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TABLE 9.-- PERCENT TOTAL PLANT COVER OF DOMINANT SPECIES BY SAMPLING YEAR AND SOIL THICKNESS <br />10 CM 20 CM <br />SPECIES ` 79 1981 1985 , I979 19' 1 8 1974 1.$1 19II5 1979 1981 1985 <br />7.5 1.2 <br />Agin 1.0 4.9 3.2 2.0 7.5 3. 4.5 8.0 2.0 4.0 2.6 0.% <br />0 <br />Ayer 1.0 0.5 2 7 � <br />1.5 2,3 2.0 2.6 0 4.0 2.4 0.7 <br />Qagl 0.5 0.5 2.8 � 2.0 0.6 6.5 1.5 0.9 tlp 2.5 <br />1.5 2.0 5.0 2.0 2.5 3.8 4.5 2.4 3.2 3.5 4.4 7.7 <br />Brbi 5.0 4.6 -* 1.0 8.0 -* 5.0 6. <br />8r 2.0 3.1 -* 0 0.4 4.a 0 0 2.8 ! 0 0 <br />M e e sa 8.5 47.1 73.8 5.0 42.1 61.3 8.5 41.3 73.2 1 29.5 48.6 �' <br />Weeds 7.5 10.5 4 0 ` 12.5 3.6 Q 8.0 4.3 <br />Other LS 14.45 4.4 .05 4.2 6.5 3.3 0.1 ` 4.0 6.1 �.7 1 2.5 3.7 <br />TOTAL 36.0 0.2 <br />36.Q 64.$ 87.0 1 34.5 68.0 79.7 38.5 72.9 89.7 I 57.0 79.9 92.8 <br />-* in 19$5 - 5rin and Brbi cover values were not differentiated. <br />TABLE 10.-- TOTAI. FORAGE PRODUCTION BY YEAR AND SOIL THICKNESS (Kg /ha) <br />YEAR 0 CM <br />10 CM 20 CM 30 CM 46 CM <br />* 1237 ace 1198 ac 1726 bce 2053 bde <br />1979 876 a 92 a 3095 3596 ace 4257 bce 4934 bde 1r c r. <br />1983 2732 a 3171 a ma <br />1983 27 3 ac 3134 a 3750 a 5067 b ;c .r 1985 4663 a 5236 a 5555 a 5433 a 5154 a <br />*Means within a raw followed by the sane letter are not significantly <br />different at the 0.05 level. <br />TABLE 11.-- SPECIES DIVERSITY BY YEAR AND SOIL THICKNESS <br />30 CM -- - -- <br />46 Chi <br />E'k 0 CM 10 CM <br />1978 <br />1979 <br />1981 <br />1985 <br />0.9242* <br />0.5223 a ** <br />0.4615 a <br />0.2626 a <br />1.005 <br />0.6620 a <br />0.5529 ac <br />0.3481 a <br />* Duncan's evaluation not conducted on 1978 data. <br />**Means within a row followed by the same letter are not significantly <br />different at the 0.05 level. <br />TABLE 12. -- SPECIES RICHNESS BY YEAR AND SOIL THICKNESS <br />- CM 20 CM 30 CM 46 Chi <br />Nit -- - - b GPI -- 19 <br />1978 16 16 1 16 6 a 17 17 a 19 a <br />1979 5.5 a ** 6.3 a <br />1981 7.3 acd 7.6 acd 8.9 ace 4.5 ace 3.8 a <br />1985 <br />4.8 a 5.0 a 4.2 a <br />- 20 - CM <br />1.0375 <br />0.7067 a <br />0.6284 ac <br />0.2872 a <br />1.0413 <br />0.6142 a <br />0.5920 ac <br />0.2697 a <br />0 <br />0 <br />0.9808 <br />0.7014 a <br />0.6509 be <br />0.3301 a <br />*Duncan's evaluation not conducted on 1978 Data. <br />* *Means within a row followed by the sane letter are not significantly <br />different at the 0.05 level. <br />46 CM <br />1'97 1981 81 1985 <br />4.0 8.9 <br />2.0 3.1 <br />1.5 1.5 <br />2.0 7.3 <br />4.0 9.9 <br />0 0.4 <br />8.0 45.6 <br />13.0 3.3 <br />7.5 6.1 <br />42.0 86 1 87.5 <br />1.8 <br />0 <br />6 <br />0.2 <br />64.8 <br />0 <br />0.2 <br />