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Thesis (M.S.)--University of Nebraska--Lincoln, 1963. Department of Agronomy.


Copyright 1963, the author. Used by permission.


As part of the corn improvement program at the Nebraska Experiment Station, the variety Krug has undergone several consecutive cycles of recurrent selection for specific combining ability. It was considered of interest to determine 1) whether the inbred lines WF9 and M14 when used separately as tester parents furnished comparable measure of yield prepotency of S1 lines obtained from the advanced cycle population; and 2) if these testcross progenies differed appreciably from the testcross evaluation obtained with the single-cross WF9 x M14. The testcross progenies with the single-cross tester were grown in yield trails in 1958 and 1959 while those with the inbred line testers were grown in 1961 and 1962. It was found that the variance associated with lines was highly significant in all experiments indicating that considerable genetic variation still exists in the population sampled.

Advisor: John H. Lonnquist.