IDENTIFIERS

  • Current Taxon Name (Soil Name): Knoblaw
  • OSD
  • Series Extent
  • Local Phase: clay, occasionally ponded
  • User Site ID: S1999TX195001
  • User Pedon ID: S1999TX195001
  • Vegetation Plot ID: 077A-S99TX195001 Knoblaw
  • Lab Information:
  • Certified Lab Pedon Description - yes
  • Lab Source ID - KSSL
  • Lab Pedon # - 00P0699
  • NCSS Pedon Lab Data NASIS Record ID - 12201
  • User Project ID: 2020WOD-EVAL-005
  • Project Name: MLRA 77A - Knoblaw silty clay, 0 to 1 percent slopes, occasionally ponded
  • Print Date: 1/8/2025

    • 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: 36.1219368
  • Std. Longitude: -101.3101883
  • Datum: WGS84
  • Country: US—United States
  • State: Texas
  • County: TX195—Hansford
  • MLRA: 77A—Southern High Plains, Northern Part
  • Non-MLRA Soil Survey Area: TX195—Hansford County, Texas
  • 7.5 Minute USGS Quad: 36101-A3—Morse SE, Texas

    • PEDON

  • Describers Name: Bauchert, James A.
  • Current Taxonomic Class: Fine, mixed, superactive, mesic Calcic Haplusterts
  • Current Taxon Kind: series
  • Pedon Type: OSD pedon
  • Pedon Purpose: laboratory sampling site
  • Pedon Record Orgin: NASIS
  • Pedon #: 1
  • Correlated Information:
  • Soil Name - Knoblaw (flagged as OSD)
  • PSC - 25 to 100 cm.
  • Classificaton Date - 2/2/2017
  • Classifier - Steven McGowen
  • Soil Taxonomic Edition - twelfth edition
  • Moisture Class - ustic
  • Moisture Subclass - udic
  • Sampled As Information:
  • Soil Name - Knoblaw clay
  • Classificaton Date - 11/29/1999
  • Dynamic Soil Properties:
  • Erosion Class - 0
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no
  • Certification Status: certified
  • QC Status: level 1
  • QA Status: level 1


    • SITE

  • Parent Material: clayey lacustrine deposits over loamy eolian deposits
  • Landscape: tableland
  • Landform: playa
  • Geomorphic Component Flats: dip
  • Slope Complexity: complex
  • Slope Shape Across: concave
  • Slope Shape Down: concave
  • Runoff: negligible
  • Drainage Class: somewhat poorly
  • Flooding: none flooding
  • Ponding: occasional ponding for brief periods
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

  • Ecological Sites. (Click Ecological Site ID For Link to EDIT.)
    Ecological Site ID Ecological Site Name Correlation Data Classifier
    R077AY005TX Playa 16-22" PZ

    • SITE OBSERVATION

  • Observation Date: 11/29/1999 (actual site observation date)
  • Air Photo ID: 3327-49
  • Plant Association Name: Playa
  • 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
    • Vegetation Plot Plants
    Plant Symbol Scientific Name National Vernacular Name Plant Type Group Canopy Cover % Vegetation Stata Level

