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Proposed dates for lifting Sitka spruce planting stock for fresh planting or cold storage, based on physiological indicators

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Abstract

The relationship between physiological status and theability to withstand the stresses of lifting, coldstoring and planting was evaluated from 1992–1995 inSitka spruce (Picea sitchensis (Bong.) Carr.)2 + 1 transplants of Washington/northern Oregon originsgrowing in Ireland. Needle primordium initiationcontinued until later and cold hardiness developedmore slowly in the mild lifting season of 1994/95. The seasonal decline in shoot mitotic activity wasgenerally similar each year, with apices becominginactive in December. Cell divisions in roots ceasedin November or December. Shoots began to deharden inearly February each year, but the rates of dehardeningwere slow until March. Cell divisions in root apicesresumed in February each year, compared with March forshoot apices. The vitality of the seedlings followingcold storage was high for most lift dates except theOctober and April dates. The period of highest stressresistance (as indicated by cold hardiness levels) forlifting for immediate planting was from about lateNovember/early December to early March; shoots werecold hardy to about −20 °C (LT50) at thistime. Seedlings could be lifted and cold stored (1–2 °C)until May/June when shoots were cold hardyto about −30 °C or lower, which coincided withthe period from mid- to late December until March.

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Authors and Affiliations

  1. Department of Crop Science, Horticulture and Forestry, Faculty of Agriculture, University College Dublin, Belfield, Dublin 4, Ireland

    C. O'Reilly, N. McCarthy & C. Harper

  2. Research and Development Division, Coillte Teo, Newtownmountkennedy, Co., Wicklow, Ireland

    M. Keane

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  1. C. O'Reilly
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  2. N. McCarthy
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  3. M. Keane
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  4. C. Harper
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O'Reilly, C., McCarthy, N., Keane, M. et al. Proposed dates for lifting Sitka spruce planting stock for fresh planting or cold storage, based on physiological indicators. New Forests 19, 117–141 (2000). https://doi.org/10.1023/A:1006683118155

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