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Evaluation of selected grasses for the revegetation of a coal slurry lagoon in western Kentucky by direct seeding

The research was conducted on the intermediate zone of a 23 ha slurry impoundment located on the Gibraltar Mine, near Central City, Kentucky. Two separate experiments were established. In the first, cultivation was carried out using a conventional disc and in the second, an `Aer-way` attachment was used. The experimental plots, each measuring 4 m x 3 m, were prepared and seeded in June 1993. Percentage cover results were estimated by field observation in September 1995. In the experiment where cultivation was carried out using a conventional disc, the greatest mean percentage cover levels with sideoats grama `El Reno` (55%) being the best entry. For the second experiment, the highest percentage cover was obtained for switchgrass `Alamo` (38%). These values reflect do not include weeds which averaged in the 40-50% ranged and most plots had 90-95% vegetation cover. Results for the cool-season species were generally disappointing and may have been due to late seeding-date. This study revealed that warm-season grasses, especially the tall-grass prairie species, produced reasonable stands on coal slurry after just two years.