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SOILS INPQRMATION
<br />t1-r)1:•Allvan complex, ! to 4ti pereen/ alopea. These
<br />sU•ongly sloping k malerolely sleep soils are on gravelly
<br />aplomb in the northern part of the county. The avenge
<br />amuml prrx•i~itatimt ranges from 17 -o r9 irrehea
<br />11iz gravelly smniy kmnr, I6 In 2fr lrereenl sbpee, melees
<br />up dmul &1 percent of the mapping unit, mul Akvan
<br />snmiy hmm, 9 In 2fi percent eMp:s, nlund :N- rnreent. The
<br />Uix euib urn ou the el«rlmr rrcela and rkigea Thu Allvan
<br />soil b al mklalopu.
<br />Aland 'Lll pereenl of this anti b Chappell eamly loam, 9
<br />l0 6 lu!nn~nl abpee, k:cklcy sandy kmm, iR l0 7.L percent
<br />elo(res, and Wugen hmm, 6 in 9 percent alopea. 77re Chap-
<br />pell euib are «r rmrrow elongated drainageways amt [one,
<br />k;ekley soils era on ridgy create, mrd Ure Wages soils rre
<br />un hml slope pmilbne.
<br />The Ilix soil is a deep, somewhat excessivoly drained
<br />soil. it fanned in very gravelly alluvial deposits of•lhe
<br />Ogallala Ponnalion.
<br />Typically Ure surface layer b a dark greyish brown
<br />gravelly sandy Iaam alronl •1 inches thick. The subsoil fs ^
<br />dark gruyk+h brawn gravelly coaroe enndy loam alwnl 11
<br />inches lhhk. '17re eubatrulum b a reddish yellow mares
<br />sand mrd gravel to tt depth of fill brches nr more.
<br />1'enocabilily b rapid. Bifective rending depth b ell
<br />babes or more. Available wafer mpodly b law. Surface
<br />rtumff b rapid, uud Ibe eroabn hazard is high.
<br />1'Ire Allvmr adi b a deep, well drained soil. It formed br
<br />cakar«rna, loamy alluvial mul eolbn detmsile underlain by
<br />amnl and graver.
<br />Typically the surfsce layer Is a dark grayish brown
<br />sandy bam shout 6 Inehee thick. Tht suhtroU In a dark
<br />grayish brown heavyy sandy loam amt aendy clay loam
<br />atxrul 19 inches lhkk. The eabatrelum b light Irrownbh
<br />gray, ealcareova sandy clay bam shout IA inches lhkk
<br />over nght hrown coarse semi and gravel that exkmb to
<br />fA inches or more.
<br />Permeability b m«brafe. Bifective carting depth b fA
<br />inches or more. Availably. water capecky is m«krak.
<br />Surface runoff b medium, and the erosion haaanl b
<br />mmlerak.
<br />These snib are ua«I almost entirely fur grazing. They
<br />are not suit«I to empland bemuse of the low svailntde
<br />water eapacily of the Uix sail, the nkgre, and the eronlon
<br />haranl. Small laolafwl areas are uerxl for nonirrigated
<br />cropland, but are heat needed bark la grass.
<br />liangelend vegelalbn of the INx soil mnabk mainly of
<br />bhre grmm~, skb+rak grams, IilUe bluenkm, and nplge.
<br />RengP.Ialld vrgelalion of lien Allvan writ rnrarials mainly
<br />of blue grams, bnifabgrean, weskrn wheatgrasa, and
<br />a«lge. Troper grazing use and planrr«1 graying nyetems
<br />are the moat imimrknl management practices to maintain
<br />quantity amt quality of deairolrle vegetation. Comhha-
<br />lbna of alockwakr development, fencing and deferred
<br />grazing doting the grazing season help improve amt msla-
<br />lain range condition. Range eeedbrg will speed tke
<br />reregeklbn of areas depleted by heavy groaing, cultiva-
<br />tion nr dher dbinrhances. Conkur furrowing and pkting
<br />are prac4kee thel improve venter inflllr9tinn god 1'lIIUtQ
<br />runoff and are eaperiaily etfecltve nn rangeland areas in
<br />poor and fair mnddion of the Allvan soil.
