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Thesis (M.S.)--University of Nebraska--Lincoln, 1948. Department of Agronomy.


Copyright 1948, the author. Used by permission.


Six strains of castor bean were grown during the summer of 1947 in a randomized block design in which there were four replications. Eleven variates were measured for five plants in each plot, or a total of 20 plants of each strain.Covariance analyses were made to determine the extent to which certain of these variates are related.

The variates were: height of plant at frost, node at which first raceme occurs, days after June 30 to first flowering, days from flowering to maturity of first raceme, days after July 31 to maturity of first raceme, node of origin of lowest branch bearing a raceme, number of racemes in flower before September 1, number of racemes harvested which flowered before September 1, yield (grams) of shelled seed from racemes which flowered before September 1, average yield (grams) per raceme, number of pods in first raceme.

Results of laboratory determinations of shelling percentage, weight per hundred seeds, and oil content are also reported for each of the six strains, for racemes which flowered before and after September 1.In every case, racemes which flowered September 1 or later proved to be lower in shelling percentage, seed weight, and oil content than racemes which flowered before September 1.Oil content of the mature seed is essentially the same for all strains.It is noted that earliness appears to be associated with small seed size and high shelling percentage.

Advisor: F. D. Keim.