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At Red Rock Nursery overwintering bare-root lodgepole pine and interior spruce nursery stock, stored at 2°C, was reported to suffer substantial losses. The damaged seedlings showed signs of rotting and molding. An investigation was carried out to see if the post-storage field survival and growth of these trees would be improved by using subfreezing storage at -2°C and by using an alternative packing method, with roots facing inside the storage carton, instead of facing outside.
In November, 1974, 2-0 seedlings of lodgepole pine and interior spruce, grown at Red Rock Nursery, were lifted , packed and stored at two different temperatures, 2°C and -2°C. After storing for 6 months, the seedlings were planted in the field. Results showed that, when compared with 2°C storage, seedlings stored.at -2°C showed no rotting of foliage or shoot apex, no molding, a slower rate of starch depletion and a higher electrical impedance. First year planting assessment indicated a higher survival percentage and greater height growth for seedlings stored at -2°C. The two different packing methods tested showed no difference in after-storage responses, but a slightly higher survival rate was obtained at each of the two temperatures when roots were packed facing inside the carton.
These results have been accepted and implemented on a production basis by the Reforestation Division. Detailed information on this subject may be obtained from Dr. K.W. Cheung, Research Division, B.C. Forest Service, Legislative Buildings, Victoria, B.C. V8V 1X5.
[Abstract contains full text of memo.]
BC Forest Service - Research Division. 1977. Effect of subfreezing storage temperature on overwintering lodgepole pine and interior spruce seedlings grown at Red Rock Nursery (E.P. 737.01). British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development. Research Memo (FLNRORD). RM12
Topic: FLNRORD Research Program
Keywords: FLNRORD, Research Memo, British Columbia
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