<br />Wtmlbreska and environmenkl plantings are dttiknlt
<br />k enfabUsh on these soils. l,imiled available wakr cepacl-
<br />ly, depth k eanrl and gravel, and elope are Lhe prinr~jl
<br />rnncerns in eetabftahing tree amt shrub plantingi. Rpedd
<br />care rnnnleting of summer fallow a year In advance of
<br />pbndnge, planting on the enntorrc, eorrtMnerl tuhivatlon
<br />for seed mntrol, and nuppkmenkl wakr b needed k In-
<br />sure eskbnshment end survival of plantings Trees bent
<br />euked and havin66 good survival are Rocky Mnnntain
<br />riper, eaekrn rerhvdar, pnmlernaa pine and Siberhm e
<br />Shrubs bent ulapkd are ekunkbunh sumac sml IUae.
<br />Rangeland wildlife sash as antelope mlknkil amt
<br />eoyok are best adapted on these soils. T~re relief, natural
<br />eprirrgs and native vpgelatian provkle foal and rover.
<br />Areas of these sails provMe niter Lhat can be readUyy
<br />devebped and managed for wildlife. Proper Iiveeloek
<br />grazing management b necessary if liveeloek amt wildlife
<br />share the range. Watering farilitka are also ImpnrlenL
<br />amt are nllllzed by rarblle WUIliife ryreeles. The pmdUnn
<br />of thane soils in relatbrrehip to eroplalul maker it vahmble
<br />ae eeeape corer areas for openbnd wiMlife, espeefally
<br />pheasants.
<br />9bpe b the primary Ihniliug aril fcatnre where throe
<br />eniM are used /nr rnrmeaike or other urban developmenln.
<br />Inlem+ive enginrering desigrm amt meaenrea are needed
<br />b minlmke the ebpe Iimltelbns Where the soils are con-
<br />eklered for a new~gge bgoon syekm, special scaling
<br />melhoile are regnhed to avereome eaeeeelve seepnge.
<br />CapaMlky subclses Vle nonhtigated.
<br />itq-Sa1aMa bkpt, 1 to i pereeal ebtta. Thb b a
<br />'deep, tvetl drained soil on kmea sad upbnd pals. It
<br />formed b carcarmm, loamy eolian and alluvial materbls
<br />Ths areroge annual preeipiktbn ranges from IA to 19
<br />6tehea. 81opn aro gently soping.
<br />irrchnled in this unk are small areas of t'lalner loam,
<br />Wages loam and Numr bam.
<br />ypkally the aurfrce layer b grayish brown bam about
<br />1 brches thick. Tho subsoil b a dark groybh brown and
<br />gnybh brown slay bam about 19 Inches thick rod b cal-
<br />tareoua in the lower part. The substratum b Ilghl gray
<br />and very. peb brown, nkareoue bam exknding l0 6n
<br />btdrea or more.
<br />Permeabilky b moderate- Effective rooting depth b ee
<br />lashes or more. Avakrble water capacity b high. 8urtace
<br />runoff b ebw, and Lhe erosion lusard b slight.
<br />Thb aoU is wed mainly for hvigstad and mn4rlgated
<br />erophad. The romaining amrN acreage b used for graaing.
<br />In led cropland area mro, altalh, auger beets and
<br />sautU gratin aro the main crops grown. Wheel and
<br />um aro the maM eropa groan hi • crop-f~Now
<br />a bUmked.~aled eropbnd areas because preeipila-
<br />Nanagement concerns in irrigated areas arc proper use
<br />of hTigaUon wakr, maintenance of fertility sod control of
<br />aoU erosbn. Thb soil b well suked to furrow sent border
<br />irrigalbn. Land IsveUng b aeeessary in most ueu k ob-
<br />tain "uniform dbtribution of wakr. irrigatbn water
<br />m~mgement b needed for ef8cknt nee of wakr and con-
<br />trol of soli loos. lncnrponttng crop reekluea isle the aur-
<br />tacs eon bereasea InBkratbn, reduces soil lose mrd im-
<br />pprorea eoU tUlh, AppUcations of manure and commerelal
<br />fettUben eontataing nitrogen and µhosµlrorue are impor•
<br />t.nt b maintaMhrg eon produclirily.
<br />la nonlrrigeled cropbml areas the prhaary objective of
<br />management b conserving tmbtnre. Stubble mulch tillage
<br />and Incorporating crop reeklnes are eaeentlal conservation
<br />raelices k hnprove infikration. Chbeling or aubeoiling
<br />Pmprores water ppeenetratbn. Tillage should be kept to a
<br />migbnum. Terracing b also beneflebl in mmerving water
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