Maximum Yield Australia/New Zealand March/April 2020 | Page 49

Light Intensity
The amount of light intercepted by a crop is dependant not
only on the number of hours per day light is provided, but also
by the intensity. The amount of light received over a 24-hour
period can be calculated as the daily light integral (DLI),
which is a combination of intensity and duration. This is a
much more meaningful way of measuring the light received
by a plant than just a spot reading of intensity. Plants grown
under longer photoperiods (18 hours of light compared to
12 hours, for example), can be provided with a lower light
intensity, however, the increased day length means they will
receive the same overall light total as those under the shorter
day length. This means plants grown under continuous light
can only use so much light within a 24-hour period before
they become completely light saturated at a high DLI, thus
continuous lighting regimes typically use lower output lamps.
Low-level continuous lighting is currently used for some crops
such as seedlings, lettuce, and leafy vegetables, however, the
most potential seems to exist with those crops which require
a high overall day light level and have a strong demand for
assimilate to maximise fruit growth.
Continuous Light and Plant Injury
Continuous light has been reported to
cause leaf and crop injury and is somewhat
species dependant. Tomatoes are particularly
sensitive and cultivated tomato varieties have
been widely reported to develop leaf injury
when grown in continuous light.
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Low-intensity continuous light is often used for
seedlings and small salad greens.
“EVEN IF SUFFICIENT LIGHT IS PROVIDED,
the build-up of assimilate in the leaf and subsequent
slowing of photosynthesis means that no increases in yield
and productivity will occur even under continuous light.”
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Maximum Yield
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