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Abstract
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Contributor Notes
Received for publication May 18, 1972. Research supported by the College of Agricultural and Life Sciences, NDEA-Title IV, and the Graduate School. This research was conducted in partial fulfillment of the requirement for the PhD degree by the senior author. University of Wisconsin, Department of Horticulture, Madison, Wise. 53706.
The authors express appreciation to V. E. Schull, Michigan State University, East Lansing, for his expert assistance in the microprobe analysis.
Department of Horticulture, Pennsylvania State University, University Park.
Professor and Associate Professor respectively, Department of Horticulture.
Abstract