May 2024 - 61

TECHNICALLY SPEAKING
humidity, especially when a greenhouse is full of plants.
High humidity decreases water and nutrient uptake by
plants, which can slow down growth and can create more
favorable conditions for pathogens.
Day/night temperature regulates crop height. For most
crops, a warmer day than night temperature (positive DIF,
or +DIF) promotes stem extension and subsequently crop
height. The opposite is true too; plants are more compact
when the day is cooler than the night (negative DIF, or
-DIF). There are trade-offs to a -DIF for compact growth
as energy costs for heating are typically higher and other
quality attributes may be marginally lower. Regardless,
when choosing greenhouse temperature settings, consider
how the difference between the day and night temperature
will impact crop height.
Successful delivery of temperature setpoints. There
are many factors that influence how well the greenhouse
temperature setpoint is achieved, especially when the
outside temperature is high. Factors that can hamper
attaining your setpoint in an energy efficient manner include:
* Gaps or tears in the glazing or sidewalls
* Doors left open to the outside or growing area at a
different temperature
* Side and/or roof vents do not completely close or
adequately open
* Exhaust fans are not working properly
* Evaporative pads are not fully functional
* Fog or fine-mist nozzles are clogged
* Air temperature sensors are not aspirated or
sufficiently close to the crop
* There is an inadequate dead band between
when heating turns off and ventilation begins,
and vice versa.
Considering the importance of temperature on plant
growth, flowering time and energy consumption, it's critical
that setpoints are chosen based on a variety of factors
including those mentioned here. In addition, greenhouses
need to be sufficiently maintained so that desired setpoints
are achieved as closely as possible.
For more on greenhouse temperature management,
click on the " Greenhouse temperature management " tab
at canr.msu.edu/floriculture/resources.
Erik Runkle is professor and floriculture Extension specialist in
the Department of Horticulture at Michigan State University.
He can be reached by email at runkleer@msu.edu.
small details
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GREENHOUSE PRODUCT NEWS 61

http://canr.msu.edu/floriculture/resources https://www.sormac-inc.com/machines/automatic-recipe-conveyor/

May 2024

Table of Contents for the Digital Edition of May 2024

Table of Contents
Editor's Report | Meet the next 40!
Automation | Managing what you measure
Technology Innovations | Illuminating the future: Dynamic LED technology
Forty Under 40 | The Class of 2024
Houseplants
Variety Information | A bevy of blooms
Big Grower | Red Sun Farms
Big Grower | Product Showcase
Technically Speaking | Controlling greenhouse temperature for successful production
Culture Report | Garden Gems Cercis Collection
SGAFT | Technology ladders + math = actionable education
AmericanHort | Cultivate your success
Product Marketplace
Classifieds/Ad Index
May 2024 - 1A
May 2024 - 1B
May 2024 - 1C
May 2024 - 1D
May 2024 - 1
May 2024 - 2
May 2024 - Table of Contents
May 2024 - Editor's Report | Meet the next 40!
May 2024 - 5
May 2024 - 6
May 2024 - 7
May 2024 - Automation | Managing what you measure
May 2024 - 9
May 2024 - 10
May 2024 - 11
May 2024 - 12
May 2024 - 13
May 2024 - Technology Innovations | Illuminating the future: Dynamic LED technology
May 2024 - 15
May 2024 - 16
May 2024 - 17
May 2024 - Forty Under 40 | The Class of 2024
May 2024 - 19
May 2024 - 20
May 2024 - 21
May 2024 - 22
May 2024 - 23
May 2024 - 24
May 2024 - 25
May 2024 - 26
May 2024 - 27
May 2024 - 28
May 2024 - 29
May 2024 - 30
May 2024 - 31
May 2024 - 32
May 2024 - 33
May 2024 - 34
May 2024 - 35
May 2024 - 36
May 2024 - 37
May 2024 - 38
May 2024 - 39
May 2024 - 40
May 2024 - 41
May 2024 - 42
May 2024 - 43
May 2024 - Houseplants
May 2024 - 45
May 2024 - 46
May 2024 - 47
May 2024 - Variety Information | A bevy of blooms
May 2024 - 49
May 2024 - 50
May 2024 - 51
May 2024 - 52
May 2024 - 53
May 2024 - Big Grower | Red Sun Farms
May 2024 - 55
May 2024 - 56
May 2024 - 57
May 2024 - 58
May 2024 - Big Grower | Product Showcase
May 2024 - Technically Speaking | Controlling greenhouse temperature for successful production
May 2024 - 61
May 2024 - Culture Report | Garden Gems Cercis Collection
May 2024 - 63
May 2024 - 64
May 2024 - 65
May 2024 - SGAFT | Technology ladders + math = actionable education
May 2024 - 67
May 2024 - AmericanHort | Cultivate your success
May 2024 - 69
May 2024 - Product Marketplace
May 2024 - 71
May 2024 - 72
May 2024 - 73
May 2024 - Classifieds/Ad Index
May 2024 - 75
May 2024 - 76
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https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-january-2023
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https://www.nxtbook.com/greatamericanmediaservices/GPN/gpn-new-varieties-digital-guide-2023
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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
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
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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
https://www.nxtbook.com/greatamericanmediaservices/GPN/april-2021
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
https://www.nxtbook.com/greatamericanmediaservices/GPN/californiaspringtrials-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-march-2020
https://www.nxtbook.com/greatamericanmediaservices/GPN/march-2020
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https://www.nxtbook.com/greatamericanmediaservices/GPN/big-grower-july-2019
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https://www.nxtbook.com/greatamericanmediaservices/GPN/june-2019
https://www.nxtbook.com/greatamericanmediaservices/GPN/may-2019
https://www.nxtbook.com/greatamericanmediaservices/GPN/april-2019
https://www.nxtbook.com/greatamericanmediaservices/GPN/californiaspringtrials-2019
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