July 2024 - 7

LIGHTING RESEARCH
For example, on a cold winter day, plants might use
supplemental light less efficiently in the morning than in
the afternoon, even under the same sunlight levels. This
is because low temperatures in the morning might stress
plants, making them unable to utilize light efficiently.
In this case, we would like to provide more
supplemental lighting in the afternoon rather than in the
morning. Conversely, hot temperatures in the afternoon
on a hot summer day will reduce the light use efficiency.
Even though the discrepancies may vary depending
on species and growth stage, it is still worthwhile to take
into account the light use efficiency when controlling
supplemental lighting.
Then how can we measure the light use efficiency?
CHLOROPHYLL FLUORESCENCE
For all plants, a small fraction of absorbed light is
re-emitted from chlorophyll molecules, which is called
chlorophyll fluorescence.
Chlorophyll fluorescence can be a good option
that represents photosynthetic light use efficiency in
scientific settings. We can measure a plant's stress
status and photosynthetic capacity using the chlorophyll
fluorescence parameters. The electron transport rate
(ETR) and quantum yield of photosystem II (ΦPSII)
represent photosynthesis speed and photosynthesis
efficiency, respectively. Those physiological responses
can be monitored in real-time by using a fluorometer.
CHLOROPHYLL FLUORESCENCE-BASED
BIOFEEDBACK SYSTEM
A novel supplemental light control strategy has been
developed utilizing chlorophyll fluorescence parameters.
A chlorophyll fluorescence-based biofeedback system,
also known as the biofeedback system, adjusts LED light
levels based on a target value of either ETR or ΦPSII.
For example, if you want to achieve a certain amount
of photosynthesis speed of your crop, you can use this
biofeedback system to maintain specific ETR (e.g., 80
μmol·m-2
·s-1). Or, if you want to provide LED light only
when your crops can utilize it efficiently, ΦPSII can be
used as a target parameter. In other words, by using this
innovative biofeedback system, plants can decide their
light conditions depending on their physiological status
instead of providing just a fixed amount of light level. Not
only sunlight levels but also other environmental factors,
Graphs A and C show how the biofeedback system maintained a wide range of target electron transport rate (ETR) and quantum yield
of photosystem II (ΦPSII), respectively, over a single day. Graphs B and D represent how the biofeedback system adjusted the LED
light levels based on target ETR and ΦPSII, respectively. All data courtesy of Suyun Nam.
GREENHOUSE PRODUCT NEWS
7

July 2024

Table of Contents for the Digital Edition of July 2024

Table of Contents
Editor's Report | Summertime decisions
Lighting Research | Supplemental lighting strategies
Technology | Transforming with automation
CAST 2024 | Remarkable releases for 2025
CEA | The importance of canopy ventilation
Climate Control | Enhancing greenhouse management
Special Advertising Section | Grower's Guide: Professional Growing Media and Biologicals
Variety Information | New take on smooth hydrangeas
Big Grower | Hydroponic farming
Product Showcase
Plant Health | Setting ground rules
Forty Under 40 Perspectives | Turning a lifelong education into a business
Culture Report | Grama grass
Technically Speaking | Why crops don't flower (on time)
Product Marketplace
Industry News/Events
Classifieds/Ad Index
July 2024 - 1
July 2024 - 2
July 2024 - Table of Contents
July 2024 - Editor's Report | Summertime decisions
July 2024 - 5
July 2024 - Lighting Research | Supplemental lighting strategies
July 2024 - 7
July 2024 - 8
July 2024 - 9
July 2024 - 10
July 2024 - 11
July 2024 - Technology | Transforming with automation
July 2024 - 13
July 2024 - 14
July 2024 - 15
July 2024 - CAST 2024 | Remarkable releases for 2025
July 2024 - 17
July 2024 - 18
July 2024 - 19
July 2024 - 20
July 2024 - 21
July 2024 - 22
July 2024 - 23
July 2024 - 24
July 2024 - 25
July 2024 - 26
July 2024 - 27
July 2024 - CEA | The importance of canopy ventilation
July 2024 - 29
July 2024 - 30
July 2024 - 31
July 2024 - 32
July 2024 - 33
July 2024 - Climate Control | Enhancing greenhouse management
July 2024 - Special Advertising Section | Grower's Guide: Professional Growing Media and Biologicals
July 2024 - A2
July 2024 - A3
July 2024 - A4
July 2024 - A5
July 2024 - A6
July 2024 - A7
July 2024 - A8
July 2024 - A9
July 2024 - A10
July 2024 - A11
July 2024 - A12
July 2024 - A13
July 2024 - A14
July 2024 - A15
July 2024 - A16
July 2024 - Variety Information | New take on smooth hydrangeas
July 2024 - 36
July 2024 - 37
July 2024 - 38
July 2024 - 39
July 2024 - 40
July 2024 - Big Grower | Hydroponic farming
July 2024 - 42
July 2024 - 43
July 2024 - 44
July 2024 - 45
July 2024 - 46
July 2024 - Product Showcase
July 2024 - Plant Health | Setting ground rules
July 2024 - 49
July 2024 - 50
July 2024 - 51
July 2024 - Forty Under 40 Perspectives | Turning a lifelong education into a business
July 2024 - 53
July 2024 - Culture Report | Grama grass
July 2024 - 55
July 2024 - 56
July 2024 - 57
July 2024 - Technically Speaking | Why crops don't flower (on time)
July 2024 - 59
July 2024 - Product Marketplace
July 2024 - 61
July 2024 - 62
July 2024 - 63
July 2024 - 64
July 2024 - Industry News/Events
July 2024 - Classifieds/Ad Index
July 2024 - 67
July 2024 - 68
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https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2022
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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
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https://www.nxtbook.com/greatamericanmediaservices/GPN/hempguide-2022
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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
https://www.nxtbook.com/greatamericanmediaservices/GPN/june-2021
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
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https://www.nxtbook.com/greatamericanmediaservices/GPN/november-2020
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https://www.nxtbook.com/greatamericanmediaservices/GPN/september-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/august-2020
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https://www.nxtbook.com/greatamericanmediaservices/GPN/june-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/may-2020
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