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20 inches, the average annual air temperature is about 40 degrees <br />• F., and the average frost-free period is less than 75 days. <br /> <br />Typically, the surface layer of Silas soil is very dark grayish <br />brown to very dark gray, 14 inches thick. The underlying material <br />is a very dark gray and very dark grayish brown loam to a depth of <br />60 inches. Coarse fragments range from 5 to 20 percent throughout <br />the profile and are fine channery in size. Reaction is neutral <br />to mildly alkaline throughout. <br />The soil permeability is moderate and the effective rooting depth <br />60 inches or more. The available water capacity is moderate. <br />The organic matter content in the soil layers is high and surface <br />runoff slow with erosion hazard slight. The capability subclass <br />is VIe. <br />CLASSIFICATION OF MAJOR COMPONENTS <br />Silas loam, 3 to 12 percent slopes; Family Fine, loamy, Mixed <br />Cumulic Cryoborolls. <br />INCLUSIONS <br />Included with this soil mapping unit are areas of soils which <br />have coarse loamy textures and soils having light colored surface <br />layers. <br />MAPPING UNIT 9 - IRIGUL-STARMAN CHANNERY LOAMS <br />5 TO 50 PERCENT SLOPES <br />This shallow, well-drained soil is on ridge crests and mountain- <br />. sides between 7800 to 9000 feet elevation. It formed in residuum <br />I-10 <br />