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Forty percent of 3-year-old blue spruce seedlings survived 21 days under aerated, submerged conditions all died after 28 days. Seeds should be sown into containers filled with a good quality general potting.1.25 to 47. Get a printable copy (PDF file) of the complete article (523K), or click on a page image below to browse page by page. Blue spruce nursery stock is more drought resistant than other spruce species, and it can withstand temperatures to -40 degrees Fahrenheit (-40 deg C). After around 4 weeks under these conditions the seeds are ready to be sown.
BLUE SPRUCE SEEDLINGS FULL
Full textįull text is available as a scanned copy of the original print version. Features unique silvery blue-green color year-round Known as a very adaptable evergreen Is deer-resistant, seldom experiencing severe damage Provides privacy.
The similarity of results obtained using the low intensity, long duration as against the high intensity, short duration light treatments suggests that the law of reciprocity applies in this response. The results imply that the phytochrome system mediates the photoperiodic control of dormancy in blue spruce seedlings. Two-hour light breaks of far red light (1.80 μw/cm 2 at 730 nm), red light followed by far red light, or low intensity white light were not effective in delaying dormancy. Dormancy was prevented under 12-hour photoperiods by 2-hour light breaks of red light (1.70 μw/cm 2 at 650 nm) or high intensity white light (2,164.29 μw/cm 2 at 400 to 800 nm) given in the middle of the 12-hour night, and by continuous low intensity white light (204.76 μw/cm 2 at 400 to 800 nm). Blue spruce ( Picea pungens Engelm.) seedlings grow continuously when exposed to photoperiods exceeding 16 hours and enter dormancy within 4 weeks under photoperiods of 12 hours or less.
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