IDENTIFIERS

  • Current Taxon Name (Soil Name): Clarksdale
  • OSD
  • Series Extent
  • User Site ID: S1978IL095053
  • User Pedon ID: S1978IL095053
  • Lab Information:
  • Certified Lab Pedon Description - yes
  • Lab Source ID - IL SCL
  • Lab Pedon # - 78IL095053
  • NCSS Pedon Lab Data NASIS Record ID - 21023
  • Print Date: 2/17/2025

    • 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: 41.0199640
  • Std. Longitude: -90.1898250
  • Datum: WGS84
  • Township: 12N
  • Range: 3E
  • Section: 17
  • PLSS Details: 1,056 feet E & 198 feet N of the SW corner
  • Map Unit: 257A—Clarksdale silt loam, 0 to 2 percent slopes
  • Country: US—United States
  • State: Illinois
  • County: IL095—Knox
  • MLRA: 115—Central Mississippi Valley Wooded Slopes
  • Regional Office: NC—North Central
  • MLRA Soil Survey Area: NC-SPI—Springfield, Illinois
  • Non-MLRA Soil Survey Area: IL095—Knox County, Illinois
  • 7.5 Minute USGS Quad: 41090-A2—Oneida, Illinois

    • PEDON

  • Describers Name: Roger D. Windhorn
  • Current Taxonomic Class: Fine, smectitic, mesic Udollic Endoaqualfs
  • Current Taxon Kind: series
  • Pedon Type: classifies to current taxon name, full description
  • Pedon Purpose: soil survey inventory
  • Pedon Record Orgin: PedonPC
  • Pedon #: 53
  • Correlated Information:
  • Soil Name - Clarksdale
  • PSC - 25 to 75 cm.
  • Classificaton Date - 1/4/2010
  • Soil Taxonomic Edition - twelfth edition
  • Moisture Class - aquic
  • Moisture Subclass - aeric
  • Sampled As Information:
  • Soil Name - Clarksdale
  • PSC - 25 to 75 cm.
  • Classificaton Date - 10/1/1978
  • Dynamic Soil Properties:
  • Erosion Class - 1
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: Fine-textured Peoria Loess
  • Landscape: upland
  • Landform: ground moraine, hillslope
  • Runoff: low
  • Drainage Class: somewhat poorly
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 10/1/1978 (actual site observation date)
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - crop cover
  • Site Obs. Cover Kind 2 - row crop
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
    • Pedon Horizon Lab Results - 1
    Horizon Top Depth Bottom Depth Sample ID Data Collector Total Clay CaCO3 Clay Total Silt Fine Silt Co. Silt Total Sand Total Sand Method VC Sand Co. Sand Med. Sand Fine Sand VF Sand VF Sand Method Texture Class - Field Lab Rubbed Fiber Unrubbed Fiber pH H2O
    cm cm % % % % % % % % % % % % %

    Ap

    E

    Bt1

    Bt2

    Btg

    Cg

    0

    18

    25

    41

    58

    107

    18

    25

    41

    58

    107

    152

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    Pedon Horizon Lab Results - 2
    Horizon Top Depth Bottom Depth Sample ID pH CaCl2 pH NaF pH Ox Delta pH LL PL PI Atter. Samp. Cond. COLE Pot. Acidity Ca + Mg - Meh 2 K Ca + Mg - Sat. Paste KCl Extract. Acidity Base Sat. - Meh 2 CEC-7 CEC-8.2
    cm cm % % % cm/cm meq/100g cmol(+)/kg cmol(+)/kg mmol(+)/l cmol(+)/kg % cmol(+)/kg cmol(+)/kg

    Ap

    E

    Bt1

    Bt2

    Btg

    Cg

    0

    18

    25

    41

    58

    107

    18

    25

    41

    58

    107

    152

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    Pedon Horizon Lab Results - 3
    Horizon Top Depth Bottom Depth Sample ID ECEC Phosphate P NO3-N EC EC Method EC 1:5 by volume CaCO3 Equiv. Equiv. Gypsum Na SAR Gypsum Req. Humic Color Fulvic Color Humic + Fulvic Color Al PI Pyro. Hue PyrO. Value Pyro. Chroma
    cm cm cmol(+)/kg mg/kg mg/kg dS/m dS/m % % mmol(+)/l % L-pcu/g L-pcu/g L-pcu/g %

    Ap

    E

    Bt1

    Bt2

    Btg

    Cg

    0

    18

    25

    41

    58

    107

    18

    25

    41

    58

    107

    152

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

    ochric epipedon

    argillic horizon

    0—25

    25—107

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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

