CO2 only during flower? What should I do?

xIPhobiaIx

xIPhobiaIx

Active Member
Hello,

If a plant only has normal CO2 (300-400ppm) during every stage up until flowering will additional CO2 (1500ppm) during the flowering stage even be worth it?
Will it just kill the plant, not have any affect, or will it in fact still be worth it?

Thank you!
 
kingromano

kingromano

Well-Known Member
yes that's how it must be done
plants dont need co2 during rooting.. nor veg
you can enrich during veg but keep in mind plant acclimate to co2, meaning they build a tolerance over time. gassing too early in veg will waste your boost when the plants need it more
plants need to have flowers/fruits to consume higher levels of co2

ideally you want to increase enrichment progressivly, dont go from 450 to 1500ppm overnight
they need to build leaves in a different pattern (stomatas concentrations on the leaves) to grow in co2 enrichment environnement

you can use around 600 for stretch then increase to 800 when flowers start to appear. continue to increase until 1200ppm for flowering(1500 is pretty high you want high illumination to allow plant to eat at those high levels)

keep your eyes open for vpd stress signs (common under co2) when you start to introduce it
you can see plant clawing leaves meaning their stomatas are too much closed
in this case reduce co2/ increase humidity
 
xIPhobiaIx

xIPhobiaIx

Active Member
kingromano said:
yes that's how it must be done
plants dont need co2 during rooting.. nor veg
you can enrich during veg but keep in mind plant acclimate to co2, meaning they build a tolerance over time. gassing too early in veg will waste your boost when the plants need it more
plants need to have flowers/fruits to consume higher levels of co2

ideally you want to increase enrichment progressivly, dont go from 450 to 1500ppm overnight
they need to build leaves in a different pattern (stomatas concentrations on the leaves) to grow in co2 enrichment environnement

you can use around 600 for stretch then increase to 800 when flowers start to appear. continue to increase until 1200ppm for flowering(1500 is pretty high you want high illumination to allow plant to eat at those high levels)

keep your eyes open for vpd stress signs (common under co2) when you start to introduce it
you can see plant clawing leaves meaning their stomatas are too much closed
in this case reduce co2/ increase humidity
Click to expand...
So just keep it normal range until switching to flower than gradually climb in ppm? I have 6k (6 x 1k watt Gavitas) lighting in a 25x10x9 room completely sealed (spray foam, r15 fiberglass, vapor barrier, poly foam board, panda film)... is this enough lighting and reflection for 1500?

Also, I have a 190 pint dehu and a 3 ton mini split with 8 x 18 inch hurricane fans.... would i use these to affect VPD (still have to research vapor pressure).

Also, thank you for the great response. Question sat all day and glad I got a good answer. I luv this forum but not everyone is always helpful so thanks again. Just not trying to mess up to bad on how I approach and go about this.
 
kingromano

kingromano

Well-Known Member
yes gradually increase the ppm, try to match the ppm with the light intensity

looks like you have strong light setup, the best is to get a luxmeter (or a more expensive ppfd meter, not really necessary) to measure the light intensity at canopy

the dehu will be useful during light out to keep humidity in range
try to keep a vpd* of 0.8 in veg, around 1.0 during stretch and 1.2-1.5 during flowering
 
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xIPhobiaIx

xIPhobiaIx

Active Member
kingromano said:
yes gradually increase the ppm, try to match the ppm with the light intensity

looks like you have strong light setup, the best is to get a luxmeter (or a more expensive ppfd meter, not really necessary) to measure the light intensity at canopy

the dehu will be useful during light out to keep humidity in range
try to keep a vpd* of 0.8 in veg, around 1.0 during stretch and 1.2-1.5 during flowering
Click to expand...
Do you stop CO2 2 weeks before harvest?
 
kingromano

kingromano

Well-Known Member
no
but you will reduce it compared to week 4/5. you must match the nutrients curve with the co2 curve
nutrients levels increase between week 1 to 6 of flowering, then it start to decrease slowly as bud enter in maturation phase
same for co2
if you peak at 1500ppm be around 800/900ppm the harvest day
 
xIPhobiaIx

xIPhobiaIx

Active Member
How much in your experience does CO2 enhancement if done right like you laid out ACTUALLY increase yield? 5% 20% Higher?
 
xIPhobiaIx

xIPhobiaIx

Active Member
kingromano said:
and above all it gives your perfect control on your room (temp/rh/co2)
you're no more dependant of outdoor weather
Click to expand...
So 20% and in less time so technically more harvests as well which is even more overall yield in a year.

How much extra cost in your electricity do you think comes from the dehu, co2, mini split ac, etc vs just running in and out exhaust fans?
 
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