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Contributor Notes
Received for publication January 25, 1980. Pennsylvania Agriculture Experiment Station Journal Series No. 5892. From a dissertation submitted by the first author in partial fulfillment of the requirements for the PhD degree at The Pennsylvania State University. Support through US DOE Contract EC-77-S-02-4397 is acknowledged.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
Present Address: Department of Horticultural Science, Box 5216, North Carolina State University, Raleigh, North Carolina 27650.
Abstract
