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<br />SOIL SURVEY
<br />county. Slopes are less than 3 percent. Some areas are
<br />broad in the lar�rr and more gently sloping drainage.
<br />ways, such as the Badger, San Arroyo, and Mudd.-
<br />Creeks, and in places on the S.outh Platte River. All are
<br />subject, in varying degrees, to flooding from adjacent
<br />slopes and main stream channels. Triebicied in mapping
<br />are small areas of Satanta loam. Nnnn loam, and Sandy
<br />alluvial land and some very small arras of Wet alluvial
<br />land.
<br />The surface layer is commonly, dark- rolored loam
<br />or clay loam about 6 to 10 inches thick. It is normally
<br />noncafcareous. In places sandier materials have been
<br />deposited unevenly oil tlic surface by tkialwaters. The
<br />underlying material is stratified loam, silt loam, and
<br />clay loam and contains varying amounts of fine sand,
<br />sand, and fine gravel. It is 20 to more than 60 inches
<br />thick, is brown to dark brown, :tnd in places ha3 weak
<br />strurture. It. is normally calcareous. `attd or sand and
<br />gravel, vtratified with t)iin lenses of silt. and loam, are
<br />in some platv:s below a depth of 36 inch-,,.
<br />The soils of this land type absorb .water at a moderate
<br />rate, and their available water capacity is high. The}
<br />are normally well drained. Natural fertility is lllgh.
<br />The surface layer is easy to work, but the *hazard of
<br />water erosion is very severe in all cultivated areas be-
<br />cause gullies form easily if fields are not protected from
<br />flooding. Broad ar(-a-,, more than 2M feet wide, are
<br />suitable for dryland cultivation and are le% subject to
<br />gully erosion.
<br />Nfost of this land typeer is in native graaa or in pasture
<br />that has been improved by the use of check dams and
<br />water sppreading. dative grnv" include western wheat -
<br />grass, )lit(, grania, and switchrms . A few areas of suit-
<br />able size are ustNl to produce Hinter .wheat, barley, and
<br />forage sorghums Capability unit VIe -I, nonirrigated;
<br />Overflow rangy site; tree planting suitability group 5.
<br />Loamy alluvial land, gravelly substratum ;10 orun
<br />as small areas in major dminagewrays. It is a principal
<br />source of gravel. Yearly all area -,% are vnhiect to flooding
<br />from streams, and the floods often are damaging.
<br />The soils are shallow and stratified. The strata arc
<br />of moderately roame ti•xt ured to moderately fine tex-
<br />tured material that is underlain 1)v river sand and
<br />gravel. In some places the soils are slightly influenced
<br />by soluble salts.
<br />The soils of this land tvpe alAorb water at a rap id
<br />to slow rate. The available water capacity is low, brut
<br />many areas have It high Rater table that. is beneficial
<br />to plant growth.
<br />lfuch of this land type is cultivated and irrigated.
<br />The principal crops are track crops adapted to the
<br />area, mainly celery, melons, sweet corn, tomatoes, lettitec.
<br />carrots, minions, and cabbage. The best growing conditions
<br />ran be maintained if tite normal water table is con-
<br />trolled so that it remains at a depth of 10 to 2i1 inches
<br />Below the surface during the growing season. Other ir-
<br />rigated crops include pasture mixtures that require some
<br />irrigation but are partly sustained by the water table
<br />in the gravel layers.
<br />Some of this land type is in native grass, mainly
<br />western wheatgrafs, saitgrass, blue grama, and switch-
<br />MOMS. The wetter areas produce sedges, rtrthes, and cat-
<br />tails. This vegetation is largrly sustained by the natural
<br />water table and by flooding. Little irrigation is needed.
<br />Capability unit I%*w -1, irrigated; not placed in a range
<br />site; tree planting; suitability group 5.
<br />Loamy alluvial land, moderately wet ttwl is in mans'
<br />drainageways throughout the county. It is predominantly
<br />in the broader dra:nageways thai have a high water
<br />table and that formerly had poor drainage. The areas
<br />are broad in the larger and more gently sloping drain-
<br />ageways, especia1v in the South Plattc Hiver hottom.
<br />All are snhject. to damage, in varying degree--, by flood-
<br />ing from adjacent slopes and main sYmam channels.
<br />included in mappring are small areas of Nunn loam,
<br />Satanta loam, ll�et alluvial land, and i.oamy alluvial
<br />land. gravelly substratum.
<br />The soils are moderately lee ), ranging from 20 to 36
<br />inches in depth, over uneonsNdated sand and gravel.
<br />They are dark - colored loath to clan loath in texture
<br />and generally are stratified. They are normally noneal-
<br />eareous, but they tire moderately influenced by soluble
<br />salts in places. Thin lenses of sand, silt, or fine gravel
<br />may be in any of the layers
<br />The soils of-this land tylx- alsorh water at a moderate
<br />to slow rate, and the available water capacity is high.
<br />Artificial drainage is generally needed to grow crops.
<br />Natural fertility is high, but under the intensive man-
<br />agement used on these soils, artificial supplements are
<br />needed.
<br />Most of this land type is irrigated. In these areas,
<br />cro (is such as sugar Beets, corn, small grains. and vege-
<br />tahles can be grown. Alfalfa and irrigated pasturr are
<br />well adapted. Western wheatgraass. saitgrass, blue firma,
<br />and swwitehgrasr; are grown in some areas. Capability unit
<br />IIIw -1, irrigated. not placed in a range site; tree plant-
<br />ing suitability group 5.
<br />Nunn Series
<br />The Dunn series consists of well- drained, nearly level
<br />soils on terraces. These soils formed in loamy alluvial
<br />material.
<br />In a repre,"ritatire profile. the surface layer is grav-
<br />ish -brown loam about inches thick. It is noncalcareous.
<br />The subsoil is dark gravish- hrown and grayish -brown
<br />clay about 17 inches thiek. It is noncaleareous. The
<br />underlying material, below a depth of 23 inches, is
<br />light yellowish-brown and grayish -hrown loan: and silt
<br />loam. It is highly calcareous and stratified.
<br />Nunn srtil.,t ab;nrl) water at a moderate rate, and the
<br />available mater capacity is high. Permeability is slow
<br />in Nunn soils that have a clap' loam surface laver, and
<br />itr is moderately slow in those that have a login surface
<br />layer. The entire soil is suitable for plant roots.
<br />Representative profile of Nunn loam, I to 3 percent
<br />slopes, in an area of grasts, 1,.'01 feet east and 2,540 feet
<br />north of the southwest corner of section 36, T. 3 S., R.
<br />0 W..
<br />A1-• -0 to 0 ttcbeq, R'ravish -brown (10YR 512) loam, very dark
<br />grhyish brown (10YR 3121 wben moist and crushed;
<br />weak, fine, granular structure; friable; nonvatcarrou%;
<br />neutral: clear, sutooth boutulary.
<br />nl- al to 9 inches, dark crayleh -hrown (10TR 4!21 light clay
<br />lnarn, very dark craytcb brown (10YR 312) when
<br />moist: weak, casrcw, priwaRtie struetan' parting to
<br />wen «, medium. subantmlar blocky strurtnre: Flightly
<br />hard, friable: thln patchy clay films on all tarts of
<br />pod-%; noncaleareou%: neutral : dear. i mooth boundary.
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