February 2025 - 12

CEA
Regulating crops in
A controlled space
BY HEATHER MACHOVINA
R
oberto Lopez from Michigan State University recently
joined me for a deep dive into harnessing the full
potential of PGRs in CEA production. In GPN's
2024 webinar, Lopez provided research-backed, practical
techniques for enhancing rooting, managing plant growth
with microdrenches and ensuring uniform ethephon spray
effects in the greenhouse.
Rooting hormones are commonly used in the industry
for plants that are difficult to root, slow to root or those
that have issues during transportation, Lopez said.
Products labeled with hormones including IAA, IBA,
AIBA and NAA help with cell elongation and adventitious
root formation, increasing overall rooting percentage and
uniformity, reducing crop finishing time and improving root
health, he said.
Let's get into more about what is known about PGRs and
the new MSU research for better growth control outcomes
with this summary from Lopez' educational webinar with GPN.
Efficiency, results drive PGR usage
and application method
METHOD MATTERS
The most familiar method of using rooting hormones
is basal dip applications in liquid or powder form. This
becomes labor intensive because every cutting has to be
treated before sticking. There is a greater risk of spreading
disease because many cuttings are touching the same
rooting hormone powder or liquid.
Foliar
Spray drenches (or sprenches) and foliar sprays with
PGRs is a newer method growers are increasingly using
in the greenhouse. This method is quick and is less likely
to spread diseases. A coarse spray is applied to cuttings
after they are stuck and spend 24 hours under mist. Plants
are turgid now, so the spray can effectively run from the
leaves down the stem and rest in the substrate at the base
of the cuttings.
Not all rooting hormones are labeled for this type of
I invite you to watch and
listen to the full discussion
from Roberto Lopez in
GPN's webinar " Getting
the Most out of PGRs and
New PGR Combos with
Great Promise. "
sprench application. If you use the incorrect form, it may
cause phytotoxicity, so a potassium salt formulation of IBA
or water-soluble formulations, such as KIBA, are less likely
to cause foliar damage.
Previous research involved the foliar spray applications
of common PGR products at different rates and various
daily light integrals (DLI). Optimal rates for the most roots
were noticed depending on PGR rate applied and crop
type, and increasing DLI (i.e., from 12 moles to 16 moles)
at the same PGR rates caused rooting to increase more.
Overall, foliar sprays are as effective or more effective
than basal dips at promoting rooting in difficult-to-root
12 FEBRUARY 2025 GPNMAG.COM

https://gpnmag.com/edwebinar/getting-the-most-out-of-pgrs-and-new-pgr-combos-with-great-promise/ http://www.GPNMAG.COM

February 2025

Table of Contents for the Digital Edition of February 2025

Table of Contents
Editor's Report
2025 California Spring Trials | Turn over a new leaf
CEA | Regulating crops in a controlled space
Grower Profile | North Carolina Farms
Variety Information | Poinsettia Variety Day 2024
Plant Health | Poinsettia protection
Technology | Taking control
Dr. Bugs | Life cycles of insect and mite pests
Technically Speaking | Getting the most out of energy and shade curtains
Culture Report | Heliopsis 'Burning Hearts'
Forty Under 40 Perspectives | A day in the life of plant protection
Product Marketplace
Classifieds/Ad Index
February 2025 - 1
February 2025 - 2
February 2025 - Table of Contents
February 2025 - Editor's Report
February 2025 - 5
February 2025 - 6
February 2025 - 7
February 2025 - 2025 California Spring Trials | Turn over a new leaf
February 2025 - 9
February 2025 - 10
February 2025 - 11
February 2025 - CEA | Regulating crops in a controlled space
February 2025 - 13
February 2025 - 14
February 2025 - 15
February 2025 - Grower Profile | North Carolina Farms
February 2025 - 17
February 2025 - 18
February 2025 - 19
February 2025 - 20
February 2025 - 21
February 2025 - 22
February 2025 - 23
February 2025 - Variety Information | Poinsettia Variety Day 2024
February 2025 - 25
February 2025 - 26
February 2025 - 27
February 2025 - 28
February 2025 - 29
February 2025 - Plant Health | Poinsettia protection
February 2025 - 31
February 2025 - 32
February 2025 - 33
February 2025 - Technology | Taking control
February 2025 - 35
February 2025 - 36
February 2025 - 37
February 2025 - Dr. Bugs | Life cycles of insect and mite pests
February 2025 - 39
February 2025 - Technically Speaking | Getting the most out of energy and shade curtains
February 2025 - 41
February 2025 - Culture Report | Heliopsis 'Burning Hearts'
February 2025 - 43
February 2025 - Forty Under 40 Perspectives | A day in the life of plant protection
February 2025 - 45
February 2025 - Product Marketplace
February 2025 - 47
February 2025 - 48
February 2025 - 49
February 2025 - Classifieds/Ad Index
February 2025 - 51
February 2025 - 52
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https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-july-2023
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https://www.nxtbook.com/greatamericanmediaservices/GPN/april-2023
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https://www.nxtbook.com/greatamericanmediaservices/GPN/2023-guide-to-hemp-production
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https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-january-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/january-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/2023-guide-to-cannabis-production
https://www.nxtbook.com/greatamericanmediaservices/GPN/november-december-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-october-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/october-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/gpn-new-varieties-digital-guide-2023
https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/august-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-july-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/july-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/june-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/may-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-april-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/april-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/march-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/february-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/cannabisguide-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/hempguide-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/newvarieties-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-january-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/january-2022
https://www.nxtbook.com/greatamericanmediaservices/GPN/december-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-november-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/november-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/october-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-september-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/august-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-july-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/july-2021
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https://www.nxtbook.com/greatamericanmediaservices/GPN/may-2021
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https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-march-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/march-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/february-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/cannabisguide-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/hempguide-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/newvarieties-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-january-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/january-2021
https://www.nxtbook.com/greatamericanmediaservices/GPN/december-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-november-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/november-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/october-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-september-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/august-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-july-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/july-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/june-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/may-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/april-2020
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