|
.:U . SO:T.. SURVEY
<br />c^v;r r:•nsion i, :I 9:: ::e rd, irri~;'atinn runs should he shot•t.
<br />an,i ir:'i.ui,,:I L,•.:..s s:n:Ill. dome shalieu'-roo,ed crops
<br />u;:,l i~ -.i,',nn as,~;t:n asonc: ;I a'rc.l:.
<br />1'i In,•i:'):'::1:;; .il,~:;l.l bc• established to hr.lp cont.rnl soil
<br />blotci;)_. i~i,•„!. sh.mla »nl. b,,, h:u',• aurin~ lharutbrt•
<br />ti:rouprh :~,•6r;:::rc. :uul crop rexiar„; should be IGft, n»
<br />t!„ .: ri::rr Ia onh•r to utiuintizo ..,i; lopes c;nlscd by
<br />suit bh,)cin ~.
<br />(i::,in ,•rn;>z rrn)rn nn chess .nil.; r.:<puna lu applira-
<br />tions of nilro~,•n tert.ili>:cr. Iiay anti pasture crops 1'r,-
<br />sr„nt,l to ::n)!;,•ation nl plmsphurus Ic:;.ilizac. Use Gf
<br />nl.u:nr,: procl,:;s ,Ir;;:rtic lu;u.l.'.r ;nut pL,»t nutrients,
<br />l:rlnc hoer; asr iul:a;r ni v:atcr, and impt•ncea filth so tiua
<br />t i.:-e >o i':i ,:a.i he w,;rl;cri m;,:c easily. _
<br />. ~.,.. r, L'!,i :1 :',) :IIIIr:l t0 .: rl;;atra ')L~`.;;I'v'. SIIOOth
<br />-nn:r •:::>: ;nl,i oroh:n'lirass :Ire auitai,lr. pa,Lurc. ~casscs.
<br />'!'Le a,i,ii:ioa of alfalfa or :\lsihe closer increases the
<br />cah:c Gl rite 1'ora_c. .Iu Grace to maintain production,
<br />I,a~:r,rzs si:GUld be rotated and grazing should be lim-
<br />ireu so ;filar a mininut:u of 4 inches of s'c;tbbic is left on
<br />the soil. 1t"ith fond management and use of fct•tilizer,
<br />_':a.~-lr,nmc mixtures eau be used indcfinitcly for pas-
<br />r:ra or i:ay.
<br />C.1PAC: L:-1' UNIT Ills-5 ([RRIG.iT2D)
<br />'!'ha one soil in i.his capability unit, 1}reld loamy sand,
<br />? rr..1 pc;ecnt. slopes, is deop and well drained. It has a
<br />ioanlc ;;::d sm;acc layer and a clay altd clay loam sltb-
<br />:oil. ?r.•nmabilicc is stout Runoff is slow, and the hazard
<br />Gf =oil blou-ir,~* is high. Available venter capacity is high,
<br />Th, crirGricc rGOtm;, depth is 60 inches or more.
<br />.'his soil is used for.irrigated craps. Corn, alfalfa and
<br />s:n~.li grain arc the main crops. r\ stit.ablc cropping sys-
<br />tem is aifeltt for ~ m• 4 }'ca7~, followed by curet and a
<br />s:nnil grain. IiGw c+rops should be grown only if (1} crop
<br />rrsiii rc is let`r rot t11cround dnrin~ the windy period in
<br />v: inrrq• and sprinrt. Gi (2) a winter cover crop Is estab-
<br />lis?Ied to nrG`rct. rho soil from blmving.
<br />~prir.kles arc the most effective method of irrigat-
<br />i:t, this soil. The sprinhlcrs should be self powered or
<br />ca:.ii}' rentnced bcc.ausc fregnatt irrigations arc required.
<br />('rops _rmcn rot this soil respond to fcrtilircr contain-
<br />ir.~ lli;)»_~n a::ri r;itns')horus. Use of crop residue and
<br />manrrc i:rl:~s ir.;i;rocc filth.
<br />:'his seil~is « ell suited to permanent grass for pastnre
<br />Gr h v. 8:uanth l;rn;uegl•ass and Grcha;zlgrass are suit-
<br />.^.i;lr. ~.a=ses.'_hr e,laition Gf alfalfa or :11sil:e clover in-
<br />s aasrs t'alce. of ?,,~ fat-:~c. On the morn. nearly level areas
<br />i,n:;?r•: en r. ltr m;•d roe irriga tin; they and pastnm. Irri-
<br />,crn :..::s .;i'cul:.l i)r short. Frrqucnt, light irrigations
<br />:,re :~.„ '. 'i'n :r.cintain in'GChut.imt, pastanrs should
<br />' ,~... ^1~:~.1: „r:~s.,r.~ lirnittxl sG t.hnt. a minimum of 4
<br />.• ..,; ;! >•r.!:i;L i; l ~fr. on the soil. 1Vith good ntanage-
<br />..~..t. al:~: I,~:• of !'ert.iliza•, pastlll'CS Gall be very produc-
<br />e
<br />• ~ ~,~~ C.)i•:,.^,::STI' U\IT IIIe-C (iRRiGATGD)
<br />':his uair. r•nnsisrs of dccp, well-drained soils of the
<br />.<„'a,l::. :,ia:n;;•, ;;nd Orcro series. These soils have a
<br />s., :.:'r k,:un ti,~rrnce lal'cr and n sandy loam or sandy
<br />care;;; spi:p:ni! nr unrieriying ]ayca•. Slrpcs arc 3 to 0
<br />t. :'cr:::;ci,iliry is moderate tG mode:aiely rapid.
