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Thesis (M.S.)--University of Nebraska--Lincoln, 1966. Department of Agronomy.


Copyright 1966, the author. Used by permission.


Three varieties of castorbeans together with their hybrids and populations which have undergone phenotypic recurrent selection for early seedling emergence and vigor, per se, were studied for early plant vigor. Traits studied were percentage and rate of germination and seedling emergence, growth in height and dry matter accumulation, leaf area production and plant width. These studies were done in the field in 1964 and 1965, in the germinator and in the greenhouse in 1965.

Selection for early plant vigor was not effective in all the selected materials. Laboratory germination and greenhouse seedling emergence results did not agree with those from the field tests. Selection for early seedling emergence was accompanied by increased plant height and rapid growth. The selected materials were better than the unselected material in dry matter accumulation. All the materials which had undergone selection for early emergence had a higher but non-significant rate of leaf area production than the original unselected materials. Selection for early emergence did not increase plant width.

Advisor: James H. Williams.