Received for publication August 11, 1978. This research was supported in part by the College of Agricultural and Life Sciences, University of Wisconsin, Madison and in part with funds from the Wisconsin Power and Light Company, Madison Gas and Electric Company, and Wisconsin Public Service Corporation and with Federal funds from the Environmental Protection Agency under Grant R803971. The contents do not necessarily reflect the views and policies of the Environmental Protection Agency or the power companies, nor does mention of trade names or commercial products constitute endorsement or recommendation for use.
The authors express their appreciation to Asgrow Seed Company for donation of seed.
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