IDENTIFIERS

  • Current Taxon Name (Soil Name): Knull
  • OSD
  • Series Extent
  • User Site ID: S1957ID083001
  • User Pedon ID: S1957ID083001
  • Vegetation Plot ID: S1957ID083001
  • Lab Information:
  • Certified Lab Pedon Description - no
  • Lab Source ID - SSL
  • Lab Pedon # - 40A1085
  • NCSS Pedon Lab Data NASIS Record ID - 34144
  • Print Date: 11/23/2024

    • 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: 42.4541664
  • Std. Longitude: -114.4966660
  • Datum: WGS84
  • Township: 11S
  • Range: 17E
  • Section: 20
  • PLSS Details: west center of NW1/4, SW1/4
  • Location Description: Twin Falls SCD. Twin Falls County, Idaho. , 435 feet south of the middle of the canal; 35 feet south and 32 feet east of telephone pole no. 140, the second telephone pole south of the canal; about 8 miles south of the hospital at Twin Falls; About 4.8 miles east and 0.8 mile south of Berger. Sample was taken from a pit in a sagebrush-grass area, apparently never cultivated
  • State: Idaho
  • County: ID083—Twin Falls
  • Non-MLRA Soil Survey Area: ID704—Jerome County and Part of Twin Falls County, Idaho

    • PEDON

  • Describers Name: W. J. Leighty
  • Pedon Purpose: full pedon description
  • Pedon Record Orgin: Converted from PDP 3.x
  • Pedon #: 1
  • Sampled As Information:
  • Soil Name - Knull
  • Classificaton Date - 5/29/1957
  • Dynamic Soil Properties:
  • Erosion Class - 1
  • Pedoderm Loose Cover Indicator - no
  • Hydric: no


    • SITE

  • Runoff: low
  • Drainage Class: well
  • Surface Fragments:
  • Benchmark Soil?: no

    • VEGETATION

    SITE OBSERVATION

  • Observation Date: 5/29/1957 (actual site observation date)
  • Surface Cover Properties:
  • 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

    BRTE

    POSE

    Bromus tectorum

    Poa secunda

    cheatgrass

    Sandberg bluegrass

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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

