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Received for publication October 25, 1971. Scientific Journal Series Paper No. 7733 of the Minnesota Agricultural Experiment Station. This research was supported in part by a grant from the Louis W. and Maud Hill Family Foundation.
Laboratory of Plant Hardiness, Department of Horticultural Science.
Present address: Research Station, Canada Department of Agriculture, Harrow, Ontario.
The authors express their thanks to Akira Sakai for his advice and assistance in the execution and presentation of this research.
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