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Red to far-red ratio correction in plant growth chambers
Citation
Cummings, IG, Red to far-red ratio correction in plant growth chambers, Acta Horticulturae 907: Proceedings of the 6th International Symposium on Light in Horticulture, 15-19 November 2009, Tsukuba, Japan, pp. 145-149. ISSN 0567-7572 (2011) [Refereed Conference Paper]
Copyright Statement
Copyright 2011 International Society for Horticultural Science
Official URL: http://www.actahort.org/books/907/
Abstract
Unlike natural light, growth chamber light sources typically have a high ratio
of red to far-red (R:FR) light, hence incandescent lamps are commonly added to the
light mix to reduce R:FR. However, R:FR still remains well above the natural ratio
of 1 in the proportions commonly used in growth chambers, which for some species
may still relatively delay flowering and reduce length. Incandescent lamps also
produce a lot of heat, which in itself can be a major influence on plant growth, and
are also being phased out in many countries in favour of more energy efficient
sources. This study examined the influence of R:FR correction in growth chambers
by incandescent lamps or FR light emitting diodes (LEDs). Spectral scans to
1100 nm show the significant heat loading of incandescent relative to LEDs. Growth
studies using 4 species (pea, tomato, barley and arabidopsis) showed little influence
of ratio correction by either method on barley and tomato, while pea and
arabidopsis were only responsive to large reductions in R:FR. Temperature and
humidity measurements both increased at plant level with the use of incandescent,
but not with LEDs. This had little influence on the growth of barley and tomato, but
did influence pea and arabidopsis. The influence was less in barriered light loft
growth chambers. The results overall suggest that use of incandescent lamps has
little influence in the usual proportions provided in growth chambers, while higher
proportions can increase temperature and humidity at plant level. Much lower
R:FR is achievable through the use of FR LEDs without such influences.
Item Details
| Item Type: | Refereed Conference Paper |
|---|---|
| Keywords: | plant development, red, far red, artificial light, growth chambers, incandescent lamps, LEDs, R:FR |
| Research Division: | Biological Sciences |
| Research Group: | Plant Biology |
| Research Field: | Plant Physiology |
| Objective Division: | Plant Production and Plant Primary Products |
| Objective Group: | Environmentally Sustainable Plant Production |
| Objective Field: | Environmentally Sustainable Plant Production not elsewhere classified |
| UTAS Author: | Cummings, IG (Mr Ian Cummings) |
| ID Code: | 90087 |
| Year Published: | 2011 |
| Deposited By: | Research Division |
| Deposited On: | 2014-03-26 |
| Last Modified: | 2014-05-14 |
| Downloads: | 0 |
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