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<br />just slightly less steep than the angle of repose. Its success, <br />although little more than a moderate success, indicates that with deep <br />rooted species these sand slopes can 6e revegetated assuming the slope <br />is not steeper than about a 3: 1. <br />It is also interesting to note that some native species also invade <br />• <br /> <br />this same dry, steep, south-facing slope. The grasses and weeds are <br />rather far and few between, but their presence is important. Much of <br />the lack. of success is apparently due to the aspect which is south as <br />well as the slope. The west facing slope below Academy Blvd. is quite <br />well vegetated with grasses even though only slightly less steep than <br />the south facing slope, This suggests that aspect is very important to <br />the success of the revegetation and that measures should be taken to <br />improve the moisture/temeprature conditions of the south-facing slopes. <br />These measures should include the use of soil if at all possible and <br />reduced slope gradient. Another ingrediant of success would also be the <br />use of deep rooted plants to provide a better environment for the <br />grasses. <br />This latter paint was well demonstrated at the Castle Concrete <br />Company Hobson Fanch Pit located about 20 miles west of Pueblo. At this <br />location a sandy loam soil was placed to a depth of about 'a to 5 feet <br />over a silt to clay layer. Alfalfa was planted to a rather high density <br />along with suitable pasture grasses. Without the alfalfa it is believed <br />that the grass success would have been quite poor, but the alfalfa <br />provided two ingrediants that were important for success, one was shade <br />to help cool the sail and hold surface noisture in a zone available to <br />young grasses. The other was nitrogen in a form that produces the <br />F'AGE 6 OF 8 - EXHIBIT E <br />