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Contributor Notes
Received for publication February 2, 1983. Published with the approval of the Director of the Delaware Agricultural Experiment Station as Miscellaneous Paper No. 1011. Contribution No. 156 of the Department of Plant Science. Mention of trade names in this publication does not imply endorsement by the Delaware Agricultural Experiment Station of products named, nor criticism of similar ones not named. Laponite 445 gel supplied by Laporte (United States), Inc., Hackensack, N.J. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
Assistant Professor.
Undergraduate Student.
