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28 • Switchgrass and sideoats grama although not found in this area on the Deep Sand Site, established and grew well. Small amounts of these two species could be considered in seed mixes for the area. Although giant dropseed and sand lovegrass did well they may not persist on this site and are not recommended. The introduced species were all fast to germinate and were severely grazed. The introduced grasses are cool-sea- son and grew slowly in mid-summer in comparison to the warm- season grasses. At this time none of the introduced species are recommended in revegetation of extensive drastically- disturbed sand areas. Detailed information on this study is given in Appendix D. Species Established From Seed Mixture On the irrigated mulch plots a mixture of grass species indigenous to the site plus sideoats grama and little bluestem was seeded on 24 May 1978. The species composition on these plots was measured on 18 July (Table 6). Establishment of blue grama was outstanding. Apout twice as many sand dropseed plants were present as there were seeds applied. This is because there was considerable seed of this species present in the topsoil. Establish- ment of prairie sandreed, western wheatgrass and sand bluestem was fair considering the number of seeds planted. In future plantings the rate of sand bluestem seeded should be doubled. Establishment of sideoats grama was relatively low in view of past experience in seeding this species. It was difficult to distinguish sideoats grama seedlings from blue grama seedlings in the field, thus, it is believed the density of sideoats grama may be greater than indicated because some may have been included as blue grama. Stands of Indian ricegrass were sparse, this is the usual case as this species has considerable hard seed (80-958) that will not germinate the year of seeding. i