1Received for publication January 4, 1978. Scientific Journal Series Paper No. 9824. Minnesota Agricultural Experiment Station.
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.
2Graduate Research Assistant and Professor, respectively.
3We acknowledge Kay Sargent, Lab Technician, for her assistance in acquiring data.
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