August 2021 - 30

PRODUCTION
Roots, Shoots &
ENVIRONMENTALS
PART 3
Many environmental factors affect your plants.
Depending on your production style, you decide
which ones are worth manipulating.
BY CARL SILVERBERG
I
n the first two parts of this series, we
talked about the root zone and the shoot
zone. In part three, we're going to discuss
environmentals. While there is a push towards
complete control in the greenhouse, our
philosophy is that data should be used to help
the grower fit his or her particular style, not to
dictate how an operation should run.
" Instead of buying specific varieties, I can
manipulate the root and shoot zone and cultivate
the way I like, " is how one Western grower put
it. " This allows me to use a lot more varieties;
it creates new markets and new avenues. I
manipulate the environment and the nutrients,
and I create the plant I want instead of relying
on someone else and then hope that plant will
adapt to different conditions. If a plant is bred
for specific conditions and it doesn't get them, it
suffers more. "
So the question becomes, what are the
environmentals that affect plants? Well, as
you all know, there are a variety of factors, but
today we're just going to focus on greenhouse
materials, lighting and carbon dioxide.
A HOLISTIC APPROACH
Kurt Parbst is with Envirotech Cultivation
Solutions and his approach to CO2
usage
is holistic.
" How do we do a better job with fewer
resources? That's the mission, " he states. " It
30 AUGUST 2021 GPNMAG.COM
Marc van Iersel (right) in the University of Georgia greenhouse.
doesn't happen unless you give the plant the
right amount of light, the proper temperature
conditions, and CO2
- assuming that water,
nutrients, and everything else is in line. The idea
is at every stage of growth to bring these things
up to an economic level so that the plant is fully
expressing itself in a commercially viable way. "
Okay, so as part of the overall environmental
aspect what makes CO2
a unique component?
Parbst says, " You can get tremendous
increases in yields anywhere from 20 to 50%
by augmenting CO2
, but it has to be done in
line with your other environmentals. Cannabis
growers, for example, are pushing CO2
. But if

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August 2021

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