IDENTIFIERS

  • Current Taxon Name (Soil Name): Kniffin
  • OSD
  • Series Extent
  • User Site ID: S1969IA185001
  • User Pedon ID: S1969IA185001
  • Vegetation Plot ID: S1969IA185001
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 40A1488
  • NCSS Pedon Lab Data NASIS Record ID - 35096
  • 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: 40.5944443
  • Std. Longitude: -93.3955536
  • Datum: WGS84
  • Township: 67N
  • Range: 22W
  • Section: 16
  • PLSS Details: 60 feet north and 750 feet east of the southwest corner of the SE1/4SW1/4
  • State: Iowa
  • County: IA185—Wayne
  • MLRA: 109—Iowa and Missouri Heavy Till Plain
  • Non-MLRA Soil Survey Area: IA185—Wayne County, Iowa

    • PEDON

  • Describers Name: J.D. Highland, J.R. Culver, and T.E. Fenton
  • Current Taxonomic Class: Fine, smectitic, mesic Udollic Ochraqualfs
  • Current Taxon Kind: series
  • Pedon Type: OSD pedon
  • Pedon Record Orgin: Converted from PDP 3.x
  • Pedon #: 1
  • Correlated Information:
  • Soil Name - Kniffin
  • PSC - 36 to 86 cm.
  • Classificaton Date - 7/23/2007
  • Moisture Class - udic
  • Moisture Subclass - udic
  • Sampled As Information:
  • Soil Name - Kniffin
  • Classificaton Date - 11/3/1969
  • Dynamic Soil Properties:
  • Erosion Class - 1
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: loess
  • Geomorphic Component Hills: interfluve
  • Slope Shape Down: convex
  • Drainage Class: somewhat poorly
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 11/3/1969 (actual site observation date)
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - grass/herbaceous cover
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
  • Site Erosion Accelerated: water erosion
    • Vegetation Plot Plants
    Plant Symbol Scientific Name National Vernacular Name Plant Type Group Canopy Cover % Vegetation Stata Level

    POA

    Poa

    bluegrass

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    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

