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| Titel: |
Diurnal Carbon Dioxide Exchange Rates of Greenhouse Roses under Artificial Light as Compared with Daylight Conditions in Summer |
| Auteur: |
Mortensen, Leiv M. |
| Verschenen in: |
Acta agriculturae Scandinavica. Section B, Soil and plant science |
| Paginering: | Jaargang 45 (1995) nr. 2 pagina's 148-152 |
| Jaar: |
1995-06-01 |
| Inhoud: |
Carbon dioxide exchange rates (CER) of greenhouse roses (cut flowers) were measured under daylight conditions in a greenhouse in July, and under artificial light only (300 μmol m-2 s-1 PPFD in 18 h day-1) at two CO2 concentrations (350 and 700 μmol mol-1). The daily CER varied considerably from day to day owing to the large variation in solar radiation. Light saturation of CER seemed not to be reached even on clear days, and a light dose (PAP = number of photosynthetic active photons) produced by variable light over one week in summer gave the same total CER as a similar PAP produced by a constant PPFD. CER at constant PPFD increased rapidly during the first two hours of the photoperiod, followed by a slight increase during the subsequent hours, before CER slightly decreased towards the end of the photoperiod. Raising the CO2 concentration significantly increased CER during the entire photoperiod, and by 32% as a mean for the whole photoperiod. Elevated CO2 decreased the night respiration of the plants by 30%. As a total of the light and dark period, CO2 enrichment increased CER by 38%. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 3 van 9 gevonden artikelen
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