Received for publication 10 Apr. 1986. Maine Agricultural Experiment Station Publication no. 1142. I acknowledge the cooperation and technical assistance of Walter J. Grant, David B. Torrey (ARS/USDA, New England Plant, Soil and Water Laboratory), John R. Harker and Nancy L. Morse (Maine Agricultural Experiment Station), and advice on statistical aspects from William A. Halteman (Univ. of Maine). 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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