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4 <br />The objectives of the Canon City Dolomite Quarry study are: <br />To determine the most successful species to establish by seeding; <br />To determine the nitrogen fertility level, with phosphorus and <br />potassium held constant, that supports the most vigorous <br />growth of seeded species; <br />To determine the effect of mulch, with nitrogen, in supporting <br />the vigorous growth of seeded species. <br />Methods <br />Plot Construction <br />The test plot was established in the fall of 1976 on a level waste <br />dump designed to simulate conditions following mining. Subplots measuring <br />3.65 m by 7.62 m were arranged in a randomized block design of three repli- <br />cates containing seven treatments (Figure 1). All treatments other than the <br />absolute control received an uniform application of 22~ kg of P206 as <br />triple superphosphate and 66 kg of K20 as muriate of potash per hectare. <br />The following seven treatments were established: <br />Treatment <br />1 Absolute Control (no fertilizer, no mulch) <br />2 Phosphorus/Potassium Control <br />3 66 kg N per hectare <br />4 132 kg N per hectare <br />5 66 kg N per hectare + excelsior mulch <br />6 132 kg N per hectare + excelsior mulch <br />The phosphorus and potassium were surfaced applied and worked into <br />the waste material by rototilling. The nitrogen as ammonium nitrate was <br />