July 2019 - 32

PRODUCTION
Indoor Grow Rooms Can Improve the Success of
Young Plant Propagation
Indoor grow rooms equipped with LEDs can produce consistent young transplants, making
it easier for growers to plan their planting schedules and delivery orders.
Consistency is the name of the game with indoor young plant production,
ensuring plants are ready for transplanting or shipping on schedule.
BY DAVID KUACK
A
lthough light is a critical factor in the propagation of plants
produced from seed and vegetative cuttings, it is only one of the
components of propagation.
" Initially the light conditions are important, including light quality
and light intensity, along with temperature and humidity, " says Ricardo
Hernandez, horticulture professor at North Carolina State University.
" Initially these are the most important factors. As plants start to grow
and get larger, carbon dioxide and good airflow are important. We are
investigating all of the components that optimize young plant production
in indoor grow rooms or growth chambers. "
Hernandez is studying the impact LEDs have on the propagation of seed
and vegetative starter plants.
" There are different levels for justifying the use of LEDs, " he says. " The
No. 1 reason is if a grower has a high-value cutting or seed. The higher the
value of the crop the easier it is to justify installing and operating LEDs.
Cuttings may be difficult to root or seed may be difficult to germinate
because the propagation environment is not optimum.
" For some plants the seed may cost $1 per seed. That is high-value
32 JULY 2019 GPNMAG.COM
All photos courtesy of Ricardo Hernandez, North Carolina State University
seed so a grower wants the highest percent germination and the highest
percent conversion of those plants. If the seed is inexpensive a grower
may choose to simply over seed. With inexpensive seed, the grower can
overcompensate for less than ideal propagation conditions. "
WHY INDOOR PROPAGATION?
Ricardo says growers are able to maintain better control in an indoor
production facility than in a greenhouse.
" In a greenhouse the light is not always uniform, " he says. " There could
be a week of cloudy days. If the plants are being propagated during the
winter the day length is not very long. Even though there can be a good
amount of light in a greenhouse, it's not uniform and the amount of light
or daily light integral, could be below what is needed. On some days there
may be more than enough sunlight to propagate the plants. But on other
days the light levels may be too low.
" These changing light levels can create uncertainty in regards to plant
growth. There are experienced growers who understand the changes in
light levels and can predict the effect it can have on their plants. They

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July 2019

Table of Contents for the Digital Edition of July 2019

July 2019 - 1
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