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Thesis (M.S.)—University of Nebraska—Lincoln, 1958. Department of Agronomy.


Copyright 1958, the author. Used by permission.


The superior yielding ability of hybrid grain sorghums over standard varieties has been verified in numerous yield tests conducted during the past few years. At yield levels ranging between forty and eighty bushels per acre, the best hybrids have in many tests exceeded the highest yielding varieties by twenty to thirty per cent. Whether this relationship is maintained at higher and lower yield levels is not known. One of the objectives of the experiment reported in this thesis was to compare sorghum varieties and hybrids grown in a wide range of yield levels.

In order to specifically determine the causes of hybrid superiority, the components of yield, including seed size, the number of seeds per head, the weight of grain per head and the number of heads per plant, were investigated.

Advisor: Orrin J. Webster