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MIXED BRUSH TYPE, MINE AREA, t-TEST COMPARISONS <br />Degrees of <br />n x Freedom s t .05 Pooled s Pooled t t talc <br />HERBACEOUS COVER <br />1. Reference 25 32.2 24 19.68 2.06 <br />2. Study 52 18.5 51 19.22 2.00 4.15 2. 04 2.88 <br />TOTAL PLANT COVER <br />1. Reference 25 86.2 24 22.01 2.06 <br />2. Study 52 99.8 51 38.27 2.0 6.90 2. 02 1.91 <br />HERBACEOUS PRODUCTIVITY <br />1. Reference 10 58.0 9 14.24 2.26 6.54 2. 18 2.14 <br />2. Study 15 39.7 14 28.14 2.15 <br />TOTAL PRODUCTIVITY (SHRUB 6 HERB) <br />1. Reference 10 145.2 9 45.35 2.26 <br />2. Study 15 158.1 14 77.80 2.15 24.68 2 .25 0.52 <br />SHRUB DENSITY <br />1. Reference 25 5.0 24 0.87 2.06 <br />2. Study 26 5.0 25 1.46 2.06 .33 2 .06 0.0 <br />