Comparison of S2 Progeny And Inbred Tester Methods for Improvement of Maize
Comparison of S2 Progeny And Inbred Tester Methods for Improvement of Maize
Ameha, Mesfin
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. , 8 for the hybrids AS., is the interaction effect of the i th location and kth treatment 27 Ej,..., is the error term of the (jth unit in the i th location, jth block, and kth treatment. All factors except the blocks are fixed. The combined AOV for the adjusted yield was as follows: Sources p_f SS MS_ Locations (L) I- 1 SS MS. Blocks/Ls (r } - 1) + (r 2 - 1) SS 2 MS 2 Treatments (T) t - 1 SS, MS, L x T (L - I) (t - 1) SS^ MS^ Error [(r ] - 1) + (r 2 - 1)] x (t - 1) SS MS The two breeding met...hods were compared using Duncan's new multiple- range test and single degree of freedom contrast following the procedure shown in Steel and Torrie, I960. RESULTS Testcrosses Mean squares and F ratios from the analysis of testcross yield data involving four selected groups of inbred lines from each population in crosses with three testers are shown in Table 3. In both populations there were highly significant differences among groups averaged over testers, and the tester x group interaction was significant at the 0.05 level in Population A and at the 0.01 level in Population B.
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