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<br />16
<br />SOIL SURVEY
<br />films on vertical and horizontal faces of peds; non-
<br />calcareous; clear, smooth boundary.
<br />$22tb-16 to 29 inches, dark-gray (lOYR 4/1) clay loam, binek
<br />(lOYR 2/1) when moist; strong, medium and fine,
<br />prismatic structure that breaks to strong, fine, angular
<br />blocky; slightly hard when dry, firm when moist;
<br />thick, continuous clay films on vertical and horizontal
<br />faces of peds; noncalcareous; clear, smooth boundary.
<br />Bair-29 to 37 inches, light brownish-gray (lOYR 6/2) clay
<br />loam, dark grayish brow¢ (lOYR 4/2) when moist;
<br />moderate, medium, prismatic structure that breaks to
<br />moderate, medium, subangular blocky; slightly hard
<br />when dry, friable when moist; noncalcareous; thin,
<br />patchy clay films; many krotovinas filled with material
<br />from above, very dark grayish broom (lOYR 3/2)
<br />when moist; clear, smooth boundary.
<br />Ces-37 to 60 inches, pale-brown (SOYR 6/3) loam, dark brown
<br />(lOTR 4/3) when moist; weak, medium and thick,
<br />prismatic structure that breaka to weak, medium and
<br />coarse, subangular blocky; soft when dry, very friable
<br />when moist; very strongly calcareous; a layer of
<br />very fine sandy loam, dark brown (lOYR 4/3) rvhen
<br />moist, is at a depth oP 46 to 60 inches; many kroto-
<br />vinns;gradualboundary.
<br />In thickness, the A horizon ranges from 5 to SO inches and
<br />the B21t horizon ranges from 6 to 15 inches. Depth to the top
<br />of the buried mil ranges from I2 to 18 inches. In some areas
<br />gravelly material underlies these soils at a depth oP only 40
<br />inches.
<br />Iiuma soils have Less clay in their subsoil than Rago or
<br />Richfield soils. Iiuma soils are deeper to the limy substratum
<br />than are Richfield soils and have weaker structure throughout.
<br />Platner Series
<br />The Platner series consists of deep, well-drained, loamy
<br />soils that are nearly level to moderately sloping. These
<br />soils are extensive in the hardlands in the southwestern
<br />part of the county. A few areas are also along the banks of
<br />small intermittent drainagoways. These soils formed in a
<br />thin silty deposit of windblown material that has been
<br />mixed to some extent with the underlying sand and gravel.
<br />In a typical profile the plow layer is grayish-brown loam
<br />about 5 mehes thick. Fine gravel makes up about 5 percent
<br />of this layer. Clean sand grains are evident in the lower
<br />inch ofthislayer.
<br />The subsoil is about 12 inches thick. The upper part,
<br />about 7 inches thick, is dark grayish-brown clay that is
<br />very hard when dry and firm when moist. The lower part
<br />is dark gl.ayish-brown clay loam that is very hard when
<br />dry and friable when moist.
<br />The underlying material is very pale brown, very
<br />strongly calcareous loam that is morre sandy and limy as
<br />depth increases.
<br />These soils have high natural fertility and available
<br />water holding capacity. They are well suited to dryland
<br />cultivation under normal management, but soil blowing
<br />and water erosion are hazards in cultivated areas. Plow-
<br />pans form easily in these soils if they are tilled when wet.
<br />Almost all the acreage is dryfarmed, mainly to winter
<br />wheat, barley, oats, and sorghums. In a few undisturbed,
<br />generally small areas, the native vegetation is mainly
<br />grama grasses.
<br />Typical pmfile of Platner loam, 0 to 3 percent slopes, in
<br />a field of winter wheat (1,890 feet east and 200 feet north
<br />of the southwest corner of section 16, T. 7 N., R. 46 W.)
<br />App to 6 inches, grayish-brown (lOYR 5/2) loam, very dark
<br />grayish brown (lOYR S/2) when moist; moderate,
<br />fine, granular structure; anghtly hard when dry,
<br />friable when moist; bleached sand grains and specks
<br />oP light brownish gray (lOYR 6/2) are evident in ~
<br />layer 1 or 2 inches thick; 5 percent fine gravel; pE
<br />6.4; noncalcareous; abrupt, smooth boundary.
