Quote Originally Posted by forcus master
Plants use co2 for assimilation in its all growing stages. Normal air co2 levels in are about 0.035-0.040%. When co2 level is raised up to 0.15% the assimilation and growth speeds up. That is what is said. Dunno if it have any special effect, but it cant harm them.
Yes I am using cfl for flowering. 125w ESL Growlight Red spectrum lamp for all plant flowering stages 2700ºK
Soil is ph.6.7 special for self watering pots.
I had basic nutrients for growth NPK 6-1-5 and marine oxhylium.
For flowering Captain Acids 2 component nutrient.
Component A NPK 0.5-8-1.3 Mg 2.6% K2O 1.6% P2O5 18.3%
Component B NPK 0-22.6-28.2 K2o 34% P2O5 52%
It won't harm them but it'll be a waste of co2... fresh air is between 300 and 450 ppm which is more than plenty for your plants. if you were growing in a completely sealed cabinet that would be one thing. I would save your co2 tabs for about 2 weeks after the initiation of flowering when they start their rapid stretch... And also have you ever considered brewing beer/alcohol as a means for co2 production? I've been using that method and have had great results... If you can monitor it raise the co2 ppm to around 800 to 1000 shortly after flowering and let the temps come up alittle bit and you'll see a huge explosion of growth.