    2

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    A1—0 to 15 centimeters (0.0 to 5.9 inches); very dark gray (10YR 3/1), gray (10YR 5/1), dry; silt loam; moderate fine subangular blocky parts to moderate fine granular structure; friable; fragments; strongly acid, pH 5.3, unspecified; clear smooth boundary. Lab sample # 40A11593
    A2—15 to 23 centimeters (5.9 to 9.1 inches); very dark grayish brown (10YR 3/2) and very dark grayish brown (10YR 3/2) rubbed silty clay loam; weak fine subangular blocky, and weak fine granular structure; friable; dark grayish brown (10YR 4/2) coats on faces of peds and faint gray (10YR 6/1), dry, silt coats and 15 percent dark brown (7.5YR 3/2) oxide coats; 1 percent very dark gray (10YR 3/1) worm casts; fragments; very strongly acid, pH 4.8, unspecified; clear smooth boundary. Lab sample # 40A11594. patchy - phpvsfiid 175299; patchy - phpvsfiid 175299
    A1—18 to 28 centimeters (7.1 to 11.0 inches); dark grayish brown (10YR 4/2) silt loam; weak coarse platy parts to weak very fine subangular blocky structure; friable; 15 percent very dark gray (10YR 3/1) coats on faces of peds and 15 percent dark reddish brown (5YR 2/2) oxide coats; fragments; strongly acid, pH 5.3, unspecified; clear smooth boundary. Lab sample # 40A11604. satellite Kniffin site - 330 ft. N-NE of prime site.
    B1—23 to 36 centimeters (9.1 to 14.2 inches); dark grayish brown (10YR 4/2) and dark grayish brown (2.5Y 4/2) rubbed silty clay; 1 percent dark yellowish brown (10YR 4/4) fine faint mottles; moderate very fine subangular blocky structure; firm; very dark grayish brown (10YR 3/2) coats on faces of peds and gray (10YR 6/1), dry, silt coats on horizontal faces of peds and 15 percent dark brown (7.5YR 3/2) oxide coats; 1 percent very dark gray (10YR 3/1) worm casts; fragments; very strongly acid, pH 4.8, unspecified; clear smooth boundary. Lab sample # 40A11595. discontinuous - phpvsfiid 175301; discontinuous - phpvsfiid 175301
    B21t—36 to 46 centimeters (14.2 to 18.1 inches); dark grayish brown (10YR 4/2) silty clay; 1 percent strong brown (7.5YR 5/6) fine distinct and 25 percent yellowish brown (10YR 5/6) fine prominent mottles; moderate fine angular blocky, and moderate fine subangular blocky structure; very firm; prominent very dark gray (10YR 3/1) clay films and 15 percent dark brown (7.5YR 3/2) oxide coats; 1 percent very dark gray (10YR 3/1) worm casts; fragments; strongly acid, pH 5.3, unspecified; gradual smooth boundary. Lab sample # 40A11596. discontinuous - phpvsfiid 175304; discontinuous - phpvsfiid 175304
    B21t—41 to 51 centimeters (16.1 to 20.1 inches); dark grayish brown (10YR 4/2) silty clay; 10 percent yellowish brown (10YR 5/6) fine distinct mottles; moderate very fine subangular blocky structure; very firm; prominent very dark gray (10YR 3/1) clay films on faces of peds and 15 percent dark brown (7.5YR 3/2) oxide coats; fragments; strongly acid, pH 5.3, unspecified; gradual smooth boundary. Lab sample # 40A11605. satellite Kniffin site - 330 ft. N-NE of prime site.; continuous - phpvsfiid 175320; continuous - phpvsfiid 175320
    B22t—46 to 58 centimeters (18.1 to 22.8 inches); dark grayish brown (10YR 4/2) silty clay; 10 percent strong brown (7.5YR 5/6) fine distinct and 25 percent yellowish brown (10YR 5/6) fine prominent mottles; moderate fine angular blocky, and moderate fine subangular blocky structure; very firm; prominent dark gray (10YR 4/1) clay films and 15 percent dark reddish brown (5YR 3/2) oxide coats; fragments; strongly acid, pH 5.3, unspecified; gradual smooth boundary. Lab sample # 40A11597. discontinuous - phpvsfiid 175306; discontinuous - phpvsfiid 175306
    B23t—58 to 71 centimeters (22.8 to 28.0 inches); grayish brown (2.5Y 5/2) silty clay; 25 percent yellowish brown (10YR 5/4) fine prominent and 25 percent yellowish brown (10YR 5/8) fine prominent and 25 percent strong brown (7.5YR 5/6) fine prominent mottles; weak coarse prismatic parts to moderate medium subangular blocky structure; very firm; faint clay films on faces of peds and 15 percent dark reddish brown (5YR 3/2) oxide coats; fragments; moderately acid, pH 5.8, unspecified; gradual smooth boundary. Lab sample # 40A11598. deoxidized and leached weathering zone.; discontinuous - phpvsfiid 175308; discontinuous - phpvsfiid 175308
    B31t—71 to 89 centimeters (28.0 to 35.0 inches); olive gray (5Y 5/2) and yellowish brown (10YR 5/6) clay loam; weak coarse prismatic parts to weak medium and coarse angular blocky structure; firm; dark grayish brown (10YR 4/2) on faces of peds and 15 percent clay films and 15 percent dark reddish brown (5YR 2/2) black stains on faces of peds and 55 percent dark reddish brown (5YR 3/2) oxide coats; fragments; slightly acid, pH 6.3, unspecified; gradual smooth boundary. Lab sample # 40A11599. deoxidized and leached weathering zone.; discontinuous - phpvsfiid 175310; discontinuous - phpvsfiid 175310
    B32t—89 to 114 centimeters (35.0 to 44.9 inches); olive gray (5Y 5/2) and yellowish brown (10YR 5/6) and strong brown (7.5YR 5/6) and yellowish brown (10YR 5/4) rubbed silty clay loam; weak coarse prismatic structure; firm; 15 percent clay films on faces of peds and 55 percent dark reddish brown (5YR 3/2) oxide coats; fragments; slightly acid, pH 6.3, unspecified; gradual wavy boundary. Lab sample # 40A11600. deoxidized and leached weathering zone.; discontinuous - phpvsfiid 175314; discontinuous - phpvsfiid 175314
    B33—114 to 132 centimeters (44.9 to 52.0 inches); gray (5Y 6/1) and yellowish brown (10YR 5/4) rubbed silty clay loam; 1 percent reddish brown (5YR 4/4) fine prominent and 25 percent strong brown (7.5YR 5/8) fine prominent mottles; weak coarse prismatic structure; friable; 55 percent dark reddish brown (5YR 3/2) oxide coats; fragments; neutral, pH 6.9, unspecified; gradual smooth boundary. Lab sample # 40A11601. deoxidized and leached weathering zone.
    B34—132 to 160 centimeters (52.0 to 63.0 inches); dark grayish brown (2.5Y 4/2) and light brownish gray (2.5Y 6/2) and dark yellowish brown (10YR 4/4) silt loam; weak fine and medium platy structure; friable; 15 percent very dark gray (10YR 3/1) black stains on faces of peds; fragments; neutral, pH 6.9, unspecified; gradual smooth boundary. Lab sample # 40A11602. occasional charcoal flecks.
    C—160 to 180 centimeters (63.0 to 70.9 inches); dark yellowish brown (10YR 4/4) silt loam; 10 percent light brownish gray (2.5Y 6/2) fine prominent mottles; massive; fragments. Lab sample # 40A11603. silt loam high in sand; occasional charcoal flecks.