Present address: Dept. of Plant Biology, Univ. of Illinois, Urbana, IL 61801.
To whom reprint requests should be addressed.
Received for publication 30 Mar. 1987. We thank T.J. Burr of the New York State Agricultural Experiment Station, Geneva, for soil samples, and Carl Stillman for technical assistance. This work is based on a thesis submitted by A.M.B. in partial fulfillment of the requirements for the MS degree. A.M.B. acknowledges support from a National Science Foundation Graduate Fellowship and an Andrew D. White Fellowship. Reference to trade products is only for purposes of publication and does not imply approval or recommendation of the product to the exclusion of others that 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.
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