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The Surface Mining Control and Reclamation Act of 1977 rqulres that surface-mined land be revegetated wlth “the same seasonal variety”, meaning species of the same season of growth as the species native to the area. Our objective was to compueseasonof-grwing use of p8stures comprised of introduced cool-season species with pastures comprised of a mix of native warmand cool-season species. Tbe study was conducted on surface-mined land neu Center, North Dakota, dominated by smooth bromegrass (Broruus iuerm& Leyss.) and alfalfa (Mcdicogo sativa L.) and on adjacent unmlned mixed prairie. Pastures were 1.86 ha in size and stocked with 2 yeulhtg steers (Bos spp.) each. Graxhtg was started in May or June and ended in late September or early October for 96 days in 1982 and 126 days each in 1983,1984, and 1985. Liveweight gahr increased from mid June through August and then remained constant on all pastures. Herbage dry matter yield from reclaimed pastures was qua1 to or greater than yield from native pastures each year. The season-of-graxhtg use was no different for rechtimed cool-season pastures than for native mixed prairie, and there was no evidence that species with the same growlng season as those native to the area were necessary to provide season-long grazing use. Cool-season forage species ue easier to seed, establish, l nd less expensive to buy and can be used to revegetate surface-mined land for season-long graxhrg use.

Animal Performance and Plant Production from Continuously Grazed Cool-Season Reclaimed and Native Pastures