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IOc <br />•4, <br />• k, <br />15 <br />4 132 <br />kg N <br />per hectare <br />5 66 <br />kg N <br />per hectare + excelsior mulch <br />6 132 <br />kg <br />N per <br />hectare <br />+ excelsior mulch <br />7 66 <br />kg <br />N per <br />hectare <br />+ straw mulch <br />8 132 <br />kg <br />N per <br />hectare <br />+ straw mulch <br />The phosphorus and gypsum were surfaced applied and worked into the <br />waste material by rototilling. The nitrogen, as ammonium nitrate, was <br />added in split applications, one-half in November 1976 and the remainder <br />in May 1977. <br />The subplots were broadcast seeded with a mixture of native and <br />introduced grasses, forbs and shrubs in November 1976. The seed was <br />applied at a rate of 12.8 kg of pure live seed per hectare (634 PLS per <br />m2) and raked lightly to turn the seed under. Table 4 contains the <br />complete mixture for the Main Plot. The appropriate mulch was then <br />applied to the designated subplots (Figure 4). <br />Species Evaluation Plot. Two rows of 40 plant species were <br />seeded in two replications with three 15 foot rows per replication. <br />Nitrogen was applied at a rate of 66 kg N per hectare and phosphorus <br />at a rate of 220 kg P205 per hectare before seeding was performed. The <br />species seeded are contained in Table S. <br />Slope Plots. These plots were constructed in October 1977 on a <br />southeast -facing slope of deep mine waste material (Figure 5). One <br />plot is graded on a 3:1 slope and the second is graded to 1.5:1. The <br />three treatments used are as follows: <br />