EFFECT OF NURSERY CULTURE ON MORPHOLOGICAL DEVELOPMENT OF WESTERN HEMLOCK SEEDLINGS DURING FIELD ESTABLISHMENT .2. SURVIVAL, SHOOT LENGTH COMPONENTS, AND NEEDLE LENGTH

Western hemlock (Tsuga heterophylla (Raf.) Sarg.) seedlings grown in t wo different container cavities that received four different dormancy induction treatments, short (SD) or long days (LD) in combination with moisture stress (D) or no stress (W) in the greenhouse, and lifted an d placed in cold storage (November, January, or March), were planted o n two adjacent coastal reforestation sites in British Columbia and mon itored for survival and morphological development. Survival was greate st in seedlings grown in the larger cavities in the greenhouse, in see dlings lifted in March, and in seedlings not treated to moisture stres s. Seedling shoots had more stem units on the southeast than the north west site, but the amount varied with nursery treatment. Seedlings fro m the LD treatments produced more stem units during free growth and la mmas growth than those from the SD treatment. Nevertheless, most shoot growth was predetermined in the buds during nursery culture, accounti ng for a minimum of 67% of the final number of stem units. Stem unit l ength (SUL) was longer in seedlings on the southeast site than on the northwest site for those treated to LD in the nursery. Seedlings treat ed to short days showed the reverse pattern (SDW) to this, or were una ffected by site (SDD). Shoots and needles were shortest for seedlings from the SDD treatment and for those lifted in November. Shoot growth was greatest for seedlings lifted in March and for those treated with LD, mainly owing to their longer SUL. Lammas growth was most frequent in seedlings from the smaller cavities, and in those from the November and March lifts.