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Thesis (M.S.)--University of Nebraska--Lincoln, 1959. Department of Agronomy.


Copyright 1959, the author. Used by permission.


The development of a synthetic variety of corn for the low lands of Colombia has been of major importance in the corn breeding program. This study reports on the initial phases of that development. Correlation studies of agronomic characteristics were also made using the materials available from this program.

The variety cross Rocol V.1 x Eto blanco was considered as a suitable start because of the desirable agronomic characteristics of Eto and the good grain yield of Rocol V.1. Plant and ear height, ear length, kernel length and indentation were measured throughout the selection testing period. Correlations studied indicated that vigorous plants with longer ears, longer kernels and dent type of kernel tend to produce better yielding topcrosses. The undesirable characters of Rocol V.1, such as plant and ear height and indentation were improved with the formation of a synthetic variety using the procedures of selection based upon topcross performance. The undesirable characters of Eto blanco, such as low yield grain production and kernel length were also improved. The realized improvement of plant and ear height, ear and kernel length, indentation and yield would indicate the presence of considerable additive genetic variability in the material used.

Advisor: John H. Lonnquist.