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<br />' `' ''•:,;i;:CO-CPA-1 U,~ Dept. of Agriculture, r;~.. ~,
<br />^4/82 So11 Conservation Servlee ~~ ,
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<br />. '` "'> .~ CQtSERVATIQI PLAN ttAP AND
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<br />SOIL AND CAPABILITY HAP LEGFIID SHEET
<br />' Tltfferent kinds of soilr range sites, or woodland sites arc separated on
<br />ma,pp~'by solid black lines. Within each area is an identifvin~,:sym::nl or
<br />• ' 'ntitne: The folloxing symbols are shown on your map: ,
<br />Symbol or Site Name t~
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<br />. 42-Platorti loam. This Is a deep, well drained soil on
<br />alluvial fans and terraces at elevations of 7,600 to 7,900
<br />fast. It lormetl In mbted alluvium derived mainly from
<br />basalt. The average annual preclpltation Is about e
<br />Inches, the average annual air temperaiure is about at
<br />'degrees F, .ancl the frost-free period lasts about 95 days.
<br />Slopes are 0 tit 1 percent
<br />Included In mapping ere small areas of Graypoint grav-
<br />elly sandy leapt and Dertick cobbly sandy loam.
<br />Typically, tort surface layer Is pale brown loam about 7
<br />Inches thick: The Subsoil Is brown clay loam and gravelly
<br />clay loam abt2ut 11 Inches thick. The substratum is
<br />brown very grtvelly clay loam about 6 Inches thick over
<br />send and grayel that extends to a depth of s0 inches.
<br />Perriteablllty Is moderate. Available water capacity is
<br />moderate, RuttoN Is stow; and the erosion hazard is
<br />alight The soR blowing hazard Is moderate (fig. 8). Effec-
<br />We rooting depth Is 80 Inches or more.
<br />This soil 19 used as native range and for irrigated
<br />alfalfa, potatoes (fig. 9), end small grains. Applications of
<br />commercial fertilizers and manure are commonly
<br />'needed, and'plent residues should be returned to the
<br />soil. Generai(y, all crops except legumes respond to ni-
<br />trogen ferUliz. ,and all legumes respond to phosphate
<br />fertilizer.
<br />8ordar; fur[ow, ,and sprinkler lydgatlon methods are
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<br />Generalized Descrip ions ,,
<br />(Detailed descriptions are avatlat~l~'.
<br />your So11 Conservation iervice office,)
<br />Seeding Is not advisable because of the bw relr(lall
<br />and the moderate available water capacity; Deferled
<br />grazing, cross lancing, and stock water developments, .
<br />prevent range deterioration and promote the growth`of
<br />desirable plant species.
<br />This soil provides a habitat best suited t0' openland'
<br />and rangeland wildlife. On croptand,';habitat for ring-~;
<br />necked pheasant, mourning dove, end. many; nongairle,~~
<br />species can be developed by establishing area for nest-, .
<br />ing and escape cover. For pheasant,] the .l lusion.iof„.
<br />undisturbed nesting cover is vital to hat>itaf de~elopm~tt,Q.,,
<br />especially In areas of intensive agriculture. E?angel~rt"
<br />wildlife such as pronghorn antelope can be increasedd'°
<br />development of livestock watering facilities and~pr• eT~:
<br />livestock grazing. ~'s ;,~f`
<br />Urban development on this spil is Iltnited Dy the tax-~`,•
<br />h vw_nt the substratum, which is gravelly belclw a dapth~,_;
<br />of 26 inches and presents a Caving hazerc(.in excava g~;,~
<br />and the rapid infiltration rate, which mqy Cau9e,pollu or
<br />of ground water when sewage lagoons 'or bench= pe' `.
<br />sanitary landfills are used for waste disposal. Theca a.
<br />bility subclasses are Ills irrigated and:Vlls nonirrigated:::~
<br />suitable for this Boll. Spdnkler irngaUOn is swted to most ~ ~ ~ ' .
<br />;crops. The hn'row method Is weN suited to row crops,
<br />end the bordtar method Is suited to alfalla end small ,"
<br />grains. Land' leveling and proper lengths o1 run are '
<br />needed to prsrent seepage and salt buildup.
<br />The potential naWe vegetation on this soil is dominat- w,NCe SITE: MOUNTAIN OUTWASH
<br />ed by Indian ricegresa, western wheatgrass, and blue
<br />Brame. If the range deteNorates, the proportion of Indian
<br />ricegrass and western wheatgrass decreases and the
<br />amount of blur Brame, equlrreltall, threeawn, anakeweed,
<br />and rabbRbrWah In the potential plant community In-
<br />creases. Undesirable weeds and annual plants invade
<br />and become abundant II the range condition becomes
<br />poorer.
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