IDENTIFIERS

  • Current Taxon Name (Soil Name): Knippa
  • OSD
  • Series Extent
  • User Site ID: S1963TX463002
  • User Pedon ID: S1963TX463002
  • Lab Information:
  • Certified Lab Pedon Description - yes
  • Lab Source ID - SSL
  • Lab Pedon # - 40A4532
  • NCSS Pedon Lab Data NASIS Record ID - 40684
  • Print Date: 11/27/2024

    • 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: 29.3155556
  • Std. Longitude: -99.5772222
  • Datum: WGS84
  • Location Description: 3.9 miles E of Knippa, TX, along US Highway 90; 0.1 mile N of US Highway 90 across railroad tracks.
  • State: Texas
  • County: TX463—Uvalde
  • MLRA: 83A—Northern Rio Grande Plain
  • Non-MLRA Soil Survey Area: TX463—Uvalde County, Texas
  • 7.5 Minute USGS Quad: 29099-C5—Blanco Lake, Texas

    • PEDON

  • Describers Name: M. Stout
  • Current Taxonomic Class: Fine, mixed, superactive, thermic Vertic Calciustolls
  • Current Taxon Kind: series
  • Pedon Type: classifies to current taxon name, full description
  • Pedon Purpose: laboratory sampling site
  • Pedon Record Orgin: Converted from PDP 3.x
  • Pedon #: 2
  • Correlated Information:
  • Soil Name - Knippa
  • PSC - 25 to 100 cm.
  • Classificaton Date - 12/4/2015
  • Soil Taxonomic Edition - twelfth edition
  • Moisture Class - ustic
  • Moisture Subclass - typic
  • Sampled As Information:
  • Soil Name - Knippa
  • Classificaton Date - 4/23/1963
  • Dynamic Soil Properties:
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no
  • Certification Status: certified
  • QC Status: level 1
  • QA Status: level 1


    • SITE

  • Parent Material: alluvium derived from limestone
  • Landscape: inland dissected coastal plain
  • Landform: terrace
  • Anthropogenic Feature: leveled land
  • Geomorphic Component Terraces: tread
  • Slope Shape Across: linear
  • Slope Shape Down: linear
  • Runoff: low
  • Drainage Class: well
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 4/23/1963 (actual site observation date)
  • Surface Cover Properties:
  • Site Obs. Cover Kind 1 - grass/herbaceous cover
  • Site Obs. Cover Kind 2 - pastureland, tame
  • 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

    cambic horizon

    calcic horizon

    0—61

    61—86

    86—198

    —61—

    —25—

    —112—
    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

    0.5

    —

    —

    297.4

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —

    —
    Ap—0 to 15 centimeters (0.0 to 5.9 inches); dark grayish brown (10YR 4/2), very dark grayish brown (10YR 3/2), moist; clay; weak subangular blocky structure; hard, very firm; 21 percent worm casts and 2 percent fine carbonate concretions; fragments; moderately alkaline, pH 8.2, hellige-truog; abrupt smooth boundary. Lab sample # 40A34617; observed in pit, small. Upper 5 cm (2 in) is a loose mulch of very fine discrete flattened granules covered by a thin easily broken crust.
    A1—15 to 30 centimeters (5.9 to 11.8 inches); brown (7.5YR 4/2) and brown (7.5YR 4/3) crushed, dark brown (7.5YR 3/2), moist; clay; moderate and strong very fine subangular blocky, and moderate and strong very fine angular blocky structure; extremely hard, very firm; 3 percent worm casts and 1 percent very fine carbonate concretions; 1 percent by volume shell fragments fragments; moderately alkaline, pH 8.2, hellige-truog; clear wavy boundary. Lab sample # 40A34618; observed in pit, small
    Bw1—30 to 61 centimeters (11.8 to 24.0 inches); reddish brown (5YR 4/3), dark reddish brown (5YR 3/3), moist; clay; strong medium and coarse angular blocky parts to strong very fine angular blocky structure; extremely hard, very firm; 1 percent worm casts and 4 percent fine carbonate concretions; 1 percent by volume 2-39-75 millimeter quartzite fragments; moderately alkaline, pH 8.2, hellige-truog; gradual wavy boundary. Lab sample # 40A34619; observed in pit, small
    Bw2—61 to 86 centimeters (24.0 to 33.9 inches); reddish brown (5YR 4/4), dark reddish brown (5YR 3/4), moist; clay; weak prismatic parts to strong very fine angular blocky structure; extremely hard, very firm; 4 percent carbonate concretions and 1 percent worm casts; 1 percent by volume 2-?-5 millimeter quartzite fragments; moderately alkaline, pH 8.2, hellige-truog; clear wavy boundary. Lab sample # 40A34620; observed in pit, small. Suggestions of slickensides but could not confirm.
    Bk1—86 to 94 centimeters (33.9 to 37.0 inches); brown (7.5YR 4/4), dark reddish brown (5YR 3/4), moist; silty clay; weak prismatic parts to moderate medium angular blocky structure; extremely hard, very firm; 10 percent carbonate concretions; fragments; moderately alkaline, pH 8.2, hellige-truog; clear wavy boundary. Lab sample # 40A34621; observed in pit, small
    Bk2—94 to 114 centimeters (37.0 to 44.9 inches); brown (7.5YR 5/4), strong brown (7.5YR 5/6), moist; silty clay loam; moderate and strong fine and medium angular blocky, and moderate and strong fine and medium subangular blocky structure; very hard, very firm; 20 percent carbonate concretions and 3 percent worm casts and 10 percent carbonate masses; fragments; moderately alkaline, pH 8.2, hellige-truog; gradual wavy boundary. Lab sample # 40A34622; observed in pit, small. Wormcasts are nearly black and reddish colors.
    Bk3—114 to 145 centimeters (44.9 to 57.1 inches); reddish brown (5YR 5/4), yellowish red (5YR 5/6), moist; silty clay loam; moderate and strong fine and medium angular blocky, and moderate and strong fine and medium subangular blocky structure; very hard, very firm; 10 percent carbonate concretions and 3 percent worm casts and 5 percent carbonate masses; fragments; moderately alkaline, pH 8.2, hellige-truog. Lab sample # 40A34623; observed in pit, small. Wormcasts are nearly black and reddish colors.
    Bk4—145 to 198 centimeters (57.1 to 78.0 inches); reddish brown (5YR 5/4), reddish brown (5YR 4/4), moist; silty clay loam; weak prismatic, and weak angular blocky structure; 7 percent carbonate concretions and 1 percent worm casts and 3 percent carbonate masses; fragments; clear wavy boundary. Lab sample # 40A34624; observed in pit, small
    C1—198 to 244 centimeters (78.0 to 96.1 inches); light brown (7.5YR 6/4), brown (7.5YR 5/4), moist; clay loam; fragments. Lab sample # 40A34625; observed in auger, bucket. Auger sampled
    C2—244 to 305 centimeters (96.1 to 120.1 inches); clay loam; fragments. Lab sample # 40A34626; observed in auger, bucket
    C3—305 to 353 centimeters (120.1 to 139.0 inches); clay loam; 21 percent carbonate concretions; fragments. Lab sample # 40A34627; observed in auger, bucket