Received for publication July 19, 1979. The Pennsylvania State University Agricultural Experiment Station Journal Series No. 5779. Portion of a thesis submitted by the senior author in partial fulfillment of the requirements for the PhD degree at The Pennsylvania State University.
Assistant Professor, Department of Horticultural Science, North Carolina State University, Raleigh, NC 27650, and Associate Professor of Horticultural Physiology, The Pennsylvania State University, respectively.
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