EFFECTS OF CARBON DIOXIDE ENRICHMENT ON BUD FORMATION AND GROWTH OF CONIFEROUS SEEDLINGS.

ISHS Acta Horticulturae 268: IV International Symposium on CO2 in Protected Cultivation

**EFFECTS OF CARBON DIOXIDE ENRICHMENT ON BUD FORMATION AND GROWTH OF CONIFEROUS SEEDLINGS. - REFEREED PAPER -**

Authors:

E. Troeng, L. Ackzell

Abstract:
First-year seedlings of Pinus sylvestris, Pinus contorta and Picea abies were exposed to elevated (900 ppm or 1800 ppm) or ambient atmospheric carbon dioxide levels before or during budset.

Total seedling biomass increased at high carbon dioxide concentrations, root dry weight increasing more than shoot dry weight. Formation of needle primordia in the bud was not influenced by carbon dioxide enrichment. Pinus contorta showed a high percentage Lammas growth when exposed to high carbon dioxide concentrations.

For Picea abies, nutrient supply, temperature regimes and winter hardening were also studied in relation to carbon dioxide supply during bud formation. The number of needle primordia formed was strongly influenced by air temperature. Lack of nutrients during bud formation had a slightly negative effect on frost hardiness.

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