Received for publication 11 Oct. 1983. Paper No. 8908 of the Journal Series of the N.C. Agr. Res. Ser., Raleigh, NC. The author gratefully acknowledges the technical assistance of R.R. Horton, Jr. 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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