Research Assistant.
Professor.
Received for publication January 13, 1983. This research was supported by the College of Agricultural and Life Sciences, University of Wisconsin-Madison and by Wisconsin Agricultural Experiment Station Project No. 2378. We thank Steve Vicen for preparing the photograph. 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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