ISHS Acta Horticulturae 174: Symposium Greenhouse Climate and its Control
THE INFLUENCE OF LIGHT QUALITY ON PLANT GROWTH IN CONTROLLED ENVIRONMENT |
| Author: | A. Andersen |
| Abstract:
The relative efficiency of 12 fluorescent lamps used for growing tomato seedlings in a controlled environment chamber was investigated. Fresh wt, dry wt, leaf area and plant height was recorded and compared to the incident radiation flux. The highest yield of fresh wt, dry wt and leaf area was found under Philips TL 33 and TL 83, when compared on the basis of equal wattage input. TL 33 also produced the most compact plants expressed as mg dry wt per cm height. Fresh or dry wt production was not closely correlated to the measured incident radiation flux density, which indicate that light quality or specific energy distribution is an important factor, and the efficiency of the lamps to convert electrical power to visible radiation is not a reliable criteria for the selection of lamps for plant illumination. | |
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