sgt. schultz
- 282
- 28
Been running 81*.
i've always been told what woodsman said . . . but i was wondering just last month what happens if the temp is 75° . . . . does CO2 help at all, or does the impact diminish 10%, 40% . . . . what's the story?
I found this graph, which helped . . . .
View attachment 345047
something important to note is that it is the leaf temperature that matters. i use a laser thermometer to determine where my temp is.
The general rule is 80/85 with CO2 and some of the new research is saying as high as 90, I run my rooms at 80/90 when running at 1500 ppm.
Col. Klink
Kicked it up to 83*. 5 weeks left. If anybody thinks bad move, help an old man out. Just want max out of co2. Those friggin large tanks from welding supply easily hernia enducing. 350lbs/160kgs minimum. Probably more like 400lbs/185kgs. For the effort I don't want to waste any. Full control of temp. Peace.
I'm very interested in how and why a VPD chart would be different for augmented environment vs not.
Capulator's thread about light and nutrient uptake definitely has a similar idea, I know CO² supplemented plants like to feed more.
Shit. I hurt just thinking about lugging a beast of a tank like that around... What drastically reduced my CO² usage was to go through and wrap all my ducting between my sealed and vented hoods with plastic cling wrap- same stuff you wrap bologna with. Cheap, it seals up little pinholes like the dickens, sticks to itself. I don't know if you have such ducting, but if it gives you an idea...
What is just as important as temperature is relative humidity; VPD theory says that humidity levels need to be carefully optimized to get best use of supplemental CO². Chart below, the point is to keep your op in the green;
View attachment 345443
I think you will be very happy with the results at around 85, I use BBQ tanks 20 lb much easier to handle. Been doing CO2 for 13 years and and love the stuff. Just stop it in the last 10 days of flower, this will help with bringing back more sent and flavor to your buds.
AS Tyy pointed out above VDP is important but it also changes when using CO2, the above chart is for normal CO2 concentrations of 400+-.
Check out some of my posts and you will see what CO2 can do when used right, my yield has gone up an easy 20% over no CO2. I stop using CO2 in the summer as it's to hot to use it so my yield goes down. I do grow some big trees and the combo of CO2 and RDWC can't be beat.
Can't load pix right now.....
I have never seen the VPD chart for higher concentrations of Co2,if anyone has that info please post it up.