Received for publication February 12, 1970
Paper No. 3647 in the Journal Series of the Pennsylvania Agricultural Experiment Station, University Park, 16802. Appreciation is expressed to Dr. Richard Craig, Department of Horticulture, for. help with the computer programs and statistical analysis. This research has been supported in part by funds received from the UniRoyal Chemical Division of UniRoyal, Inc., Bethany, Conn.
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