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1 1 Loamy alluvial land, mutlcra \vet Il~~l is m nnutc d1'Rllffi~C\\';1\'s HII'OIh~llDllt t6c rat It is predoiniu:ultl} in the broader drninasr\yays that have a bi«h \oater tabh: and that. forulcrly had poor drainacr. '1•hc arras arc broad in the lar;,.cr and niorc !•cnth' slnpiu~~ dl:ain- at~c\cays, espcciaac in t.hc South I'lattc Piccr lintlnm. .Vl arc subject to dmna~c. in \-arcin~• dc_rces, be ftontl- in~ from adjacent slolms and main stream chanuols. Incluric•d in propping arc small areas of \unn loam, Satanta loam. 1\'et alluvial laud, and Loamy nllurial ]and. gl.an'clh- substratum. 'fhr soils :no mnrlorntcly deep. rnn~~in:~ from °_0 to 3f inches in depth, over unconsolidated spud and _ravel. 'T6cc arc tlarh-colored loam to cla}' loam in texture and henrrall}- are suatified. Thee arc normallc nonral- careous, but they are moderateh• influenced Lc soluble salts in places. 'thin lenses of sand, silt. or flue gravel mac be m any of the lacers. The soils of this land type nhsorb \cater at a motlrrate to slo\v rate, and the available cater capacity is high. .\rtificial drainaee is ~cncrall}- ncrtled to ?I'O\\' CI'OpS. Satural fertility is high, but. under the intensive mm~- a~ement used on these soils, artificial supplements are needed. Most of this land tope is irriRatrtl. In these arras, crops such as sugar beets, corn, small ;p:ains, and ye~c- tables can be ~romn. _Ufalfa and irrigated pasture are \\-ell adapted. 1\'csterlt \\hrat~rass. salt~rass. bl«c ~rmna. mtd s\citch_*t•ass arc ~*ro\cn in some areas. Capability unit III\v-1, ini~ated; not placed in a rank site: tree plant- ing suitability group 5. CAPABILITY L'\IT III~_I• IRRIGATED This unit consists Daly of Loamy alhn ial land, mod- zrately met. This land type is deep, some\chat poorlc drained. and nearly level. This land is eas\• to cultivate and absorbs mater at a moderate rate. It -has mzdium to high available v:ater capacity and moderate to moderately Blom perme:tbilin-. The erosion hazard is slight tD moderate, and the haz:ud of Hoorlin, is moderate to severe. This land tope is suited to most of the crops gm\cn in the county-. ~ good croppim, s}-stem is 3 or I tears of alfalfa. 1 year each of corn. small Drain, suR_ar beets, anti grain, and then back to alfalfa. Irrigated pastures are especially well suited. Bromcgrass. orchard~ras=_, anti fescue mixed with alfalfa or clover make lop;-licerl, productive irrigated pasture. \IDSt irrigation methods are suitable after leyel'me. subsurface drainage, and flood protection have been ap- plied to the area.-Drilled crops can be irri~atetl be con- trolled HDDdin~~. b} border dikes or ditches. or b\ garxl pipes. PDn- crop. can be irrigated he ftn'roms Dr sprin- klers. Len?ths of in-i~ation runs can' \vith the hind Df crop and the decree of suhsur6trr rlrainacr. Craps re- spond tD application DF nitro~rn and phosphorus if this land tope is rareftlll}- m;uta~rd. \hwa~~cment Df ~•mp residue and application of harncard manure aid in maintaining good filth. TRF. F. PL.4\TI\G sU1TABI LITI- CROUP 5 This group consists Df loamc soils on bottom lands that yr subject to flooding. 'The mater table is at n depth \vithin the reach Df line roots. Trees. particularly cDttonmond and n'illom. ~~rom rapidly Dn these soils. but thec arc schiom planted. Most of the h'ces h:n-e ~ron-n from seed \yashetl Dr blo\yn along the stream channels. Russian-Olive in some areas has escaped from adjacent plantings and is bccaniug estab- lished on some soils in this group. Onlc species of treys that can tolerate a cmisidrrahlr amount of moisture are \cell suited. -+Llthoueh some care, such as cultivation and need controh is~rrquirrd for the first ? or 3 \cars- the tyres then develop \cithmt[ fnrthrr care and•_ro\c as do trees that arc Inigatrd. Growth and survival rates are extrcmclc variable. ~HIBIT I/J (Cont'd) Loamy- alluvial land, gracellp substratum It~l occurs as small areas in major th•aina~rn-acs. It is a principal source of grovel. 