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. / <br />/ 102-Colby lca_T,, ~;llied, 15 to 2$ percent slopes <br />~ This is a deep, :ell drained soil located in tl;e southeastern part of <br />Yuma county. It occurs in areas up to 1,00 acres in size. Thin soil <br />is developed in calcareous loo;ss located cn upland plains.. Prcci.pitatica <br />is about 17 inches. The slopr.s are ,~cri~rately steep. 1'.any U-shaped <br />gul.lied arc'-s ire included in this sei7.. :'ca-;nall}~ each :.reap of this <br />unit is drained by a ticll ~rz~sed nearly 1LCel b~tt.cr.ed channel up to <br />200 feet amide, ::hich includes }?averscn soil. <br />About 10 percent of this unit is Yeith and l;uma soils loc~tcd at the <br />bzse of slopes a_nd in nan•cr-concave like areas.. The surface texture <br />cf Colby is fine sandy loam in places. <br />Typically, t'::e :,nrfzce ]a_~cr is z pale tro',;n loam abwt s inches thick. <br />the subsurface la_ er is a pale hrc:;n loam about 3 incl~,es thick. T!-:e <br />sc'estrztum is a.calcarcens pale bro~~ silt learn to a death of 50 inches <br />and a calcareous }-ellouish brcrr. loam to ad,pth of 60 incl;es or more. <br />Ycr,ncabillty is -:ode r te. ...ailable ::at.er ?;olding capacity is ;,i~h. <br />Surface n:neff is medi.urz. Er:sien hazard is ,.oderate. <br />'.'his soil is all used as range. <br />The noter.iial native vegetation on this soil is ricninated by sidecats <br />gr~:,a, little blue=_tem, ~:estern •.rheat grass, sandreed grass and blue <br />' , <br />gramz. i,'hen the range has been continuously .o:ergrazcd, the percentage <br />of ~:estern cheat grass, little blucstere, and sa.^.dreed grass tends to <br />decrease and the percentage of tlue gramz, buffalo crass, sedges and <br />nztive fobs includi^.g yucca, spa}:e'.:ecd, :r.d cactus tend to increz~e. <br /> <br />