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;! <br />Costilln Co. <br />RSF 12/`j7 <br />H6~-- Platoro loam, 1 to 9 percent elopes <br />This ie a deep, yell drained soil on alluvial fans and terracee at <br />elevations of 7,600 to 8,000 feet. It is fo~v,ed in mixed alluvial <br />materials derived mainly from ip~reoue rocks. The average annual <br />precipitation is about S inches, averag= annual air Lemperature is <br />about L,1oF., and the frost-free period is about 95 days. Slopce are <br />1 to j percent. <br />Included in this unit are small a-eas of Gr;rvpoint, L~ihon, Monte, <br />Rock River and Stunner soils, all having slopes of 1 to 3 percent. <br />Typically, the surface layer is brown loam about !• inches thick. The <br />sub:+oil is yellowish brown or pale t.rown cl;.y loan about 1(~ inches <br />thick. T1re subslraliun io yellowish grown ,.;rnvci]y lo;~m viLh visible <br />calcium carbonate in Lhe upper b inches zu,~ overlies very f^_•avelly <br />sand that extends to GO inches or more. <br />Permeability is moderate. Effective rooting- depth is 20 to 40 inches. <br />Available eater capacity is moderate. Surface runoff is slow and wind <br />erosion hazard is moderate. <br />This soil ie used for native rr~~ge, for iri•ig~ated cropland, and irri- <br />gated pasture, Crops commonly grown are alfalfa, small grains and <br />potatoes. Applications of commercial fertilizer are commonly needed <br />. ~~. <br />~ J <br /> <br />F! <br />~; •, <br />~'S <br />." f <br />Vii. '. <br />`' - ~~ <br />