Received for publication 19 June 1984. Paper number 9259 of the J. Ser. of the N.C. Agr. Res. Ser., Raleigh, N.C. Use of trade names does not imply endorsement by the N.C. Agr. Res. Ser. of the products named nor criticism of similar products not mentioned. 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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