Received for publication January 15, 1976. Paper No. 4886 of the Journal Series of the North Carolina Agricultural Experiment Station, Raleigh, N.C. The use of trade names in this publication does not imply endorsement by the North Carolina Agricultural Experiment Station of products named, nor criticism of similar ones not mentioned.
Assistant Professor, Professor, and Associate Professor, respectively. The authors wish to thank Abbott Laboratories for their donation of Pro-Gibb 47.
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