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• GP,ASSES <br />After four complete growing seasons, the 1975 seedings have <br />produced excellent stands for most of the grass species (Table ) <br />In particular the wheatgrasses and wildryes were extremely vigorous, <br />- and thusly inhibited.invasion by volunteer species within the <br />seedings. Biomass production for the wheatgrasses seeded in 1975 <br />ranged from 1835 k9/ha to 3072 kg/ha (Appendix Table ). Biomass <br />production for the wildryes ranged from 1099 kg/ha to 4931 kg/ha. <br />Native grasses such as Bromus marginatus and Stipa Columbiana <br />have established well and should be considered in the composition <br />of a "native mix". Bluegrass and fescue stands are improved over <br />last year and now provide a moderate amount of cover. <br />• Species seeded in the spring of 1976 have far the most part <br />established stands comparable to those seeded in the fall of 1975. <br />The exception to this is sudangrass, an annual planted simply to <br />evaluate asa cover crop. Good cover was provided by late summer <br />in 1976 but no sudangrass reestablished from seed in following <br />years. sudangrass should definitely be considered if a warm <br />season cover crop is to be used in a reclamation program. <br />The species seeded in the fall of 1976 have produced extremely <br />sparse stands. This reflects the extremely low 1976 winter and <br />1977 spring precipitation experienced at the Colowyo site. <br />• <br />