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20 sou, suRVEr
<br />Nunn Series
<br />The Nunn series is made up of deep, well-drained soils.
<br />These sails formed on terraces and valley side slopes in
<br />loamy allurium. Slopes are 0 to 9 percent. Elevations are
<br />4;900 to 5.500 feet.'Tlle native vegetation is mainly short
<br />and mid grasses. Annual precipitation is 12 to 18 inches.
<br />Mean annual air temperature is 48° to 5`?° F., and the
<br />frost-free season is about 140 to 155 days.
<br />In a representative profile the surface layer is grayish-
<br />brown clac loam about 10 inches thick. The subsoil, about
<br />20 inches thick, is brown and rer}• pale brown clay that
<br />grades to clay loam. It is noncalcareous in the upper part,
<br />but coniains soft lime segregations in the lower part. The
<br />stlbstratllm is stronglc calcareous, very pale brown clay
<br />loam estendin_ to a depth of 60 inches or more. In the
<br />surface layer. soil reaction is neutral. In the upper part
<br />of the subsoil. it is mildly alkaline. and in the lower part
<br />of the subsoil and in the substratum it is moderately
<br />alkaline.
<br />Ntlnn soils have slow and moderately slow permeabil-
<br />ity. Available water capacity for the profile is high. Roots
<br />can penetrate to a depth of 60 inches or more.
<br />The acreage of these soils is used mainly for irrigated
<br />and drelmid crops and for pasture.
<br />Representative profile of Nunn cla_c loam. 0 to 1 percent.
<br />slopes, located 1,.9"0 feet east and 1,000 feet north of
<br />center of sec. 'r, T. ? N., R. 69 SIf.
<br />App to 10 inches, grnrish-brown-(lOTR 5/^_) clap loam, very
<br />dark grayish brown (lOYR 3/^_) when moist; weak.
<br />medium, subnngular blocky strveture that parts to
<br />weak. fine. granular; hard, firm; neutral; clear,
<br />smooth boundary.
<br />B21t-10 to 1S inches, brown (lOFR 4/3) clap, dark brown
<br />(lOTR 3/3) when moist; moderate. medium, pris-
<br />matlc strveture that parts to strong, medium and
<br />fine, en;ttlar and subangulnr blocks: very hard, verc
<br />firm; thin, continuous clac films on ped faces: mildly
<br />alkaline: clear, wasp boundary.
<br />B.2tca-1R to 23 inches, bronn (lOYR 5/3) clay, brown
<br />(lOYR 4/3) when moist; moderate, medium. pris-
<br />matic strvMUre that parts to moderate, medium, sab-
<br />angulnr blocky; very hard, very firm; thin, nearly
<br />contlnuotts claJ films on ped faces; strongly calcare-
<br />our, with [ew, one and medium, prominent, white
<br />(lOYR 6/2) lime segregations; moderately alkaline;
<br />clear, wavy boundary.
<br />B3tp-?3 to 30 inches. verc pale brown (lOYR ./3) claT
<br />loam, brown (lOYR 5/3) when moist; weak, coarse.
<br />prlsmatlc strvcture that parts to moderate, medium,
<br />subangular blocky; hard, firm; few, patchy clap
<br />Alms on ped faces; s[ronglS erlc~reous. with few,
<br />5ne end medium. prominent, white (lOYR S/?) lime
<br />segregatlons; moderately allraline: grednal, wavy
<br />boundary.
<br />Cm,30 to 80 inches, very pale brown (SOYR ./4) clap
<br />loam, yellowish brown (lOFR 5/4) when moist;
<br />massive; slightl3' hard, friable; strongly calmreous;
<br />moderately alkaline.
<br />The A horizon ranges from 6 to 14 incises in thickness and
<br />from sandc clac loam in elaT loam in texture. The B2t hori-
<br />zon ranges from 4 to 15 inches in thickness and from hence
<br />dap loam to clay in texture. Depth to calcium carbonate ac-
<br />cumulation ranges from li to 30 inches. The C horizon ranges
<br />from heavy loam to clap loam in texture. Tppictllp the send
<br />and gravel substratum is below a depth of 00 inches, but in
<br />places It is between depths of 40 and 80 indtes. As a result
<br />of excessive irrigation in some areas, a water table is Present
<br />at a depth of between 3 and 5 feet
<br />Nunn sandy clay loam, 0 to 1 percent slopes INnAI.-
<br />This soil is throughout the eastern part of the Area. It
<br />occurs as irregulady shaped areas snore than 3i acres in
<br />size.
