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This research was supported partly by the Research Committee of the Graduate School with funds supplied by the Wisconsin Alumni Research Foundation. Publication approved by the Director of the Wisconsin Agricultural Experiment Station.
Present address: Department of Plant Physiology, College of Agriculture, University of Poznan, Poland.
Department of Forestry.
The cooperation of Professor Jan Wojcie-chowski of the Department of Plant Physiology, College of Agriculture, Poznan, Poland in providing the experimental cuttings is acknowledged.
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