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92 <br />shrubs and the seedin rate of shrubs er seed mixture were not <br />• 9 p <br />equivalent. They were: <br />Seeding Rate PLS <br />Seed Plixture Number of Shrubs (kg/ha) <br />1--Combination i=1~~,P-si,e.!°,'iq <br />~' 4.48 <br />2--Native,~i,, f~d.~,ie ~~~'n~''5 6.72 <br />3--Introduced ~4°D. Elgin 2 3.36 ~~ <br />Thus, shrub density response can be correlated directly with the number <br />and seeding rate of shrub species per seed mixture. In addition, the two <br />shrub species in the introduced seed mixture performed poorly. Russian <br />olive (EZdeagnus angustifolia) showed poor growth response while the <br />Siberian peashrub (Caragana arborescens) was almost a total failure. <br />Shrub density of seeded species followed a nearly identical pattern <br />• to that of the total seeded and invading species (Figure 32). This was <br />because invasion of shrub species on the study were minimal. Of the .: <br />small amount of shrub invasion that occurred, a significantly greater <br />number of invading shrubs were found in the introduced seed mixture than <br />in either the combination or native seed mixtures. <br />Effect of Seed Mixture on the Biomass of Grasses, Forbs, and Shrubs <br />An interaction between seed mixture and fertilization was detected <br />at the .0779 level for the total biomass of seeded and invading species <br />(Appendix A, Table 10). The combination seed mixture showed a much <br />better response to Fertilization Treatments 1 and 2 (varying levels of <br />phosphorus only) than did either the native or introduced seed mixtures <br />(Figure 32). But, when fertilizer was not applied, the native seed mix- <br />• ture had significantly higher biomass than the introduced seed mixture. <br />