Maximum Yield Australia/New Zealand March/April 2020 | Page 54
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The possibility of breeding new cultivars of tomatoes with
tolerance to continuous light could be an exciting development
for this hydroponic crop.
“FACTORS SUCH AS LIGHT
intensity, spectrum, and temperatures
all interact to determine the final
response to this technique.”
Conclusion
While low-level continuous light can give increases in
growth and productivity with some crops, under certain
conditions, it is not always a simple case of switching
the lights on permanently and hoping for the best result.
Some species such as tomatoes are particularly sensitive
to continuous light and suffer leaf injury and losses in
productivity, while factors such as light intensity, spectrum,
and temperatures all interact to determine the final
response to this technique. What is promising, however, is
the use of temperature variations under continuous light
to maximise carbohydrate metabolism and unloading
of sugars from the foliage into developing cells, thus
increasing the potential of light usage.
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There exists a genetic potential within many commonly
grown hydroponic species to breed varieties that are less
prone to damage under continuous light, while at the same
time be able to maximise the extra hours of photosynthesis
to result in increased growth rates and yields. For those
wanting to experiment with continuous light, choosing plants
that don’t require a certain day length to flower or prevent
flowering is the first step, followed by careful consideration
of the intensity of the light for the species chosen, and,
finally, maintaining a temperature difference within each
24-hour period that provides some cooler conditions to assist
with sugar unloading and carbohydrate metabolism.