Libraries at University of Nebraska-Lincoln


Document Type


Date of this Version



Thesis (M.S.)--University of Nebraska--Lincoln, 1961. Department of Agronomy.


Copyright 1961, the author. Used by permission.


The objectives of the present study were (1) to study the relative behavior of two groups of lines previously selected for general and specific combining ability, in combination with a diverse set of single crosses representing a sample of the single cross testers being used in the corn belt and (2) to determine whether selection for specific combining ability with a particular single cross restricted, in any way, the utility of these lines in combinations with other single crosses as compared to lines selected for general combining ability.

Two groups of lines derived from K1 Synthetic, one group previously selected for specific combining ability with the single cross (Wf9 x M14) as the tester and the other group previously selected for general combining ability by using the parent variety as the tester, were compared in crosses with four single cross testers for two years 1959 and 1960. The testers constituted a random sample of the possible single cross testers which might be used in the corn belt breeding programs. The pertinent components of variance resulting from the main sources of variation and their sub-divisions were estimated from the analysis of variance and their approximate confidence limits were calculated. The relative ranking of the lines by the individual testers was studied by the calculation of correlation coefficients.

Advisor: John H. Lonnquist.