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Contributor Notes
Present address: Dept. of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843.
Received for publication 22 Apr. 1985. Oklahoma Agricultural Expt. Sta. J. no. 4796. Grateful acknowledgement is given to G. Phil! Whitten for technical assistance in chamber construction. Mention of a trademark, proprietary product, or vendor does not imply its approval to the exclusion of other products or vendors that also may be suitable. 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.
