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/ / ~ <br />L ~, .1 1.lJ ~.',' i <br />86D-Colby loam, 6 to 15 percent slopes <br />This is a deep, Well drained soil located in the southeastern part of <br />Yuma County. Tt occurs in areas up to 1200 acres in size. The soil <br />is developed in calcareous loess located on upland plains. Precipitation <br />is about 17 inches. The slopes are gently rolling to rolling. <br />About 10 percent of this unit is }=eith and };uma soils located at the <br />base of slopes and narrow-ccncave li}:e areas. Colby loam 3 to 6 per- <br />cent also is included. The surface :•erture of Colby is Sine sandy <br />loam in places. <br />7r-pically, the surface layer is a pale bro:.•n lcam about 5 inches thick. <br />The subsurSacc layer is a pale bro:rn lcam about 3 inches thick. The <br />substratum is acalcareous Yale broom silt loam to a depth oT 50 inches <br />and acalcareeus yellowish brc:rn loam toacepth of 60 inches or more. <br />Permeability is moderate. ~.vailable water holding capacity is high. <br />surface runoSS is medium. iros~on hazard is moderate. <br />Most of this soil is used for range. Tne potential native veEetation <br />on this site is dominated by sidecats grama, little bluestem, •~est- <br />ern wheatgrzss, blue grama, and perennial (orbs. Continuously heavy <br />grazing will result in a decrease of little bluestem,sidecats gram, <br />c:cstern wheat, and prairie clover. Alue grama and buSfalo grass will <br />increase in z dense loco producing sod. Grazing ranagcrent is the most <br />effective practice Sor reducing runoSS and irr~prcving range condition. <br />Mechanical Practices are effective on the gentler slopes. <br />