Influence de l'irradiation sur la croissance de plants d'épinette noire en contenants placés dans deux enceintes de culture

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Abstract
Experiments with container-grown seedling in a greenhouse showed a large variation of plant material. Studies were initiated to identify whether irradiation (cumulative radiation) was responsible for the variation in growth observed. From parallel studies, between greenhouse and growth cabinet, it appears that a superior accumulation of dry matter and a larger stem diameter are related to the cumulative radiation during the growth period. However, the length of seedlings is not as sensitive to this light factor. Another study in a growth chamber, where all the climatic factors were identical except for the photon flux which was reduced in half of the growing area, shows the significant effect of this factor of light on the growth of Piceamariana (Mill.) B.S.P. seedlings. An overall evaluation of the results also indicates that the growth cabinet with its controlled environment did not reduce the total variation of the seedlings and therefore a preselection of black spruce material could improve the quality of a production.

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