June 2022 - 25

LIGHTING
most effective from the plant's perspective, but it can create an unpleasant
environment to work in when it is the primary light source. The purple light
might be unsettling for people who aren't used to that light. "
WHAT'S THE RIGHT AMOUNT OF SUPPLEMENTAL LIGHT?
When using supplemental light in a greenhouse, Runkle says the
intensity will depend on the crops being grown and the amount of light
coming from the sun.
" A target for a lot of crops will be to deliver at least 8 to 10 moles of
light per day, " he says. " If a crop is only receiving 4 moles per day on
average during the winter that will mean having to deliver an additional
4 moles by supplemental lighting.
" Economically, most supplemental lighting is used in propagation
because growers can space a lot of plants at a high density, " he adds.
" Once the plants are spaced out, lighting cost on a per-crop basis begins
to increase. "
Runkle advises growers that while adding supplemental light can be
beneficial, too much light can also have an impact on plants.
" One of the consequences we have observed within the last two years
of growers installing LED lighting is delivering too much light to the
plants, " he says.
The seedlings of most
crops can tolerate whatever
amount of light they might
receive from a supplemental
light source. If plants are given
80 to 100 micromoles from
supplemental lighting that is
normally fine for seedlings. However,
if unrooted cuttings are placed under
LEDs at a fairly high intensity, there can
be some bleaching or discoloration of
the leaves.
" During the first seven to 10 days
of propagation too much
light can
be too much
of a good thing, "
Runkle says. " Once
plants have developed
the initial roots, more light
can be used to promote
faster rooting. "
THE BENEFITS OF
SUPPLEMENTAL LIGHTING
A higher light intensity provided by
supplemental lighting can decrease
the propagation time, which can
also decrease the final crop
production time.
" This is one of the major
reasons growers use
supplemental lighting
in the greenhouse, "
Runkle says. " The
time a production
schedule can
be shortened
Jeff Stoven, propagation
manager at Bailey Nurseries,
with Acer liners inside one of the
company's propagation pods.
Jeff Stoven with Pyrus liners inside one of Bailey's controlled environment
propagation pods.
Bailey Nurseries has constructed two indoor propagation pods from 40-foot
shipping cargo containers to acclimatize unrooted tissue culture woody
ornamental cuttings.
GREENHOUSE PRODUCT NEWS 25

June 2022

Table of Contents for the Digital Edition of June 2022

June 2022 - 1
June 2022 - 2
June 2022 - 3
June 2022 - 4
June 2022 - 5
June 2022 - 6
June 2022 - 7
June 2022 - 8
June 2022 - 9
June 2022 - 10
June 2022 - 11
June 2022 - 12
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June 2022 - 14
June 2022 - 15
June 2022 - 16
June 2022 - 17
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June 2022 - 25
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