August 2021 - 26

RESEARCH
Consider the
PHOTOSYNTHETIC
BENEFITS
of Far-Red
Radiation
How can far-red radiation improve growth and light capture of lettuce/basil seedlings?
BY NATHAN EYLANDS AND NEIL MATTSON
A
bumper crop starts with
great seedlings. As a
grower, it makes sense
to supply supplemental lighting
to the propagation table.
Plants are densely spaced at
this time so the money you
spend on lighting will impact a
maximum number of individual
plants. Additionally, providing
supplemental light facilitates
a consistent transplanting
schedule during times of
the year when there is not
enough natural light. Overall,
starting with large, highquality
seedlings can go a long
way toward ensuring a good
harvest size.
Traditionally, horticultural
lights were chosen based on
their light output in terms
of photosynthetically active
radiation (PAR), that is
wavelengths of light from 400
26 AUGUST 2021 GPNMAG.COM
300
400
500
600
WAVELENGTH (NM)
700
800
900
300
400
500
600
700
WAVELENGTH (NM)
Figure 1. Spectral distributions of seedling lighting treatments. Far-red LED peak wavelength was 736 nm.
(All figures: Nathan Eylands)
to 700 nm (i.e., visible light from
blue to red). Recently, however,
researchers have concluded that
far-red photons are required
alongside PAR for efficient
photosynthesis. Far-red is also
important for crop growth including
leaf expansion, stem elongation,
and flowering.
800
900
0.0
RELATIVE INTENSITY
0.5
1.0
1.5 0.0
RELATIVE INTENSITY
0.5
1.0
1.5

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August 2021

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