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• ~HIBIT I/J Cont'd) 1 1 1 1 11'et allu~~ial Land \Cct alluvial lan(1 IVdrl is on the ncarlc leyrl bottom 1^nds of the ]argw' streams nest. to stream channels thou^hout the trountc. 1'hr areas range from ?(1 to ]LO sores m size. Tlris ]nod type is reef roost of the time and ;: (loaded b} shr;uu0oty mice to several times a }'car durin_^ periods of high water. Lu•ludcd in utappnrg sr,, small areas of Loans' alluvial land, modcrntrly Wet. a fete small sand an(1 ~~racel bars. and areas un(erlain by heat-}~ cla{~, commmrh' called oxbows. ~'I'hc materials ar(• extremch' variable in testurr, they rnnsist of stratified lacers of dark-colmrd silt. loam, sod clac. The layers arr eeneralh' less than f. inches ibirl; and are underlain be sand, fine sand. and some ~ravcl at depths of 1 to 3 feet. Thee are Wet at a depth of °_ feet most of the time and arc connnmt]}' Wet to the surface. throughout the grouting season. i\atural fertility i~ ruoderatc to :god. .\rvas of this ]and type have a cegetatiye coyer of tt:nrr-tolerant. plants. such as cattails and srd~es. and arr not suitable for cultivation. because. of the Lazard ,.f flnadinC from streams and a high Water table. L ndcr imhraved mana,emen[, the production of native ;rass i~'r ~•rnzing or ha}- is eood. Generall}- a fete cottou«-aod t n~rs :nul tcillows am~ present. Capabilitc unit ';-w-I. ir:ealcd: ~-et \feadotc range site; tree planting suit- :~!,ilit} croup I. CA PA DI LITI' OMIT Vn-1. IR ItIGATED This unit consists Dole of R'et alluvial lan(l. The soil material in this land t~pr. is shallo+v to deep. {ere poor'1}' ~Irainr(I. ucarlc Irtrl, :uul strntifial. (lld oxbotc.; under- lain b}• clay arc also in arras mapped as this land t}pe. Thr, erosion ha:.:u'd is Dole slight, but the flood hazard is sr.vcre. This land type is too wet far rultiyatiau. It is suited to permanent hay or pasture. Seeding is difficult, but broadcasting and drag_ing to cover [hr seed arc success- ~ ful in some plaCCS. ljl'OIOC~~r;l$s, whr;ll _'1';155. arrllaPd- grass, fescue, and clover mal:c a good mixture for l,as-, tore. Ilse should he rotated to allots rrcrmcth periods and limit r(1 to l:cep the plants in a hcnlthc condition. Al[.bott~~h erosion is not a hnzarrl,' iur•br•s of grot~t6 left after use generally improves the stand and 16c pradnc-~ tlOn. Suitable irrigation methods arc sprinl;lrrs and f~o~d- inc, but eenrrall~' this lnn(1 type does oat nre(1 irrica-i lion. 8ub,urface drainage is not g(•ncrall} feasible, buts drainage ran be iniprocrd in smog areas. 'I'bis loud is conunonlt irrigated by use of tail «:ISte nr "free'' water. Goorl manacemcnt of water and fertilizer is nec•cssar}' for highh l,roductiyc pasture. WET MEADOW RAYGE 517E The soils of this range site have Water in abundance and Within reach of plant roots most of the time. Inter- mingled With areas of the site arr. places that are perm- anently tvet and myered With cattails and other Water- tolerant plants. The soils vary in texture, are deep. and are nearly level. The meadow vegetation of this site includes a number of tall prairie grasses that tend to decrease tinder heat}' grazing. Chief among these are switchgrass, prairie cordgrass, blg bluestem. and indian¢rass. Szd~~es. rushes. and Whratgrass increase as the taller grosses decrease. The forage of this site is of high quality and is cut for hay in some plocrs. The total annual ~'iel(1 of air-(lrv herbage is as much ns 1.000 pounds per acre or more. -Because the site does not depend nn annual rainfall, the production on a site in excellent condition t-aries little. About b0 percent of the total annual }'iel(1 comes from plants that provide forage for cattle. TREE PLANING <UIT.AnILITY f.ROUP 1 Thi= croup rrmsists of soils that me gcnrrallc un- f;nnrable. or unsuitable for trees hocmru• of our m more limihttions. 1'brsc limitations arc salinih'. all:aliuih'. slope. r.xcrssicc tcenu•ss, parr m,rntion. cohhlcstnnrs, gravel. shallowness, ]my available moisture capacity. and unfavorable testurr snob ns dune sand or veer brace clac. Tries arc not conunonly desircrl or pl;uttcd ou soils of this group. Some small areas of soils in this ~•rouo me satisfactory for trees in places. Other soils can~bc improved by pro- yirling better rlrainagc. b}' using salt- or alkali-re(lucing practices. and b}' apph•ing similar measures. Onsite iuccstigation is needed on the soils of this grasp before trees arc planted. Assistance can be obtained by rouractinc the local office of the Sail Consrrcation Scryicc. 46