Cuttings were taken at different levels in the crown of both flower-bearing and sexually immature 9-year-old black spruce seedlings (Piceamariana (Mill.) B.S.P.). We obtained satisfactory rooting success, despite the relatively old age of the trees. The rooting percentage of the cuttings taken from the lower third of the crown was significantly higher (p < 0.01) than that of the cuttings originating from the middle and top thirds of the crown (53%, 36%, and 29%, respectively). Cuttings from the upper portion of the crown showed persistent signs of advanced maturation, while those from the bottom of the crown regained an almost juvenile appearance after rooting. Surprisingly, the cuttings taken on flower-bearing trees rooted better (p < 0.10) than those taken on sexually immature trees (48% vs. 30%). Large and significant differences were also recorded between individuals of both groups. No significant interaction was found between sexual maturity and crown position of the cuttings for rooting percentage. The effects of maturation on the rate of rooting and the relevance of replacing grafting by rooting for certain purposes are discussed.
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