<br />B2t-5 to 12 inches, dark grayish-brown (lOYR 4/2) clay, ver;
<br />dark grayish brown (lOYR 3/?) when moist; Strong
<br />medium and fine, prismatic structure that breaks t~
<br />strong, medium, angular blocky; very hard when dry
<br />firm when moist; moderate, continuous clay films m
<br />vertical and horizontal ped faces; some bleached sane
<br />grains on tops oY prisms; pH 7.2; noncalcareous
<br />clear, smooth boundary.
<br />B3-12 to 17 inches, dark grayish-brown (lOYR 4/2) light cla;
<br />loam, dark grayish brown (lOYR 4/2) when moist
<br />weak to moderate, medium, prismatic structure tha
<br />breaks to weak to medium subangular blocky: ver;
<br />hard when dry, friable rvhen moist; thin, patchy cla;
<br />films on vertical and horizontal ped faces; streaks o
<br />very dark grayish brown (lOYR 3/2) when moist, an.
<br />brown (lOYR 4/3) when moist, on some vertica
<br />ped Yacea; pH 7.6; noncalcareous; clear, smootl
<br />boundary.
<br />Clca-17 to 24 inches, very pale brown (lOYR 8/3) loam, pal
<br />brown (lOYR 6/3) when moist; weak, coarse, pri:
<br />matic stnreture that breaks to weak, coarse, auk
<br />angular blocky; hard when dry, friable when moist
<br />strong accumulation of visible finely divided lime
<br />pH 9.0; very strongly Calcareous; clear, smoot
<br />boundary.
<br />IIC2ca-24 to 48 inches, light yellowish-brown (SOTR 6/4) fin
<br />sandy clap loam, yellowish brown (lOYR 5/4) whe
<br />moist; massive (structureless) ; hard when dry, ver
<br />friable when moist; 40 to 50 percent fine gravel
<br />moderate accumulation of lime in which visible lim
<br />occurs jn finely divided forms, as coatings on th
<br />pebbles, and se crommon, medium-sized soft concrt
<br />tions; lower 14 inches slightly more sandy and cot
<br />twins Wrote lime than upper part of horizon; pH 9.0
<br />very strongly calcareous; Clear, wavy boundary.
<br />IIC3--48 to 60 inchea, pinkish-white (7.5YR 8/2) very fin
<br />sandy clay loam, pink (7.5YR 7/4) when moist
<br />massive (structureless) ;very hard when dry, friabl
<br />when moist; strong accumulation of lime in marllik
<br />material; pH 3.0; very strongly calcareous.
<br />The A horizon has little range in color or texture. In mos
<br />areas it shows bleaching or clean sand grains on the strnctur
<br />faces in the lower inch, but the sand grains are normally mixe
<br />with the plow layer in cultivated areas. The A horizon range
<br />from 4 to 7 inches in thiclmess. The B horizon ranges from
<br />to 12 inches in thickness and from dark grayish brown t
<br />dark brown in color. It is heavy clay loam or c1aS• Depth t
<br />lime ranges from 10 to 20 inches.
<br />Platner soils developed in a thinner deposit of loess than th
<br />Rago soils, and they lack the dark, buried layer that occurs i
<br />the Rago soils. The subsoil of Platner soils is more clayey nn
<br />more strongly developed than that of Ascalon soils.
<br />Platner loam, 0 to 3 percent slopes IPoB) mainly oc
<br />cupies convex areas that are irregular in shape and ar
<br />elongated in asoutheast-northwest direction. This soil i
<br />also on side slopes along intermittent draina~eways. It
<br />profile is the one described as typical for the series.
<br />Included with this soil in mapping were small areas o
<br />nearly level Rago soils in slightly depressional areas, Als
<br />included were a few small spots of gravel or caliche out
<br />crops, which are shown on the soil map by a symbol,
<br />Nearly all of this soil is cultivated. Soil blowing and wa
<br />ter erosion are only slight in dryfarmed areas that ar
<br />managed well, but plowpans form easily if this soil i
<br />tilled when wet. Suitable dryfarming practices are use o
<br />stubble mulch and crop residue. Where irrigated, this soi
<br />can be leveled so that water spreads uniformly and is no
<br />wasted. In irrigated areas, crop residue should be worker
<br />into the soil so as to maintain tilth and reduce erosior
<br />Grass can be seeded and irrigated and then used for hay o
<br />pasture.
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