    3

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    245

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    Ap—0 to 18 centimeters (0.0 to 7.1 inches); 90 percent very dark grayish brown (10YR 3/2) and 10 percent dark grayish brown (10YR 4/2), grayish brown (10YR 5/2), dry; silt loam; mottles; weak fine subangular blocky parts to moderate medium granular structure; friable; common (4.0) very fine roots between peds; 1 percent fine distinct irregular pale brown (10YR 6/3), moist, masses of oxidized iron with sharp boundaries in matrix; fragments; slightly acid, pH 6.5; abrupt smooth boundary. Lab sample # IL25721
    E—18 to 25 centimeters (7.1 to 9.8 inches); dark grayish brown (10YR 4/2), light brownish gray (10YR 6/2), dry; silty clay loam; and mottles; weak thin platy, and weak medium platy structure; friable; few (0.5) very fine roots between peds; 10 percent distinct very dark grayish brown (10YR 3/2), moist, organoargillans on all faces of peds; 1 percent fine faint irregular light brownish gray (10YR 6/2), moist, iron depletions with clear boundaries in matrix and 1 percent fine prominent irregular yellowish brown (10YR 5/6), moist, masses of oxidized iron with clear boundaries in matrix and 25 percent prominent cylindrical light gray (10YR 7/2), dry, clay depletions with sharp boundaries on faces of peds; fragments; moderately acid, pH 5.7; abrupt smooth boundary. Lab sample # IL25722. continuous - phpvsfiid 1414275; continuous - phpvsfiid 1414275
    Bt1—25 to 41 centimeters (9.8 to 16.1 inches); brown (10YR 5/3) silty clay loam; and mottles; moderate fine prismatic parts to moderate fine angular blocky structure; firm; few (0.5) very fine roots between peds; 25 percent distinct very dark grayish brown (10YR 3/2), moist, organoargillans on all faces of peds and 25 percent faint brown (7.5YR 4/2), moist, clay films on all faces of peds; 1 percent fine faint irregular light brownish gray (10YR 6/2), moist, iron depletions with sharp boundaries in matrix and 10 percent fine distinct irregular yellowish brown (10YR 5/6), moist, masses of oxidized iron with sharp boundaries in matrix; fragments; strongly acid, pH 5.5; abrupt smooth boundary. Lab sample # IL25723. continuous - phpvsfiid 1414270; continuous - phpvsfiid 1414269; continuous - phpvsfiid 1414270; continuous - phpvsfiid 1414269
    Bt2—41 to 58 centimeters (16.1 to 22.8 inches); brown (10YR 5/3) silty clay; and mottles; moderate fine prismatic parts to strong fine subangular blocky structure; firm; few (0.5) very fine roots between peds; 25 percent prominent very dark grayish brown (10YR 3/2), moist, organoargillans on surfaces along root channels and 25 percent distinct dark grayish brown (10YR 4/2), moist, clay films on all faces of peds; 1 percent fine prominent spherical very dark brown (7.5YR 2.5/2), moist, iron-manganese concretions with sharp boundaries throughout and 1 percent fine faint irregular light brownish gray (10YR 6/2), moist, iron depletions with clear boundaries in matrix and 10 percent medium distinct irregular yellowish brown (10YR 5/6), moist, masses of oxidized iron with clear boundaries in matrix; fragments; strongly acid, pH 5.5; abrupt smooth boundary. Lab sample # IL25724. continuous - phpvsfiid 1414267; continuous - phpvsfiid 1414268; continuous - phpvsfiid 1414267; continuous - phpvsfiid 1414268
    Btg—58 to 107 centimeters (22.8 to 42.1 inches); grayish brown (2.5Y 5/2) silty clay loam; and mottles; weak fine prismatic parts to moderate fine subangular blocky structure; friable; few (0.5) very fine roots between peds; 10 percent prominent very dark gray (10YR 3/1), moist, organoargillans on surfaces along root channels and 25 percent distinct brown (10YR 4/3), moist, clay films on all faces of peds; 1 percent fine prominent spherical very dark brown (7.5YR 2.5/2), moist, iron-manganese concretions with sharp boundaries throughout and 10 percent fine faint irregular light brownish gray (10YR 6/2), moist, iron depletions with diffuse boundaries in matrix and 10 percent medium prominent irregular yellowish brown (10YR 5/6), moist, masses of oxidized iron with diffuse boundaries in matrix; fragments; neutral, pH 7.0; clear smooth boundary. Lab sample # IL25725. continuous - phpvsfiid 1414274; continuous - phpvsfiid 1414273; continuous - phpvsfiid 1414274; continuous - phpvsfiid 1414273
    Cg—107 to 152 centimeters (42.1 to 59.8 inches); light brownish gray (10YR 6/2) silt loam; massive; friable; very few (0.1) very fine roots between peds; 10 percent prominent very dark gray (10YR 3/1), moist, organoargillans on surfaces along pores; 1 percent fine prominent spherical very dark brown (7.5YR 2.5/2), moist, iron-manganese concretions with sharp boundaries throughout and 10 percent fine prominent irregular dark brown (7.5YR 3/3), moist, iron-manganese masses with diffuse boundaries in matrix and 25 percent medium prominent irregular yellowish brown (10YR 5/8), moist, masses of oxidized iron with diffuse boundaries in matrix; fragments; slight effervescence; moderately alkaline, pH 8.2. Lab sample # IL25726. continuous - phpvsfiid 1414276; continuous - phpvsfiid 1414276