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• Continued -- <br />Olney Progresso Sandy Loams <br />about 9 inches thick over sandstone bedrock at a depth of 24 inches. <br />The soil is mildly alkaline to a depth of L5 inches and moderately <br />alkaline below that depth. <br />Permeability of the Progresso soil is moderate. Available water <br />capacity is low. Effective rooting depth is 20 to 40 inches. Runoff is <br />rapid, and the hazard of water erosion ie very high. <br />This unit is used for rangeland. <br />The potential plant community on the Olney soil is mainly western <br />wheatgrass, blue grams, and sideoats grams. Other less numerous grasses <br />that char:.cterize this site are Indian ricegrass and needleandthread. <br />• The average annual production of air-dry vegetation is about 1,200 <br />pounds per acre. If the condition of the range deteriorates, blue <br />grams, snakeweed, pricklypear, and threeawn increase. Range seeding is <br />suitable if the range is is poor condition. <br />The potential plant community on the Progresso soil is mainly pinyon and <br />juniper and an understory of big bluestem, little bluestem, and sideoats <br />grams. The potential production of the native understory vegetation in <br />normal years is about 900 pounds of air-dry vegetation per acre. If the <br />condition of the range deteriorates, blue grams, threeawn, and skunkbush <br />sumac increase. <br />Woodland products such as firewood and pinyon nuts are avallable on this <br />unit. The stands of pinyon and juniper, however, commonly are sparse, <br />If this unit is used for homesite development, the main limitations are <br />moderate depth to bedrock aad steepness of slope in areas with a dense <br />• stand of pinyon and juniper trees. <br />