Optimal planting times for freshly lifted bare-rooted conifers on the North York Moors |
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| Authors: | McKAY H M |
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| Institution: | Forestry Commission Research Agency, Northern Research Station Roslin, Midlothian, EH2S 9SY, Scotland |
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| Abstract: | Two-year-old Picea sitchensis (Queen Charlotte Islands and Oregonprovenances), Pseudotsuga menziesii, Larix kaempferi, Larixeurolepis, Pinus sylvestris and Pinus nigra var. maritima werelifted at intervals during two winters and planted within 24h on a nearby second rotation site. Physiological conditionat planting, measured by root growth potential and fine rootelectrolyte leakage, and outplanting performance were significantlyinfluenced by lifting date. There were consistent differencesin the species' response to lifting date. Planting out in Septemberresulted in poor survival. Survival of P. sitchensis liftedin October until April was >90 per cent. Pinus sylvestrisand P. nigra had survivals of >90 per cent when lifted inNovember and January respectively until March. There was noclear pattern in P. menziesii performance. Both L. kaempferiand L. eurolepis had two periods of good survival—Octoberand March—with significantly poorer survival and growthassociated with mid-winter planting. The double peak in larchperformance was closely related to root growth potential; lowmid-winter establishment was associated with root growth potentialsof <5 even though the nursery root systems were in excellentcondition as assessed by electrolyte leakage. |
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