Abstract
Abstract 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%.
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Claims 8
Claim · model-written summary
Daily CER varied considerably with solar radiation.
Verbatim
e0“The daily CER varied considerably from day to day owing to the large variation in solar radiation”
t0“Greenhouse Roses”
Claim · model-written summary
CER did not appear light saturated even on clear days.
Verbatim
e0“Light saturation of CER seemed not to be reached even on clear days”
t0“Greenhouse Roses”
Claim · model-written summary
Variable and constant light doses with similar PAP gave the same total CER.
Verbatim
e0“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”
t0“Greenhouse Roses”
Claim · model-written summary
At constant PPFD, CER rose rapidly in the first two hours and slightly thereafter.
Verbatim
e0“CER at constant PPFD increased rapidly during the first two hours of the photoperiod, followed by a slight increase during the subsequent hours”
t0“Greenhouse Roses”
Claim · model-written summary
CER declined slightly near the end of the photoperiod.
Verbatim
e0“CER slightly decreased towards the end of the photoperiod”
t0“Greenhouse Roses”
Claim · model-written summary
Raising CO2 significantly increased photoperiod CER by 32% on average.
Not reportedComparator
Verbatim
e0“Raising the CO2 concentration significantly increased CER during the entire photoperiod, and by 32% as a mean for the whole photoperiod”
t0“Greenhouse Roses”
Claim · model-written summary
Elevated CO2 decreased night respiration by 30%.
Not reportedComparator
Verbatim
e0“Elevated CO2 decreased the night respiration of the plants by 30%”
t0“Greenhouse Roses”
Claim · model-written summary
CO2 enrichment increased total light and dark period CER by 38%.
Not reportedComparator
Verbatim
e0“As a total of the light and dark period, CO2 enrichment increased CER by 38%”
t0“Greenhouse Roses”
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.