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    1219

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    Ao—0 to 1 centimeters (0.0 to 0.4 inches);, very dark gray (10YR 3/1), dry; fragments; noneffervescent; neutral, pH 7.0, bromthymol blue; abrupt broken boundary. Lab sample # 40A08186. 0 to 1/2 inch thick. The Ao (and Aoo) is only under the larger big sagebrush; it does not extend into the barren and grassed spots between the sagebrush. There is some reddish-brown moss on the A1 under the sagebrush. Elsewhere, some greenish and yellowish-orange lichen or algae is on the A1. The surface has an uneven microrelief of 0.2 to 0.7 inch.
    A1—1 to 4 centimeters (0.4 to 1.6 inches); very dark grayish brown (10YR 3/2), grayish brown (10YR 5/2), dry; silt loam; very thick platy parts to weak very thin platy parts to weak very fine granular structure; slightly hard, friable, very sticky, slightly plastic; 21.0 roots; fragments; neutral, pH 6.7, bromthymol blue; abrupt wavy boundary. Lab sample # 40A08187; moist when described;. top 0.1 inch has a very fragile crust when dry.
    A2—4 to 11 centimeters (1.6 to 4.3 inches); dark grayish brown (10YR 4/2) and dark brown (10YR 3/3) crushed, light brownish gray (10YR 6/2) and grayish brown (10YR 5/2) crushed, dry; silt loam; platy parts to very thick platy parts to moderate very thin platy parts to weak very fine granular structure; slightly hard, friable, slightly sticky, slightly plastic; 21.0 roots; fragments; neutral, pH 6.7, bromthymol blue; abrupt wavy boundary. Lab sample # 40A08188; moist when described;. Sample is somewhat mixed with A1 because of the filled cracks. In one side of pit where B2 is less developed, this horizon is not so distinct nor so gray.
    AB—11 to 15 centimeters (4.3 to 5.9 inches); dark brown (10YR 3/3), grayish brown (10YR 5/2), dry; silt loam; moderate thin platy parts to moderate very fine and fine granular structure; slightly hard, friable, moderately sticky, moderately plastic; 21.0 roots; clay films on horizontal faces of peds; fragments; noneffervescent; neutral, pH 7.0, bromthymol blue; abrupt wavy boundary. Lab sample # 40A08189; moist when described;. patchy - phpvsfiid 189225; patchy - phpvsfiid 189225
    B2—15 to 25 centimeters (5.9 to 9.8 inches); dark brown (10YR 3/3), brown (10YR 5/3), dry; silt loam; moderate medium subangular blocky, and angular blocky parts to moderate very fine subangular blocky, and angular blocky, and weak medium platy structure; hard when dry, friable, moderately sticky, moderately plastic; 21.0 roots; 3.0 very fine pores; 30 percent brown (10YR 4/3), dry, clay films on vertical faces of peds and 30 percent dark brown (10YR 3/3), moist, clay films on vertical faces of peds; fragments; noneffervescent; neutral, pH 7.0, bromthymol blue; clear wavy boundary. Lab sample # 40A08190; moist when described;. continuous - phpvsfiid 189226; continuous - phpvsfiid 189227; continuous - phpvsfiid 189226; continuous - phpvsfiid 189227
    B3—25 to 34 centimeters (9.8 to 13.4 inches); dark brown (10YR 3/3), brown (10YR 5/3), dry; silt loam; weak fine subangular blocky structure; hard when dry, friable, slightly sticky, moderately plastic; 21.0 roots; 21.0 very fine pores; clay films in root channels and/or pores and brown (10YR 5/3), dry, clay films on all faces of peds and dark brown (10YR 3/3), moist, clay films on all faces of peds and clay films; fragments; noneffervescent; slightly alkaline, pH 7.4, cresol red; abrupt wavy boundary. Lab sample # 40A08191; moist when described;. discontinuous - phpvsfiid 189231; continuous - phpvsfiid 189228; patchy - phpvsfiid 189229; patchy - phpvsfiid 189230; discontinuous - phpvsfiid 189231; continuous - phpvsfiid 189228; patchy - phpvsfiid 189229; patchy - phpvsfiid 189230
    Cca1—34 to 44 centimeters (13.4 to 17.3 inches); dark grayish brown (10YR 4/2), light brownish gray (10YR 6/2), dry; silt loam; weak and moderate medium subangular blocky, and angular blocky structure; very hard, firm, slightly sticky, slightly plastic; 0.5 roots; fragments; slight effervescence; moderately alkaline, pH 8.2, cresol red; clear wavy boundary. Lab sample # 40A08192; dry when described;. At one place a tongue of this material extends to 22". 12-13 to 16-22".
    Cca2—44 to 64 centimeters (17.3 to 25.2 inches); dark grayish brown (10YR 4/2), light gray (10YR 7/2), dry; silt loam; weak medium and coarse angular blocky structure; very hard, very firm, slightly sticky, slightly plastic; 0.5 roots; fragments; strong effervescence; strongly alkaline, pH 9.0, thymol-blue; abrupt wavy boundary. Lab sample # 40A08193; dry when described;. a few nodules are coated with white lime; few roots confined to cracks. At about 18"" is a wavy brown root mat.
    Ccam—64 to 65 centimeters (25.2 to 25.6 inches); reddish brown (5YR 4/3), light reddish brown (5YR 6/3), dry; silt loam; massive; very hard, very firm; fragments; strong effervescence; very strongly alkaline, pH 9.2, thymol-blue; abrupt wavy boundary. Lab sample # 40A08194; moist when described;. contains moderate number of extremely firm, very dense nodules of soil material similar to those in above horizon; no roots.
    Cca33—65 to 98 centimeters (25.6 to 38.6 inches); grayish brown (10YR 5/2), light gray (10YR 7/2), dry; silt loam; weak medium subangular blocky structure; hard when dry, firm, slightly sticky, slightly plastic; fragments; strong effervescence; very strongly alkaline, pH 9.2, thymol-blue; gradual wavy boundary. Lab sample # 40A08195; dry when described;. contains few to moderate extremely firm, very dense nodules of soil material; upper 5 inches is more difficult to dig with a spade; no roots; very few 0.75 inch channels filled with similar soil material.
    C11—98 to 123 centimeters (38.6 to 48.4 inches); dark grayish brown (10YR 4/2), pale brown (10YR 6/3), dry; silt loam; massive, and weak coarse subangular blocky; hard when dry, firm, slightly sticky, slightly plastic; 0.1 roots; 3.0 very fine pores; fragments; slight effervescence; strongly alkaline, pH 9.0, thymol-blue; gradual wavy boundary. Lab sample # 40A08196; dry when described;. moderately difficult to dig with a spade; occasional channel filled with brown material.
    C12—123 to 143 centimeters (48.4 to 56.3 inches); dark grayish brown (10YR 4/2), light brownish gray (10YR 6/2), dry; silt loam; massive; hard when dry, firm, slightly sticky, slightly plastic; fragments; slight effervescence; strongly alkaline, pH 8.6, thymol-blue; clear wavy boundary. Lab sample # 40A08197; dry when described;. pores, channels, and roots as in C11 but slightly less firm, slightly less difficult to dig; contains very few dark basaltic sand grains; moderately calcareous but no lime segregations.
    Dcab—143 to 158 centimeters (56.3 to 62.2 inches); grayish brown (10YR 5/2), light gray (10YR 7/2), dry; silt loam; massive; hard when dry, firm, slightly sticky, slightly plastic; 3.0 fine roots; fragments; strong effervescence; strongly alkaline, pH 8.6, thymol-blue; clear wavy boundary. Lab sample # 40A08198; dry when described;. Probably a buried ca and more mixed material.
    D11—158 to 184 centimeters (62.2 to 72.4 inches); brown (10YR 5/3), light gray (10YR 7/2), dry; silt loam; massive; friable, slightly sticky, slightly plastic; fragments; slight effervescence. Lab sample # 40A08199; moist when described;
    D12—184 to 217 centimeters (72.4 to 85.4 inches); brown (10YR 5/3), light gray (10YR 7/2), dry; silt loam; massive; friable, very sticky, very plastic; fragments; slight effervescence; strongly alkaline, pH 8.5, thymol-blue. Lab sample # 40A08200; moist when described;
    Mca—217 to 225 centimeters (85.4 to 88.6 inches); light olive brown (2.5Y 5/4), pink (5YR 7/3), dry; weakly coherent; fragments; strong effervescence; strongly alkaline, pH 8.6, thymol-blue. Lab sample # 40A08201; dry when described;. This lies on a light brownish-gray to pale brown, moderately to strongly calcareous, weakly cemented hardpan which is brown when moist.