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coarseness of the mulch and the level site, it was not necessary to crimp tiie mulch into the soil, and no movement of the mulch was ever noticed. Next, the land imprinter was used on half of each of the seed mixtures. Imprinting is a mechanical soil treatment where a large heavy cylinder with a geometric pattern of projections is pulled behind a tractor. As the cylinder rolls on the soil surface, the projections "imprint" small depressions. The imprinter creates surface roughness whicn concentrates precipitation for seedling establishment. The single species evaluation rows were seeded on the southern end of the plots (Figure 2) using a hand operated, sinyle row drill. Each species used in the three seed mixtures was planted, in addition to five sterile annuals and several other species that the UCEPC wanted to evaluate. The single species rows were 70 feet long, planted 1 foot apart, and replicated twice. On November 1 through Novembers, 1983, the test plots were fenced using woven wire to exclude livestock. In the spring of 1984 chicken wire was installed around the entire enclosure for rabbit and prairie dog control. The chicken wire was buried 6 inches deep and extended 2.5 feet above the ground surface on the outside of the woven wire. On April 19, 1984, Glean was applied to half of each plot scheduled to receive Glean herbicide. The application of Glean was split on the designated plots since the grass had already started to germinate by the day of the early application. The 1984 label did not recommend applying Glean directly on germinating grass. As a result, an additional late application on the other half of the plots was applied after a significant amount of the grass had emerged. Partially as a result of this project, the Glean label ryas changed to permit its use for grass establishment. It was applied at a rate of 1/3 ounce per acre using a truck mounted sprayer. It was intended to be applied at a rate of 1/6 ounce per acre, but the higher rate resulted from starting and stopping the truck on the plot margins. Glean has soil residual pproperties for about a year and can be used as a pre or post-emergent on broadleaves. On flay 18, 1984, Glean was applied to the second half of each plot scheduled to receive Glean. It was applied at a rate of 1/6 ounce per acre using a constant pressurized backpack sprayer with a 10-foot boom. Brominal was also applied that day at a rate of 1 pint per acre using tire same backpack sprayer. Brominal is a nonpersistent contact broadleaf herbicide. The cost of each treatment and seed mixture was calculated by SCS in lurch of 1985 using representative values for northwest Colorado (Table 3). EVALUATION PROCEDURE The sinyle species plots have been evaluated twice a year, in the spring and fall, since the spring of 1984. Height measurements have been recorded along with an abundance rating using 0 for none and 4 for abundant. Seed 14ixture Plots The plots have been monitored each year since their establishment in the fall of 1983, thouyh significant reductions in the BLt•i technical investigation budget has hindered extensive monitoring of the 288 plots. 3