EFFECTS OF DIFFERENT CO₂ ENRICHMENT PROGRAMS DURING THE DAY ON PRODUCTION OF CUT ROSES

The effects of different CO₂ enrichment programs (morning CO₂ – from 8am to 12:00, afternoon CO₂ – 13:00 to 17:00, or day time CO₂ – from 8:00 to 17:00) on cut-flower production of Rosa hybrida ‘Escimo’, ‘Black Beauty’ and ‘Dream’ and leaf photosynthesis were investigated.
All CO₂ enrichment (1000±200 µL•L^-1) programs enhanced cut-flower yield and quality, however, the yield of different cultivars during different CO₂ programs was variable.
Cut flower yield of ‘Escimo’ and ‘Black Beauty’ grown during day CO₂ enrichment was highest with increases of 77% and 44% over the plants grown during ambient CO₂. The increase of cut rose yield during morning CO₂ enrichment or afternoon CO₂ enrichment was 41.5% and 28.4%, respectively, for ‘Escimo’ and 18.2% and 19.5%, respectively, for ‘Black Beauty’. Cut flower yield of ‘Dream’ grown with morning CO₂ enrichment was highest with an increase of 115.9% over the control; the average cut stem length of cut shoots was also longer.
The net leaf photosynthetic rate (Pn) of roses grown under every CO₂ enrichment program for 40 days was higher than control when Pn was measured at high CO₂ level (1050 µL·L^-1), Nevertheless, there was no significant difference between each CO₂ program and the control when Pn measured at ambient CO₂. Leaf Pn of rose grown under day CO₂ enrichment for 70 days was lower significantly than that grown under ambient CO₂ and other CO₂ program when measured at ambient CO₂ level, however, was still higher than the control when measured at high CO₂ level.
The leaf Pn of rose plants grown during morning CO₂ or afternoon CO₂ enrichment for 70 days was still higher than the control.

XXVII International Horticultural Congress – IHC2006: International Symposium on Ornamentals, Now!

H. Pan, Q. Zhang, Q. Liu, S. Liang, H. Kang

Rosa hybrida, cut-flower yield, quality, photosynthesis

https://doi.org/10.17660/ActaHortic.2008.766.5