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• The potential plant community on the Pinon and Bowdish soils is <br /> pinyon pine and Utah juniper with an understory of Indian ricegrass, <br /> muttongrass, and Gambel oak. The average annual production of air-dry <br /> understory vegetation is about 300 to 800 lbs. per acre. <br /> If the condition of the understory deteriorates, cheatgrass, annual <br /> mustards and prickly pear cactus increase. Where the understory is in <br /> poor condition, these plants are dominant. Grazing should be managed <br /> so the desirable balance of species is maintained in the plant community. <br /> Removal of pinyon and juniper increases the production of understory <br /> forage. Range seeding should be done in conjunction with removal of <br /> the overstory. This would improve the understory while providing firewood <br /> and posts. <br /> • These Pinon and Bowdish soils are capable of producing nine to <br /> fifteen cords per acre in a stand which will average five inches in dia- <br /> meter at a height of one foot. Young pinyon pine are desirable as Christmas <br /> trees. The main limiting soil..feature is the very high hazard of erosion. <br /> Minimizing the risk of erosion is essential in harvesting timber. The <br /> very low available water capacity of the soil and the limited rooting <br /> depth can influence seedling survival. <br /> The potential plant community on the Progresso soils is mainly <br /> muttongrass, western wheatgrass, Indian ricegrass, and Wyoming big sage- <br /> brush. The average annual production of air-dry vegetation is about <br /> 1,100 lbs. per acre. <br /> If the condition of the range deteriorates, cheatgrass, broom snake- <br /> weed, and scattered pinyon pine and Utah juniper increase. Where the <br /> -17- <br />