<br />.....:n:: a i;un to rapid, and the crGSion ]t.;zard is
<br />•. '• • •-,r i,i~i,. arai]a.blc hater capacity is moderate
<br />. , i.i;;h, '.':,,, eGrr,l.icc rnGt•ing depth is 60 inches or more.
<br />'i'he soils Gf t.his capahilif.y unit ;Ire usul for ir.-i-
<br />gatecl crops.'1'hcir slGpc, howcccr, is ,,.r,ue augur:: ti:a.
<br />row or crgeta.hlc crops should be pl:nt:ari mtly=:i# alfalfa
<br />and sntnll gain lu•u used in the, rotation tG help :•cduco
<br />soil wnshiug anti soil irlowing. RGw crops sbnnld 1)c lim-
<br />ilcd to uo utorc Lhnn 2 ye:us in the rotation. Fcrpin~•
<br />Lilln~D to a miuiunuu helps reduce. soil oashiu;; aw[
<br />hlo,cin~.
<br />]~ IGUding from coutmn• ditches npd sprinkling arr. suit-
<br />able uu:.t.hrnls for irri~:d.ing drillc~l crops anti past::rc.
<br />iiow m•nps can br, irri~aletl Icy fln•rn:•:s, Gugtmn• hlri'ot::S,
<br />or spri;atlr.rs. Furro)v., shn:ilt] lr' ;: r,~•u,i rr,ro~s ;`.~; :,:ono
<br />to rrchrrc t.hr bnz;;rd of ~•ro:.ion. ;-i;;:~:,i:);; r:i;,l~.: ~smaa
<br />hard oC wal.cr rout shortcnin~ the, lcu~l.il of irrigation
<br />runs arc ways [n irnprovc control of erosion.
<br />These soi)s are well slitcrl to pcrmmtent grass for hay
<br />r,r pastnre. Smooth bromegrass, orchardgrass, or tall fcs-
<br />cuc arc suitable gasses. The addition Gf :\lsil:c closer
<br />or alfalfR increases vahre of the forme. To maintain pro-
<br />duction, frequent irrigations and applications of fertilizer
<br />containing nitrogen and phosphorus are necessary.
<br />CAPABILITY lJNIT IIlo-9. .(IRRICATRD)
<br />The one soil in this unit, Hargreave fine sandy loam,
<br />1 to 3 percent slopes, is moderately dccp and wdl drait:ctl.
<br />It has a surface lacer of fine sandy loam and a subsoil
<br />of fine sandy clay loam. Pcrmcability is moderate. Rtm-
<br />aft' is slow tG medium, and the erosion hazard is mod-
<br />erate. Available water capacity is ]ow to moderate. The
<br />effective rooting depth is between 20 and 40 inches.
<br />This soil is used for crops and pastnre. It is stited
<br />tG limited cropping.:\ suitable cropping s}'scan is alfalfa
<br />followed by small grain, l\>hcrc row crops are gown, they
<br />should br. limited to no more than 2 years in tie rotation,
<br />or rows sioulci be scanted across the slugs.
<br />117ost met.hotls Gf irrigation arc suitable, bat irrigation
<br />cons should be short enough to ;n•oid watcrloge ng the
<br />soil Frequent, light irrigations are necessary.
<br />Tltis soil is best suited to permanent pasture. Rrome,
<br />oroharcl, and fescue are suitable grasses. The addition of
<br />clover or alfalfa'improces the value of the forage. Rotat-
<br />ing grazing and limiting grazing are ways to maintain
<br />and nnprove the plant cover and help control erosion.
<br />Use of fertilizer improves yield.
<br />CAPABILITY UNIT lllw-1 IIRRiGATRD)
<br />This nni.t. consists of deep, somewhat poorly drained
<br />soils of the Loveland series. These soils have a clay' loam
<br />or sandy clay loam surface layer. The anderlying layer
<br />is a sandy clay loam, clay 1Gmn, or loam that is 20 to 40
<br />inches dccp Gcer gravelly sand. Slopes arc 0 tG 1 percent.
<br />Perrncabiiity is moderate. RunGfl• is slow, and the erosion
<br />hazard is slight, Available water capacity is moderato
<br />to high. The etective rooting depth is 60 inches or more.
<br />A seasonal high water table is at a depth of ° to 4 fe„f.
<br />'Ihese soils can be used for irrigated crops (fig. 9).
<br />Yields, however, arc lowered by the poor drainage. Salt-
<br />tolrrmtt crops, such as barley and sugar beets, arc espe-
<br />ciallywell suited.
<br />Irri~atimt systems should bc. designed to avoid ovet:r-
<br />rigation. The irrigation runs should be short. 'r rrq;tent.
<br />light. irrigatimts bole to minimize accunndat.ion of salts
<br />and to prercnt the excessive fluctuation in the w;tter
<br />table that can bo hnrmfitl to plants.
<br />
<br />l'
<br />
|