Received for publication March 13, 1972, Paper No. 3707 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh.
Graduate research assistants and Professor of Horticultural Science, respectively. This research was made possible by a research grant from the Fred C. Gloeckner Foundation. The authors express their thanks to Herb Kirk and L. J. Kushman for their assistance with the statistical analyses, and the LTDM, respectively.
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