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24 <br /> <br />the greatest grass and forb cover, 18.4 and 7.3 percent respectively, of <br />any treatment. The marked differences between mulched and unmulched <br />treatments in grass and forb cover can be observed in Figures 6 and 7 . <br />Following the third growing season, mulched subplots supported the vegetation <br />with the highest cover and density values. The overall success of seeded <br />vegetation in the mulched treatments suggests strongly that mulch will be <br />a necessary part of the reveaetation techniques applied at this site in <br />the future. Excelsior mulch did not produce plant cover values signifi- <br />cantly different from those found in the straw mulched treatments. <br />• <br />Nitrogen and phosphorus fertilizers are needed to provide nutrients <br /> <br />for establishment and continued growth. This is evidenced by the <br />lower cover and density values found in the vegeta*_ion of the Absolute <br />Control. There was no statistically significant difference in density or <br />cover values far total seeded species between the 66 and 132 kg per hectare <br />of nitrogen in any treatment, suggesting the extra increment of nitrogen is <br />not necessary. Adequate nitrogen to meet the requirements of the species <br />seeded appears to be supplied by the application of 66 kg of nitrogen per <br />hectare. This amount should be sufficient for establishment of vegetation <br />on level areas of the coal slack waste dump if it is applied with an effec- <br />tive mulch. <br />No significant difference (? < .10) was found between the treatment <br />halves amended with gypsum and those that were noL amended with gypsum. <br />in TUL'1r_ 'aOriC, 1L ,:+025 nOt appear that gyps,:m w111 need to 02 applied :~ <br />the Codl 'daSL°_ 'ndLeridl. QUd11t3ilVe ObS2rVaL10nS indlCdLe gypsun aepress2s <br />plant vigor in many treatments and hinders revegetation. <br /> <br />