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Received for publication 19 Mar. 1984. Published with the approval of the Director of the Delaware Agricultural Experiment Station as Miscellaneous Paper No. 1055. Contribution No. 168 of the Dept. 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. Carboxymethyl cellulose (CMC) supplied by Hercules, Inc., Wilmington, Del., and Starchgrafted polymer (SGP104K) supplied by Henkel Corp., Minneapolis, Minn. The authors thank R.W. Lighty (Director, Mt. Cuba Center for the Study of Piedmont Flora, Greenville, Del.) for inspiring the research, and P.H. Dennison (Research Associate) for his assistance in conducting this research. 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.
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