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Received for publication 14 Sept. 1987. Published as Miscellaneous Paper no. 1193 of the Delaware Agricultural Experiment Station. Contribution no. 222 of the Plant Science Dept. Suppliers of the materials tested are: Terra-sorb, Industrial Services International Inc., Bradenton, Fla.; Alcosorb, Allied Colloids Inc., Suffolk, Va; Laponite 445, Laporte Industries Ltd. Stallingborough, South Humberside, U.K.; and Osmocote, Sierra Chemical Co., Milpitas, Calif. Mention of trade names in this publication does not imply endorsement by the Delaware Agricultural Station of products named, nor criticism of similar ones not named. I thank The Fred C. Gloeckner Foundation, New York, N.Y. for its support of this work. 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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