Hello and thank you for your time
Does CO2 matter if under 1200 ppfd, or is it that at 1200 you Need to add CO2? Thank you again.
A plant must have 1,200+ PPFD to utilize the extra CO2.
You never “need” to add CO2, but there are diminishing returns on high PPFD at above 1,200 PPFD when CO2 is not used.
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Thank you