Professor of Plant Nutrition.
Received for publication 3 Oct. 1983. Contribution No. 26, Dept. of Hort. Authorized for publication as paper No. 6767 in the Journal Series of the Pa. Agr. Expt. Sta. 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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