Articles
QUANTIFYING THE INFLUENCE OF HIGH-PRESSURE SODIUM LIGHTING ON SHOOT-TIP TEMPERATURE
Article number
418_10
Pages
85 – 92
Language
Abstract
Vinca (Catharanthus roseus L.) plants were placed in a growth chamber under high-pressure sodium (HPS) lamps to quantify the effect of supplemental lighting at 0, 50, 75, or 100 μmol m-2 s-1 photosynthetic photon flux (PPF) on shoot-tip temperatures.
PPF treatments were delivered at air temperatures of 15, 20, 25, and 30°C and at vapor-pressure deficits (VPD) from 0.5 to 3.0 kPa.
The temperature of plants receiving 50, 75, and 100 μmol m-2s-1 was 1.2, 1.5, and 1.7°C higher, respectively, than that of plants in the dark, regardless of VPD. Relative to air temperature, plant temperature decreased 1.2°C as the VPD increased from 0.5 to 3.0 kPa at each PPF level.
A polycarbonate/water filter was used to reduce the long-wave radiation incident on the plant canopy.
At 100 μmol m-2s-1, plants under the polycarbonate/water filter were 2.7°C cooler than those grown at the same PPF without the filter.
Supplemental lightning’s effect on plant temperature and developmental rates will be discussed.
PPF treatments were delivered at air temperatures of 15, 20, 25, and 30°C and at vapor-pressure deficits (VPD) from 0.5 to 3.0 kPa.
The temperature of plants receiving 50, 75, and 100 μmol m-2s-1 was 1.2, 1.5, and 1.7°C higher, respectively, than that of plants in the dark, regardless of VPD. Relative to air temperature, plant temperature decreased 1.2°C as the VPD increased from 0.5 to 3.0 kPa at each PPF level.
A polycarbonate/water filter was used to reduce the long-wave radiation incident on the plant canopy.
At 100 μmol m-2s-1, plants under the polycarbonate/water filter were 2.7°C cooler than those grown at the same PPF without the filter.
Supplemental lightning’s effect on plant temperature and developmental rates will be discussed.
Authors
James E. Faust, Royal D. Heins
Keywords
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