IDENTIFIERS

  • Current Taxon Name (Soil Name): Knobtop
  • OSD
  • Series Extent
  • User Site ID: 1973MO093001S
  • User Pedon ID: S1973MO093001
  • Vegetation Plot ID: S1973MO093001
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 40A2685
  • NCSS Pedon Lab Data NASIS Record ID - 37269
  • Print Date: 2/16/2025

    • 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: 37.7264519
  • Std. Longitude: -90.8901215
  • Datum: WGS84
  • Township: T35N
  • Range: R1E
  • Section: 24
  • PLSS Details: about 250 feet southwest of the fire tower on top of Johnson Mountain, NW 1/4, SW 1/4
  • State: Missouri
  • County: MO093—Iron
  • Non-MLRA Soil Survey Area: MO093—Iron County, Missouri

    • PEDON

  • Describers Name: G. R. Landtiser
  • Pedon Type: OSD pedon
  • Pedon Record Orgin: Converted from PDP 3.x
  • Pedon #: 1
  • Sampled As Information:
  • Soil Name - Knobtop
  • Classificaton Date - 6/1/1973
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: residuum
  • Drainage Class: moderately well
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 6/1/1973 (actual site observation date)
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - tree cover
  • Site Obs. Cover Kind 2 - hardwoods
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
    • Vegetation Plot Plants
    Plant Symbol Scientific Name National Vernacular Name Plant Type Group Canopy Cover % Vegetation Stata Level

    CARYA

    QUERC

    Carya

    Quercus

    hybrid hickory

    oak

    —

    —

    —

    —

    —

    —
    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

    3

    —

    —

    512

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —
    Oi—0 to 5 centimeters (0.0 to 2.0 inches); dark grayish brown (10YR 4/2) silt loam; weak fine granular structure; very friable; 3.0 fine and medium roots; fragments; strongly acid, pH 5.3, unspecified; abrupt smooth boundary. Lab sample # 40A21054
    A—5 to 10 centimeters (2.0 to 3.9 inches); brown (10YR 5/3) silt loam; weak thin platy, and weak medium platy structure; very friable; 3.0 medium roots; fragments; very strongly acid, pH 4.8, unspecified; abrupt smooth boundary. Lab sample # 40A21055
    E—10 to 23 centimeters (3.9 to 9.1 inches); brown (7.5YR 5/4) silt loam; weak medium subangular blocky structure; friable; 3.0 medium roots; fragments; very strongly acid, pH 4.8, unspecified; clear smooth boundary. Lab sample # 40A21056
    Bt1—23 to 38 centimeters (9.1 to 15.0 inches); brown (7.5YR 4/4) silty clay loam; weak fine and medium subangular blocky structure; firm; 3.0 medium roots; fragments; very strongly acid, pH 4.8, unspecified; clear smooth boundary. Lab sample # 40A21057
    Bt2—38 to 58 centimeters (15.0 to 22.8 inches); brown (7.5YR 4/4) silty clay loam; 3 percent grayish brown (10YR 5/2) fine and medium distinct and 3 percent brown (10YR 5/3) fine and medium distinct mottles; weak medium subangular blocky structure; firm; 3.0 medium roots; 30 percent clay films on faces of peds; fragments; very strongly acid, pH 4.8, unspecified; clear smooth boundary. Lab sample # 40A21058
    Bt3—58 to 71 centimeters (22.8 to 28.0 inches); grayish brown (10YR 5/2) silty clay loam; 3 percent brown (7.5YR 4/4) medium prominent and 3 percent strong brown (7.5YR 5/8) medium prominent mottles; weak thick platy parts to weak fine subangular blocky structure; firm; 0.5 fine roots; 30 percent clay films on vertical faces of peds and 30 percent clay films in root channels and/or pores; fragments; very strongly acid, pH 4.8, unspecified; clear smooth boundary. Lab sample # 40A21059
    Bt4—71 to 81 centimeters (28.0 to 31.9 inches); silty clay loam; fragments.
    2BC—81 to 97 centimeters (31.9 to 38.2 inches); light brownish gray (2.5Y 6/2) silty clay loam; 3 percent yellowish red (5YR 4/6) medium prominent and 3 percent brown (7.5YR 4/4) medium prominent mottles; weak thick platy parts to weak medium subangular blocky structure; firm; 0.5 fine roots; fragments; very strongly acid, pH 4.8, unspecified; abrupt irregular boundary. Lab sample # 40A21060
    R—97 centimeters (38.2 inches); fragments. Lab sample # 40A21061