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9-31 <br />have low potential for dry land crop production. They are <br />Glendive and Havre (0 to 2 percent slopes) series. Two soil <br />• series are marginally suited, the Haverson and Rivra (loam) <br />series. These soils are in the capability subclass 4e. The <br />other soils at the site are not suitable, having very severe <br />limitations for dryland crop production. They are in capa- <br />bility subclasses 6e, 6w, 7e, or 7s. The soil capability <br />subclass is listed in Table 4.4-75. <br />9.4.5.2 Rangeland <br />The primary soil use within the addendum area is rangeland. <br />Soils in capability class 6 and 7 (see above) have very severe <br />limitations that make them suited only to grazing, woodland, <br />or wildlife. The soils are limited to rangeland only because <br />they are erodible or have limitations within the root zone <br />(shallow to root zone, stoniness, or salts). Some are also <br />limited to woodland and wildlife. <br />For each soil series, a range site designation is given when <br />• information is available. A range site is a distinctive type <br />of rangeland which differs from others in its ability to pro- <br />duce a characteristic plant community (USDA-SCS 1976). For <br />instance, plant communities of the Salt Flats range site <br />differ significantly in species and productivity, as do soil <br />surface textures and permeabilities from the Foothills Swale <br />range site. <br />The Salt Flats range site has a plant community that tolerates <br />highly saline soils. The Clayey Salt Desert range site, on <br />the other hand, has plant species that can adapt to and tolerate <br />clayey and saline soils in an arid climate. The Foothills <br />Swale range site has plant species that are productive on loamy <br />to sandy, deep alluvial soils. The Rolling Loam range site has <br />a diverse community indicative of loam to sandy loam surface soils. <br /> <br />