IDENTIFIERS

  • Current Taxon Name (Soil Name): Irwin
  • OSD
  • Series Extent
  • User Site ID: 05KS161005
  • User Pedon ID: 05KS161005
  • User Site Association ID: Irwin, Ladysmith, Dwight, Konza DeAnn Presley PhD studyKansas State University Laboratory PedonsKSU _ Presley dissertation
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - KSU
  • Lab Pedon # - 05KS161005
  • NCSS Pedon Lab Data NASIS Record ID - 40802
  • Print Date: 4/17/2025

    • 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: 39.4149284
  • Std. Longitude: -96.7709579
  • Datum: WGS84
  • Township: 7S
  • Range: 6E
  • Section: 28
  • PLSS Details: S 1/2 of NW 1/4
  • Location Description: Site is located one mile south of the town of Randolph, Kansas.
  • Map Unit: 4625—Dwight-Irwin complex, 1 to 3 percent slopes
  • State: Kansas
  • County: KS161—Riley
  • MLRA: 76—Bluestem Hills
  • Non-MLRA Soil Survey Area: KS161—Riley County, Kansas
  • 7.5 Minute USGS Quad: 39096-D7—Randolph, Kansas

    • PEDON

  • Describers Name: DeAnn Presley
  • Current Taxonomic Class: Fine, smectitic, mesic Pachic Argiustolls
  • Current Taxon Kind: family
  • Pedon Type: not classified to current taxon name
  • Pedon Purpose: research site
  • Pedon Record Orgin: NASIS
  • Sampled As Information:
  • Soil Name - Irwin
  • Taxonomic Class - Fine, smectitic, mesic Pachic Argiustolls
  • PSC - 22 to 72 cm.
  • Classificaton Date - 7/9/2005
  • Moisture Class - ustic
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Parent Material: clayey loess over colluvium over colluvium over calcareous shale residuum
  • Landscape: upland
  • Landform: hillside
  • Geomorphic Component Hills: interfluve
  • Hill Slope Profile: shoulder
  • Slope Position: middle third
  • Slope Complexity: complex
  • Slope Shape Across: convex
  • Slope Shape Down: linear
  • Runoff: high
  • Drainage Class: moderately well
  • Flooding: none flooding
  • Ponding: none ponding
  • Bedrock: at 246cm
  • Geology: Chase group .
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 7/9/2005 (actual site observation date)
  • Surface Water Kind: none observed
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - grass/herbaceous cover
  • Site Obs. Cover Kind 2 - rangeland, grassland
  • Pedoderm Loose Cover Indicator - no
  • Drained? - no
  • Bedded Soil? - no
  • Forest Plantation? - no
    • Pedon Diagnostic Features
    Feature Kind Feature Depth L-H Feature Thickness L-RV-H
    cm

