine subangular blocky parts to moderate fine granular structure; friable; 0.5 medium roots and 10.0 fine roots; 5 percent by volume 75-162-250 millimeter unspecified fragments; very strongly acid, pH 4.8, hellige-truog; clear wavy boundary. Lab sample # MU015059. mottling was mixing from below horizon.
    BE—13 to 31 centimeters (5.1 to 12.2 inches); yellowish brown (10YR 5/4) silt loam; 10 percent yellowish brown (10YR 5/6) medium faint mottles; moderate very fine and fine subangular blocky parts to weak fine granular structure; friable; 10.0 fine and medium roots; 15 percent faint clay films; 5 percent by volume 75-162-250 millimeter unspecified fragments; very strongly acid, pH 4.6, hellige-truog; clear wavy boundary. Lab sample # MU015060
    Bt1—31 to 46 centimeters (12.2 to 18.1 inches); strong brown (7.5YR 5/6) silty clay loam; 1 percent light yellowish brown (10YR 6/4) medium distinct and 10 percent yellowish brown (10YR 5/6) medium distinct mottles; moderate very fine and fine subangular blocky structure; friable; 3.0 fine and medium roots; 35 percent distinct clay films; 15 percent by volume 75-162-250 millimeter unspecified fragments; very strongly acid, pH 4.7, hellige-truog; clear wavy boundary. Lab sample # MU015061
    Bt2—46 to 61 centimeters (18.1 to 24.0 inches); strong brown (7.5YR 5/6) very cobbly silty clay loam; 1 percent brownish yellow (10YR 6/6) medium distinct and 30 percent light yellowish brown (10YR 6/4) medium prominent mottles; moderate fine subangular blocky structure; friable; 3.0 fine and medium roots; 4 percent distinct iron stains and 35 percent distinct clay films; 1 percent fine masses of oxidized iron and 10 percent coarse noncoherent cemented light brownish gray (10YR 6/2) iron depletions; 50 percent by volume 75-162-250 millimeter unspecified fragments; very strongly acid, pH 4.7, hellige-truog. Lab sample # MU015062
    2R—61 centimeters (24.0 inches); bedrock; fragments.