Canadian Forest Service Publications
Observations et mesures concernant la culture en serre de semis d'épinette noire en conteneurs. 1987. Gonzalez, A.; D'aoust, A.L. Service canadien des forêts, Région du Québec, Sainte-Foy (Québec). Rapport d'information LAU-X-79. 72 p.
Issued by: Laurentian Forestry Centre
Catalog ID: 14600
Series: Information Report (LFC - Québec)
Availability: PDF (download)
Although daily climatic conditions varied significantly in the greenhouse, they had little effect on the morphological parameters of black spruce seedlings. One of the most significant differences recorded was some periodic extreme temperatures. The quality of the seedlings produced was frequently related to the sum of growing degree-days for a particular season. Different watering and fertilizing regimes did not show any significant effect on the morphology nor the chemical composition of the seedlings. Successive use of 20-20-20 and 10-52-10 fertilizers, for a total of 260 mg/cell, gave satisfactory results. Nevertheless, the practitioner can work at ease around this figure. Each year, during three consecutive years, 25 000 containerized black spruce seedlings were grown in a greenhouse. Seedlings were kept in a greenhouse for sixteen weeks and under a shadehouse for three weeks for two growing periods. Climatic factors were recorded and samples were collected periodically for morphological and nutritional evaluation using substrate analysis throughout the growing periods.
Also available under the title:
Observations and measurements of containerized black spruce seedlings growing in a greenhouse (English)