IDENTIFIERS

  • Current Taxon Name (Soil Name): Knobtop
  • OSD
  • Series Extent
  • User Site ID: 1997MO221102M
  • User Pedon ID: 1997MO221102
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - MCL
  • Lab Pedon # - M9722142
  • 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: 37.7449556
  • Std. Longitude: -90.9080750
  • Datum: WGS84
  • State: Missouri
  • County: MO221—Washington
  • MLRA: 116A—Ozark Highland

    • PEDON

  • Describers Name: DMS,JF,DM
  • Current Taxonomic Class: Fine-silty, mixed Typic Hapludults
  • Pedon Type: classifies to current taxon name, full description
  • Pedon Purpose: laboratory sampling site
  • Pedon Record Orgin: Converted from PDP 3.x
  • Sampled As Information:
  • Soil Name - Knobtop
  • Taxonomic Class - Fine-silty, mixed Typic Hapludults
  • Taxon Kind - series
  • PSC - 23 to 73 cm.
  • Classificaton Date - 10/16/1997
  • Moisture Class - udic
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: loess and/or residuum
  • Landscape: hills
  • Landform: knob
  • Slope Shape Across: convex
  • Slope Shape Down: convex
  • Drainage Class: well
  • Surface Fragments: 0.02 percent
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 10/16/1997 (actual site observation date)
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - grass/herbaceous cover
  • Site Obs. Cover Kind 2 - hayland
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
    • 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

    —

    —

    347

    —

    330

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    Ap—0 to 13 centimeters (0.0 to 5.1 inches); dark grayish brown (10YR 4/2), light gray (10YR 7/2), dry; silt loam; weak fine subangular blocky structure; friable; 6.0 very fine and fine roots; 3.0 very fine and fine interstitial and tubular pores; 5 percent by volume 2-39-75 millimeter igneous, acid fragments; neutral, pH 7.2, hellige-truog; clear smooth boundary. Lab sample # MU018721
    BE—13 to 23 centimeters (5.1 to 9.1 inches); 65 percent light yellowish brown (10YR 6/4) and 35 percent brownish yellow (10YR 6/6) silt loam; weak fine subangular blocky parts to moderate very fine subangular blocky structure; friable; 3.0 very fine and fine roots and 3.0 medium and coarse roots; 3.0 very fine and fine interstitial and tubular pores; 35 percent prominent silt coats on faces of peds; 5 percent by volume 2-39-75 millimeter igneous, acid fragments; strongly acid, pH 5.1, hellige-truog; clear smooth boundary. Lab sample # MU018722. discontinuous - phpvsfiid 138679; discontinuous - phpvsfiid 138679
    Bt1—23 to 38 centimeters (9.1 to 15.0 inches); yellowish brown (10YR 5/6) silty clay loam; weak medium prismatic parts to moderate fine subangular blocky structure; friable; 0.5 very fine and fine roots and 3.0 medium and coarse roots; 3.0 very fine and fine interstitial and tubular pores; 35 percent prominent clay films on faces of peds and 35 percent prominent silt coats on faces of peds; 5 percent by volume 2-39-75 millimeter igneous, acid fragments; very strongly acid, pH 4.9, hellige-truog; gradual smooth boundary. Lab sample # MU018723. patchy - phpvsfiid 138681; discontinuous - phpvsfiid 138680; patchy - phpvsfiid 138681; discontinuous - phpvsfiid 138680
    Bt2—38 to 58 centimeters (15.0 to 22.8 inches); yellowish brown (10YR 5/8) gravelly silty clay loam; weak coarse prismatic parts to moderate fine subangular blocky structure; firm; 0.5 very fine and fine roots; 6.0 very fine and fine interstitial and tubular pores; 35 percent prominent clay films on faces of peds; 10 percent by volume 2-39-75 millimeter igneous, acid fragments; very strongly acid, pH 4.8, hellige-truog; clear smooth boundary. Lab sample # MU018724. discontinuous - phpvsfiid 138682; discontinuous - phpvsfiid 138682
    Bt3—58 to 69 centimeters (22.8 to 27.2 inches); 70 percent yellowish brown (10YR 5/4) and 30 percent yellowish brown (10YR 5/8) very gravelly clay loam; 35 percent light brownish gray (10YR 6/2) fine prominent mottles; moderate fine subangular blocky structure; firm; 6.0 very fine and fine roots; 6.0 very fine and fine interstitial and tubular pores; 60 percent prominent clay films on faces of peds; 40 percent by volume 2-39-75 millimeter igneous, acid fragments; very strongly acid, pH 4.8, hellige-truog; abrupt smooth boundary. Lab sample # MU018725. discontinuous - phpvsfiid 138683; discontinuous - phpvsfiid 138683
    2Btx1—69 to 81 centimeters (27.2 to 31.9 inches); 85 percent light brownish gray (10YR 6/2) and 15 percent yellowish brown (10YR 5/8) very gravelly loam; moderate massive; extremely firm*; 0.5 very fine and fine interstitial and tubular pores; 60 percent prominent silt coats on faces of peds; 5 percent by volume 75-162-250 millimeter igneous, acid fragments and 60 percent by volume 2-39-75 millimeter igneous, acid fragments; very strongly acid, pH 4.8, hellige-truog; abrupt smooth boundary. Lab sample # MU018726. horizon appeared to be 100% brittle with no polygonal cracks or clay flows; discontinuous - phpvsfiid 138684; discontinuous - phpvsfiid 138684
    2R—81 centimeters (31.9 inches); bedrock; fragments.