Received for publication July 16, 1977. Paper No. 5334 in the Journal Series of the Pennsylvania Agricultural Experiment Station. Part of a thesis submitted by the senior author in partial fulfillment for the PhD degree, The Pennsylvania State University, March, 1976.
Research Fellow and Professor of Plant Nutrition, Department of Horticulture. Present address of senior author is Department of Environmental Horticulture, University of California, Davis, CA 95616.
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