IDENTIFIERS

  • Current Taxon Name (Soil Name): Harco
  • OSD
  • Series Extent
  • User Site ID: 1990IL203020
  • User Pedon ID: 1990IL203020
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Print Date: 12/8/2025

    • LOCATION

  • Township: 26N
  • Range: 1W
  • Section: 3
  • PLSS Details: about 2,000 feet north & 168 feet east of the SW section corner: MLRA 108A
  • Location Description: Located about 3/4 mile north of US Route #24 in a very large Harco (484A) map unit as the Typical Pedon for Woodford County, Illinois

    • PEDON

  • Describers Name: Laura L. Merkel & Doug E. Liniger
  • Current Taxonomic Class: Fine-silty, mixed, superactive, mesic Aquic Argiudolls
  • Current Taxon Kind: series
  • Pedon Type: representative pedon for component
  • Pedon Purpose: soil survey inventory
  • Pedon Record Orgin: Pedon PC 6.1B
  • Correlated Information:
  • Soil Name - Harco
  • Classificaton Date - 6/3/2014
  • Soil Taxonomic Edition - eleventh edition
  • Moisture Subclass - aquic
  • Dynamic Soil Properties:
  • Erosion Class - 0
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: silty sediments
  • Landform: stream terrace
  • Drainage Class: somewhat poorly
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 5/30/2014 (actual site observation date)
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - crop cover
  • 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

    AB

    Bt1

    Bt2

    Btk

    Ck

    0

    28

    38

    61

    86

    102

    28

    38

    61

    86

    102

    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

    AB

    Bt1

    Bt2

    Btk

    Ck

    0

    28

    38

    61

    86

    102

    28

    38

    61

    86

    102

    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

    AB

    Bt1

    Bt2

    Btk

    Ck

    0

    28

    38

    61

    86

    102

    28

    38

    61

    86

    102

    152

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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

    1

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    230

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    890

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    170

    11

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    Ap—0 to 28 centimeters (0.0 to 11.0 inches); black (10YR 2/1), dark gray (10YR 4/1), dry; silty clay loam; moderate fine granular structure; friable; 3.0 very fine roots; fragments; neutral, pH 7.0; clear smooth boundary.
    AB—28 to 38 centimeters (11.0 to 15.0 inches); dark brown (10YR 3/3), brown (10YR 5/3), dry; silty clay loam; moderate medium granular structure; friable; 3.0 very fine roots; 75 percent distinct black (10YR 2/1) organic stains on all faces of peds; fragments; neutral, pH 7.2; clear smooth boundary. continuous - phpvsfiid 1323198; continuous - phpvsfiid 1323198
    Bt1—38 to 61 centimeters (15.0 to 24.0 inches); brown (10YR 4/3) silty clay loam; moderate fine subangular blocky structure; friable; 3.0 very fine roots; 10 percent prominent black (10YR 2/1) organic stains on surfaces along root channels and 75 percent distinct dark grayish brown (10YR 4/2) clay films on all faces of peds; 1 percent fine distinct yellowish brown (10YR 5/6) masses of oxidized iron in matrix and 1 percent fine faint grayish brown (10YR 5/2) iron depletions in matrix and 1 percent fine distinct irregular dark brown (7.5YR 3/3) iron-manganese masses with sharp boundaries throughout; fragments; neutral, pH 7.2; clear smooth boundary. continuous - phpvsfiid 1323199; continuous - phpvsfiid 1323200; continuous - phpvsfiid 1323199; continuous - phpvsfiid 1323200
    Bt2—61 to 86 centimeters (24.0 to 33.9 inches); brown (10YR 5/3) silty clay loam; moderate medium prismatic parts to moderate medium subangular blocky structure; friable; 0.8 very fine roots; 10 percent prominent black (10YR 2/1) organic stains on surfaces along root channels and 35 percent distinct dark grayish brown (10YR 4/2) clay films on all faces of peds; 1 percent fine distinct irregular dark brown (7.5YR 3/3) iron-manganese masses with clear boundaries throughout and 10 percent fine distinct yellowish brown (10YR 5/6) masses of oxidized iron in matrix and 10 percent fine faint grayish brown (10YR 5/2) iron depletions in matrix; fragments; neutral, pH 7.2; clear smooth boundary. continuous - phpvsfiid 1323201; continuous - phpvsfiid 1323202; continuous - phpvsfiid 1323201; continuous - phpvsfiid 1323202
    Btk—86 to 102 centimeters (33.9 to 40.2 inches); brown (10YR 5/3) silt loam; moderate coarse prismatic structure; friable; 0.8 very fine roots; 10 percent prominent black (10YR 2/1) organic stains on surfaces along root channels and 35 percent distinct dark grayish brown (10YR 4/2) clay films on vertical faces of peds; 1 percent fine distinct irregular dark brown (7.5YR 3/3) iron-manganese masses with clear boundaries throughout and 25 percent fine faint grayish brown (10YR 5/2) iron depletions in matrix and 25 percent fine distinct yellowish brown (10YR 5/6) masses of oxidized iron in matrix; 1 percent fine prominent spherical very pale brown (10YR 8/2), dry, carbonate concretions with sharp boundaries in matrix; fragments; slight effervescence; slightly alkaline, pH 7.6; clear smooth boundary. discontinuous - phpvsfiid 1323203; continuous - phpvsfiid 1323204; discontinuous - phpvsfiid 1323203; continuous - phpvsfiid 1323204
    Ck—102 to 152 centimeters (40.2 to 59.8 inches); yellowish brown (10YR 5/6) silt loam; massive; friable; 0.8 very fine roots top of horizon; 1 percent fine prominent irregular dark brown (7.5YR 3/3) iron-manganese masses with clear boundaries throughout and 25 percent fine prominent grayish brown (10YR 5/2) iron depletions in matrix; 10 percent fine prominent spherical very pale brown (10YR 8/2), dry, carbonate concretions with sharp boundaries in matrix; fragments; strong effervescence; slightly alkaline, pH 7.8.