Scientific Journal Series Article 10,438, University of Minnesota Agricultural Experiment Station, Saint Paul, MN 55108.
Graduate Student, Department of Horticultural Science and Landscape Architecture.
Professor and Head of the Department of Horticultural Science and Landscape Architecture.
The authors wish to thank D. W. Davis, M. L. Brenner, University of Minnesota; C. M. Rick, University of California, Davis; W. H. Gableman, University of Wisconsin and H. M. Munger, Cornell University for their suggestions in preparing the manuscript.
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