Received for publication February 24, 1983. Purdue University Agricultural Experiment Station Journal Paper No. 9378. Project conducted in partial fulfillment of the PhD. Research was supported in part by grants from The Horticultural Research Institute, The Indiana Division of Highways, and U.S. Dept. of Transportation; Federal Highway Administration, Grant No. C-36-48H. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
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