    mollic epipedon

    abrupt textural change

    argillic horizon

    redox concentrations

    secondary carbonates

    paralithic contact

    0—80

    22—25

    22—246

    41—246

    80—116

    246—

    —80—

    —3—

    —224—

    —-

    —36—

    —-
    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

    —

    —

    394

    —

    338

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —
    A—0 to 22 centimeters (0.0 to 8.7 inches); very dark gray (10YR 3/1) exterior, black (10YR 2/1) rubbed, moist; silty clay loam; 3 percent sand; 30 percent clay; moderate medium granular structure; slightly hard, friable, moderately sticky, moderately plastic; very slow permeability; 5.0 fine roots throughout; 5.0 fine dendritic tubular pores; fragments; noneffervescent, by hcl, 1n; clear smooth boundary. Lab sample # KSUR0908; observed in push tube
    Bt1—22 to 41 centimeters (8.7 to 16.1 inches);, very dark grayish brown (10YR 3/2) exterior, moist; silty clay; 3 percent sand; 50 percent clay; moderate medium granular, and weak fine subangular blocky structure; very hard, very firm, very sticky, very plastic; very slow permeability; 5.0 fine roots throughout; 5.0 fine dendritic tubular pores; 2 percent faint very dark brown (10YR 2/2), moist, organoargillans on all faces of peds; fragments; noneffervescent, by hcl, 1n; clear smooth boundary. Lab sample # KSUR0909; observed in push tube. discontinuous - phpvsfiid 313561; discontinuous - phpvsfiid 313561
    Bt2—41 to 80 centimeters (16.1 to 31.5 inches);, dark brown (10YR 3/3) exterior, moist; silty clay; 3 percent sand; 46 percent clay; moderate fine prismatic structure; very hard, very firm, very sticky, very plastic; very slow permeability; 1.0 very fine roots between peds; 1.0 fine irregular pores; 10 percent faint very dark grayish brown (10YR 3/2), moist, clay films on all faces of peds; 5 percent fine black (N 2.5/0), moist, iron-manganese nodules; fragments; noneffervescent, by hcl, 1n; abrupt smooth boundary. Lab sample # KSUR0910; observed in push tube. discontinuous - phpvsfiid 313562; discontinuous - phpvsfiid 313562
    Btk—80 to 116 centimeters (31.5 to 45.7 inches);, brown (10YR 4/3) exterior, moist; silty clay loam; 3 percent sand; 36 percent clay; moderate fine prismatic structure; moderately hard, firm, moderately sticky, moderately plastic; very slow permeability; 0.5 very fine roots between peds; 1.0 fine irregular pores; 2 percent faint dark brown (10YR 3/3), moist, clay films on all faces of peds; 1 percent fine dark yellowish brown (10YR 4/6), moist, masses of oxidized iron and 10 percent fine black (N 2.5/0), moist, iron-manganese nodules; 1 percent fine distinct spherical carbonate nodules between peds and 1 percent fine faint carbonate masses on faces of peds; fragments; noneffervescent, by hcl, 1n; clear smooth boundary. Lab sample # KSUR0911; observed in push tube. The matrix did not effervesce, only the CaCO3 nodules were effervescent.; discontinuous - phpvsfiid 313563; discontinuous - phpvsfiid 313563
    2Bt1—116 to 175 centimeters (45.7 to 68.9 inches);, dark brown (7.5YR 3/3) exterior, moist; silty clay loam; 3 percent sand; 36 percent clay; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; very slow permeability; 0.5 very fine roots between peds; 1.0 fine irregular pores; 2 percent faint dark brown (10YR 3/3), moist, clay films on all faces of peds; 10 percent fine distinct black (N 2.5/0), moist, iron-manganese nodules and 10 percent fine distinct strong brown (7.5YR 4/6), moist, masses of oxidized iron; 2 percent fine faint gypsum masses; fragments; noneffervescent, by hcl, 1n; gradual smooth boundary. Lab sample # KSUR0912; observed in push tube. discontinuous - phpvsfiid 313565; discontinuous - phpvsfiid 313565
    2Bt2—175 to 207 centimeters (68.9 to 81.5 inches);, dark brown (7.5YR 3/4) exterior, moist; silty clay loam; 3 percent sand; 36 percent clay; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; very slow permeability; 0.1 very fine roots between peds; 5.0 fine irregular pores; 1 percent faint dark brown (10YR 3/3), moist, clay films on all faces of peds; 5 percent fine distinct strong brown (7.5YR 4/6), moist, masses of oxidized iron in matrix and 5 percent fine distinct black (N 2.5/0), moist, iron-manganese nodules in matrix; 2 percent fine faint gypsum masses; fragments; noneffervescent, by hcl, 1n; clear smooth boundary. Lab sample # KSUR0913; observed in push tube. patchy - phpvsfiid 313564; patchy - phpvsfiid 313564
    3Bt3—207 to 234 centimeters (81.5 to 92.1 inches);, reddish brown (5YR 4/4) exterior, moist; silty clay; 3 percent sand; 41 percent clay; moderate fine prismatic structure; slightly hard, friable, moderately sticky, moderately plastic; very slow permeability; 1.0 fine irregular pores; 1 percent faint dark brown (7.5YR 3/3), moist, clay films on all faces of peds; 2 percent fine faint yellowish red (5YR 4/6), moist, masses of oxidized iron and 5 percent fine distinct black (N 2.5/0), moist, iron-manganese nodules; 1 percent fine faint gypsum masses; fragments; noneffervescent, by hcl, 1n; clear smooth boundary. Lab sample # KSUR0914; observed in push tube. patchy - phpvsfiid 313578; patchy - phpvsfiid 313578
    3Bt4—234 to 246 centimeters (92.1 to 96.9 inches);, brown (7.5YR 4/4) exterior, moist; silty clay loam; 3 percent sand; 34 percent clay; moderate fine prismatic structure; slightly hard, friable, very sticky, very plastic; very slow permeability; 1.0 fine irregular pores; 2 percent faint dark brown (7.5YR 3/3), moist, clay films on all faces of peds; 1 percent fine distinct light olive brown (2.5Y 5/3), moist, clay depletions and 2 percent fine distinct iron-manganese nodules and 15 percent fine faint strong brown (7.5YR 4/6), moist, masses of oxidized iron; fragments; noneffervescent, by hcl, 1n; abrupt smooth boundary. Lab sample # KSUR0915; observed in push tube. patchy - phpvsfiid 313579; patchy - phpvsfiid 313579
    4Cr—246 to 255 centimeters (96.9 to 100.4 inches); fragments; strong effervescence, by hcl, 1n.; observed in push tube