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Auto's have taken really well to a heavy feed last night. Not really sure why plants of the same strain are nearly 3 weeks different in the flowering cycle though lol
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I need a white skunk looking good
I like the look of the super skunks and the white widow x skunk the most so far
I think the pineapple chunks are gonna be awesome too. cant beat cindy x cheese (I think the pineapple is cindy, could be wrong)
I would go with lights on, since that's when plants respire CO2, and with fans off otherwise you are exhausting all of that additional CO2 out of the grow area.
As I understand it, cannabis can take advantage of additional CO2 when the temperatures are over 85 degrees, temps lower than 85 degrees and the plants have no need for additional CO2. The higher the temps, the higher the levels of CO2 that the plants can actually utilize. Ideally you would have a CO2 system that would come on when temps are over 85 degrees but if you know the temperature cycle of your grow room you could time the CO2 cycle to turn on around the time that your grow room temps reach 85 degrees. Otherwise, I would suggest adding CO2 towards the end of the day when the grow room temps will be the highest, but really anything under 85 degrees is just a waste of CO2 as there is plenty of CO2 in the atmosphere for cannabis at or below 85 degrees.