Received for publication on February 26, 1979. Scientific Article No. A2569, Contribution No. 5607 of the Maryland Agricultural Experiment Station.
The authors acknowledge financial assistance from the E. I. DuPont de Nemours & Co. (Inc.), Film Department, Wilmington, DE 19898 for supplying the microfoam, Osmocote fertilizer from the Sierra Chemical Co., Milpitas, CA 95035; a financial grant from Horticulture Research Institute, Washington, D.C., and computer programing assistance from Dr. J. Bouwkamp and Mr. M. Marcotrigiano, Dept. of Horticulture, University of Maryland.
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