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There was no significant difference between plant values in plots with and without phosphorous for 1986 ana 1987. For both 198ti and 1987, the application of either Brominal or Glean resulted in significantly more plants than no application of herbicide (P equals 0.01). For 1986, the application of Glean resulted in significantly more plants than did the application of Brominal (P equals 0.051, and the early application of Glean resulted in significantly more plants than did the late application of Glean (P equals 0.05). By 1987, however, there was no significant difference between Brominal and Glean (P greater than 0.10), and there was no significant difference between the early and late application of Glean (P greater than U.10). Either herbicide was effective in significantly improving plant establishment, while the time of application was not critical if current labeling is followed. The percent of weeds was not significantly different (P greater than 0.10) between 1986 and 1987 far the seed mixtures or for imprinting and nonimprinting. Also, there were no significant differences (P greater than 0.10) in the plots with and without mulch in 1986 and the plots with or without phosphorous in 1986. However, in 1987 there was a significantly (P equals 0.05) higher percentage of weeds in the plots with mulch than those without mulch, and in 1987 the percent of weed was significantly (P equals 0.10) higher in plots with phosphorous than those without. For both 1986 and 1987, the application of either Brominal or Glean resulted in significantly fewer weeds than no application of herbicide (P equals 0.01). In 1986 and 1987, there was no significant difference between Brominal and Glean (P greater than 0.10) in the percentage of weeds, and there was no significant difference between the early and late application of Glean (P greater than 0.10). Both herbicides were effective in controlling these weeds. Seed mixture B was the mosf. cost effective seed mixture used on this site. The most cost effective treatments for seed mixture B were late Glean, Brominal, and early Glean. Table 8 provides the cost effectiveness for all treatment combinations for each seed mixture. When treatment combinations involve a herbicide application, the cost effectiveness of imprinting, phosphorous, and mulch are significantly reduced due to the presence of the relatively low cost herbicides. RE COIIFIENDATIONS FOR TEST PLOT DESIGN When developing seed mixtures, keep them simple and utilize species that are easily differentiated. Questionable adapted species should be planted only in single species evaluation rows.