Overwinter and Spring Storage of Pine and Spruce Seedlings

Abstract

Several storage treatments at 20°C and -5OC were evaluated by late spring transplantings for fall and spring lifted 2-0 seedlings of Pinus sylvestris L. and Picea pungens Engelm. Survival and growth of the 2-2 transplants for both \ species, after overwinter or early spring storage at 2OC as bare-root plants in sealed 4-ml poly bags, equalled the performances of freshly-lifted seedlings. Both of these treatments proved practical and efficient alternatives for delayed spring transplantings. Overwinter storage at -5OC apparently reduced transplant survivals of immature Colorado spruce seedlings and proved lethal for Scots pine seedlings lifted on October 16.Plusieurs modes d'entreposages a 2OC et a -5OC ont 6te evalues dans des essais de repiquages tardifs pour des semis 2-0 de pins sylvestres (Pinus sylvestris L.) et d'epinettes du Colorado (Picea pungens Engelm.) extraits a I'automne et au printemps. La survie et la croissance des plants 2-2 pour les 2 esphces extraits au printemps ou a I'automne et conserves a 2OC dans des "poly bags" hermetiques de 4 ml. sont Bquivalentes a celles des semis fraichement extraits. Ces traitements offrent des alternatives efficaces et pratiques en faveur des repiquages printaniers tardifs. L'entreposage hivernal a -5OC affecte la survie des semis de I'epinette au Colorado et devient lethal pour les semis de pins sylvestres extraits a la mi-octobre,

Storage duration and temperature effect on the functional integrity of container and bare-root Pinus radiata D. Don stock-types

“…1D). Similarly, a 25-35% moisture content decrease in Colorado spruce and Scots pine seedlings stored as bare-root plants at 2°C for 10 days has been observed (Cram and Lindquist 1981). Moreover, the effect of storage depends on stock type, so that BR plants are more affected by storage conditions than PR ones (Fig.…”

Bare-root Planting Season Options

“…Yli-Vakkuri et al 1968), but in some circumstances -5°C can be lethal (cf. Cram and Lindquist 1981). Temperatures lower than -2OC would seem to offer only disadvantages.…”

“…Especially if it spans the freezing point, a difference in temperature of a few degrees can cause dramatic differences in subsequent performance of planting stock (cf. Cram andLindquist 1981, Mullin andLaupert 1981 ).…”