1; early all areas arc subject to floo<lin~ from streams, and the floods often arc d:una¢in_. The soils arc shallo\c and stratified. The strata arr. of moderatzh- coarse textured to moderateh' fine tex- tured material that is underlain be ricrr• sand anti rra\-el. In some places the soils are slightly inflururrd he soluble salts. The soils of this ]and tepe absorb \cater at a rapid to slo\c rate. The available mater c;tpacit}- is loin. but mane areas pace a high \cater table that is beneficial to plant r<romth. \Ittch of this laud tope is cultivated and irrigated. The principal crops are trttcl: crops adapted to the area, mainly celerc, melons. smert corn. tomatoes, lrttnrr. carrots. onions.:nul cabha~e. The best ~ro\cin_~ conditions can be maintained if the normal \cater tnhlr is con- trolled so that it renmins at a depth of 10 to 3p inches helom the surface daring the rro\cin~ season. Other ir- ri~ated crops include pasture mixhu•es that require some irri=ration but arc partly sustained be the mater table in the =ravel lacers. Some of this land tope is in native brass. mainlc \cestern \cheatgrass. saltgn~ss. blue grama. and s\yitch- ¢rass. Thr. mettcr areas produce scd_cs, rushes. and cat- t;tils. 'T'his \-egctation is largch- sustained b}- the natural \cater table and by flooding. Little irri ration is needed. Capability unit. f\"\\-I, irri~atcd: not plnccd in n rank si L•; tree plc ntin_ suitability eranp 5. CAPA BI LIT\' UNIT IV,.-1, IRR[CAT ED This unit consists only of Loamy alluvial ]and, gCat'- elly substratum. It is shallo\\, well drained tD somewhat poorl}- drained. anti nearly level. Small areas of gravel and sand outcrops are scattered throughout. This land type is ease to cultivate and absorbs mater at a moderate rate. It has loa available mater cap:tcih- and rapid to very rapid permeability. The erosion haz- ard is Dole slight, but the hazard of ftoodin, is \-en- se\ere. - This land type is snitable for limited or special crop- pinn. such as use for h uck crop;. Irri_atetl pashu'e also Is suited to this land t} pe. 1Vheatgrass, tall fescue. and adapted rlocers are snitable species. Furrnm and sprinkler irrigation are snitable meth- ods of \vater application. 4cry intensive m;utaq~•ment is required tD keep this land type pralm'tivc. Lal_z appli- cations of barnyard manure :yid frrtilizet• ;u•r needed when producing truck r.rnps. such as bcnl lettuce. table canrots, green Dninns. cabbage. eelerc. and other spited crDps. TREE PLA KTI\C SGITADI LITY GROUP 5 Thin ~ronp consists of loam}' soils tot bottom lands that arc subject to flooding. The n'atm' table is at a depth within the reach of tree roots. 'T'rees. particularly rottonmootl and \viIID\y. groin rapidh' Dn these soils. but thc~ arc seldom planted. Most of the trees have grn\yn from seed n'ashctl or blo\cn almtg the stream channels. Rnssiau-olive in some arms has escnped from adjacent plnntin_s and is bernming rstab- lishrd on some soils in this group. Oral}- species of trots that can tolerate a mnsitirrablc amount of uoisture arc \\-ell suited..~lthough some care. such as cultivation and \cecd control. is mgnirrd for the first ~ or 3 years, the treys then develop \\'ithout fnrthrr rare and~;!ro\c as dD bees that are ini~nted. Growth and_uryical rates arc extrcmch' variable 47