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Frost-hardiness changes in three Douglas fir provenances at each of three nurseries were followed from September, 1968, to April, 1969, by measuring electrical impedance of stems. Nursery had a greater effect on hardiness than provenance, with seedlings at one nursery reaching the same level of hardiness two weeks earlier than those at another nursery. Detection of these hardiness differences shows the practical value of the impedance method for measuring frost-hardiness.

Measurement of Frost-hardiness in Douglas Fir at Three Nurseries by an Electrical Method