Received for publication 18 Mar. 1983. Mention of trade names or commercial products does not constitute endorsement or recommendation for use. 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.
Plant Physiologists, ERL, U.S. Environmental Protection Agency, Corvallis, Ore.
Senior Scientists, Northrop Services, Inc., Corvallis, Ore.
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