Received for publication December 13, 1978. Authorized for publication as paper No. 5656 in the journal series of the Pennsylvania Agricultural Experiment Station, University Park, PA. Part of a thesis submitted by the senior author in partial fulfillment for the PhD degree, The Pennsylvania State University, November 1977.
Present address – West Tennessee Experiment Station, Jackson, TN.
Professor of Plant Nutrition, Department of Horticulture, The Pennsylvania State University, University Park, PA 16802.
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