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to <br />Of the two treatments where shrubs showed the highest cover values, <br />the Phosphorus/Potassium Control also demonstrated vegetation with the <br />highest cover value of all treatments for total seeded plant cover (Figure <br />3 ). Complete means for each treatment are found in Appendix Table 4. <br />The severe weather diminished the presence of invading species, princi- <br />pally kochia (Kochia scoparia). Densities were high early in the summer, <br />ranging from 60 plants per m2 in the absolute control to 290 plants per m2 <br />in the 132 kg N per hectare treatment. However, they were small plants <br />and due to the dry weather few matured to set seed. <br />Several seeded species succumbed during the dry second growing season. <br />The species found to be most successful following the third growing season <br />are given in Table 3 . <br />Mulching did not significantly increase density or cover of seeded <br />species. The coarse texture of the waste material allows rapid water infil- <br />tration, deeper water storage and restricted soil surface evaporation. In <br />effect, the waste material acts as a gravel mulch. <br />following the third growing season, the potential community offering <br />the highest cover, biomass and site stability appears to be a community <br />dominated by shrubs, with an understory of perennial grasses and forbs. <br />The Phosphorus/Potassium Control and the 132 kg N per hectare treatments <br />have supported the best growth for this type of vegetation. <br />The growth rate of shrubs is often slow, when compared to that of <br />grasses and forbs. Continued observation is necessary to further gain <br />knowledge of how the seeded and invading species will form communities in <br />the treatments. Much of the quarry waste lies on slopes and further exper- <br />imentation in these areas will provide needed information for a large scale <br />revegetation program. <br />