Assistant Professor, Dept. of Agronomy.
Professor, Dept. of Horticulture.
Received for publication 9 Feb. 1987. Research was partially supported by the Fred C. Gloeckner Foundation. Critical review of this manuscript by L.W. Zelazny is gratefully acknowledged. 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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