Received for publication December 17, 1973.
Research Horticulturist and Agricultural Engineer, respectively, Agricultural Research Center. The authors gratefully acknowledge the assistance of R. L. Taylor and S. P. Holliday, Research Technicians. Evaluation of source radiation and related light measurements were made by R. W. Thimijan, Agricultural Engineer.
The authors thank the Fred C. Gloeckner Foundation of New York City and the General Electric Co., Nela Park, Cleveland, OH for equipment.
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