RE: Adding CO2 into the grow tent
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Have you thought of taking this experiment to the next level and doing a control then comparing the total dry weight of plant produced after say , 4 weeks. Can use a less "useful " plant that can be cut down for the test, like lettuce or mustard
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For cannabis plants I am limited to just four by law. So it makes it hard to do tests by separating them. But yes I could do that with a less useful plant, though I would need to buy additional grow tents to trap the CO2 in. So it would be a costly experiment.
Maybe one day when I am allowed to grow more.