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Contributor Notes
Received for publication March 13, 1978. Contribution from Dept. of Agronomy, Wisconsin Agric. Exp. Sta. Research supported by the College of Agricultural and Life Sciences, University of Wisconsin-Madison. Part of the research submitted by the senior author in partial fulfillment of requirement for the PhD degree. Mention of a trademark or proprietary product does not constitute an endorsement of the product by the University of Wisconsin nor does it imply its approval to the exclusion of other products 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 must therefore be hereby marked advertisement solely to indicate this fact.
Former Graduate Research Assistant (presently Assistant Professor, University of Idaho), Associate Professor, and Professor of Agronomy.
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