    JUNCU

    KOSC

    POLYG4

    RUCR

    XANTH2

    Juncus

    Kochia scoparia

    Polygonum

    Rumex crispus

    Xanthium

    rush

    Mexican-fireweed

    knotweed

    curly dock

    cocklebur

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

    mollic epipedon

    redox concentrations

    slickensides

    secondary carbonates

    lithologic discontinuity

    calcic horizon

    0—61

    0—30

    13—81

    81—203

    81—203

    114—203

    —61—

    —30—

    —68—

    —122—

    —122—

    —89—
    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

    0.3

    —

    —

    989

    —

    483

    —

    190

    13.1

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    —

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    A—0 to 13 centimeters (0.0 to 5.1 inches); 70 percent dark gray (10YR 4/1) and 30 percent brown (7.5YR 5/4), 70 percent very dark gray (10YR 3/1) broken face and 30 percent brown (7.5YR 4/4) crushed, moist; clay; 9 percent sand; 39 percent silt; 52 percent clay; moderate coarse angular blocky parts to moderate medium angular blocky parts to weak fine granular structure; very hard, very firm, very sticky, very plastic; very high excavation difficulty; 2.0 very fine roots throughout and 1.0 medium roots throughout and 2.0 fine roots throughout and 0.5 coarse roots throughout; 5.0 fine moderate-continuity tubular pores; 2 irreversible trans-horizon cracks per meter with a width of 5 cm that extend above and below the horizon; 1 percent fine distinct irregular weakly coherent cemented strong brown (7.5YR 5/6), moist, iron-manganese concretions with clear boundaries in matrix; 2 percent fine shell fragments in matrix; fragments; noneffervescent, by hcl, unspecified; clear wavy boundary. Lab sample # 00P04381; dry when described; observed in pit, small
    Bss1—13 to 30 centimeters (5.1 to 11.8 inches); dark grayish brown (10YR 4/2), very dark grayish brown (10YR 3/2) broken face, moist; silty clay; 11 percent sand; 42 percent silt; 47 percent clay; moderate coarse prismatic parts to moderate medium wedge parts to strong medium angular blocky structure; very hard, very firm, very sticky, very plastic; very high excavation difficulty; 2 irreversible trans-horizon cracks per meter with a width of 5 cm that extend above and below the horizon; 10 percent distinct slickensides (pedogenic); 1 percent fine distinct spherical strongly coherent cemented iron-manganese concretions with sharp boundaries in matrix; 2 percent fine shell fragments in matrix; fragments; noneffervescent, by hcl, unspecified; gradual wavy boundary. Lab sample # 00P04382; dry when described; observed in pit, small
    Bss2—30 to 61 centimeters (11.8 to 24.0 inches); variegated 70 percent dark grayish brown (10YR 4/2) and 30 percent brown (7.5YR 5/4), 70 percent very dark grayish brown (10YR 3/2) broken face and 30 percent brown (7.5YR 4/4), moist; silty clay; 11 percent sand; 44 percent silt; 44 percent clay; moderate coarse prismatic parts to moderate medium wedge parts to moderate medium angular blocky structure; very hard, very firm, very sticky, very plastic; very high excavation difficulty; 2 irreversible trans-horizon cracks per meter with a width of 2.5 cm that extend above and below the horizon; 10 percent distinct slickensides (pedogenic); fragments; noneffervescent, by hcl, unspecified; gradual wavy boundary. Lab sample # 00P04383; dry when described; observed in pit, small
    Bss3—61 to 81 centimeters (24.0 to 31.9 inches); variegated 90 percent brown (7.5YR 5/4) and 10 percent dark grayish brown (10YR 4/2), 90 percent brown (7.5YR 4/4) broken face and 10 percent very dark grayish brown (10YR 3/2) crushed, moist; silty clay loam; 15 percent sand; 45 percent silt; 40 percent clay; moderate medium wedge parts to moderate medium angular blocky structure; very hard, very firm, very sticky, very plastic; very high excavation difficulty; 2 irreversible trans-horizon cracks per meter with a width of 2.5 cm that extend below the horizon; 10 percent distinct slickensides (pedogenic); fragments; noneffervescent, by hcl, unspecified; gradual wavy boundary. Lab sample # 00P04384; dry when described; observed in pit, small
    2Btk—81 to 114 centimeters (31.9 to 44.9 inches); strong brown (7.5YR 5/6), strong brown (7.5YR 4/6) broken face, moist; clay loam; 26 percent sand; 38 percent silt; 36 percent clay; moderate medium subangular blocky structure; hard, firm, moderately sticky, moderately plastic; high excavation difficulty; 5 percent distinct carbonate coats on all faces of peds and 10 percent distinct clay films on all faces of peds; 3 percent fine distinct spherical noncoherent cemented carbonate masses with clear boundaries in matrix and 2 percent fine distinct threadlike noncoherent cemented carbonate masses with sharp boundaries infused into matrix along faces of peds; fragments; strong effervescence, by hcl, unspecified; abrupt smooth boundary. Lab sample # 00P04385; dry when described; observed in pit, small
    2Bk1—114 to 175 centimeters (44.9 to 68.9 inches); reddish yellow (7.5YR 7/6), reddish yellow (7.5YR 6/6) broken face, moist; silty clay loam; 18 percent sand; 44 percent silt; 39 percent clay; 26 percent carbonate clay; weak medium subangular blocky structure; moderately hard, friable, moderately sticky, moderately plastic; moderate excavation difficulty; 10 percent fine distinct spherical weakly coherent cemented carbonate nodules with clear boundaries in matrix and 20 percent fine distinct spherical noncoherent cemented carbonate masses with clear boundaries in matrix; fragments; violent effervescence, by hcl, unspecified; gradual wavy boundary. Lab sample # 00P04386; dry when described; observed in pit, small
    2Bk2—175 to 203 centimeters (68.9 to 79.9 inches); pink (7.5YR 7/4), light brown (7.5YR 6/4) broken face, moist; silty clay loam; 17 percent sand; 45 percent silt; 38 percent clay; 20 percent carbonate clay; weak medium subangular blocky structure; moderately hard, friable, moderately sticky, moderately plastic; moderate excavation difficulty; 8 percent fine distinct spherical noncoherent cemented carbonate masses with clear boundaries in matrix and 7 percent fine distinct spherical weakly coherent cemented carbonate nodules with clear boundaries in matrix; fragments; violent effervescence, by hcl, unspecified. Lab sample # 00P04387; dry when described; observed in pit, small