Received for publication 26 Oct. 1987. Paper no. 11318 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, NC 27695-7601. The authors wish to acknowledge the technical assistance of Steve Worthington. The statistical assistance of W.H. Swallow and K.G. Haynes is appreciated. The cost of publishing this paper was defrayed in part by the payment of page charges. 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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