<br />The profile of this soil is much like the one described
<br />as representative for rile series, bur, the surface layer is
<br />about 10 inches of sandc clay loam. The subsoil .= about
<br />fi inches of clay underlain b}• abou~: 32 inches of calcar-
<br />eous clay loam.
<br />Included with this soil in mapping are small areas of
<br />Nttnn clay loam, 0 to 1 percent slopes: Ascalon sandy
<br />loam, 0 to 1 percent slopes; and Fiifn soils. These il:clud-
<br />ed soils make up about 10 percent of each mapped area.
<br />Runoff is slon• on this soil. Permeability is moder:~~ely
<br />slow. Although the erosion hazard is slight, this =_oll
<br />should be protected from soil blowing during period=_ of
<br />strong winds.
<br />Almost all of the acreage of this soil is used for irri-
<br />gated crops. A few areas are used :Eor irrigated pasture.
<br />(Capability unit I, irritated; tree =_uitability group 3)
<br />Nunn sandy clay loam, 1 to 3 percent slopes (NnBI.-
<br />This soil is in the eastern part of the Area. In most
<br />places it occurs as ilTee lady shaped areas more than 20
<br />acres in size.
<br />The profile of this soil is mach like the one described as
<br />representative for the series, but the surface layer is
<br />about 10 inches of sandc clay loam. The subsoil is about
<br />4 inches of clay underlain b}• aboll: 20 inches of calcar-
<br />eous clay loam.
<br />Included with this soil in mapping are some small areas
<br />of Iiim soils; Nunn clac loam, 1 to 3 percent slopes;
<br />Ascalon sandy loam. 1 to~3 percent slopes; and \ireld fine
<br />sandy loam, 1 to 3 percent slopes. These included soils
<br />make up about 15 percent of each mapped area.
<br />Runoff is medium on this soil. Pzrnleability is moder-
<br />ately slon-. The erosion hazard is moderate.
<br />Almost all of the acreage of this soil is used for irri-
<br />gated crops. but a few small areas :ire used for irrigated
<br />pastures. (Capability unit IIe-2, irrigated; tree suitabil-
<br />ity group 3)
<br />Nunn clay loam, 0 to 1 percent slopes INuAI.-This
<br />soil is in the eastern part of the Area. In most places it
<br />is in irregular areas more than `?0 awes in size. This soil
<br />has the profile described as represe~ltative for the serie=_.
<br />Included with this soil in mappi:.lg are small areas of
<br />Nunn sandy clay loam, 0 to 1 percent slopes; and Nunn
<br />clay loam, 1 t.o 3 percent slopes. Also included are a few
<br />small areas of Nunn clay loam, 0 to 1 percent slopes, that
<br />]Save a seasonal hieh water table. These included soils
<br />make up about. l5 percent of each mapped area.
<br />Runoff is slow on this soil. Permeabilfri_- is slow. The
<br />erosion hazard is slight.
<br />Almost all of the acreage of this soil is used for irri-
<br />gated crops, but a few small areas are used for irrigated
<br />pasture. (Capability unit Its-1, irri?ated; tree suitability
<br />group 3)
<br />Nunn clay loam, 1 to 3 percent slopes INuBI.-This
<br />soil is in the eastern part of the Area. In mast places
<br />it occurs as irree ilarly shaped areas more than 40 acres
<br />in size.
<br />Included with this soil in mapping are small areas
<br />of Iiim soils; Nunn sandc clay loam, 1 to 3 percent
<br />slopes; Nllnn clay loam, 0 to 1 perxnt slopes: and Val-
<br />mont clay loam, 1 to 3 percent (.lopes. Also included
<br />near drainagewa}5 are small wet areas and a few areas
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