Received for publication October 8, 1980. Paper No. 6646 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, NC. The use of trade names in this publication does not imply endorsement by the U.S. Dept. of Agriculture or N.C. Agricultural Research Service of the product named, nor criticism of similar ones not mentioned.
The author thanks Dr. L.G. Wilson, Extension Horticultural Specialist, for assistance in establishing study.
Plant Physiologist, USDA, SEA, AR, North Carolina State University, Raleigh, NC 27650.
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