Did you divulge to the plant physiologist what plants and what light levels you are using. His explanation that the same light- and CO2 levels will have the same carbon fixation might hold as an approximation for lower light intensities (the linear region). But at 1200 umol/m2 you are far away from linear. A higher temperature will lead to larger stomatal opening -> better gas exchange -> higher internal CO2 concentration -> higher carbon fixation rate. In other words the light saturation point shifts in your favor.
Just looking at the buds, the ones on the right are ahead in terms of structure, they are not the same buds as on the left with inflated cells.
Interesting. Blue light also increases stomas activity.
Ya he nows what's going on. That's why I said it was a very simplistic possible reason. Other things happen in reaction to compensate like you say. I' want to see how increased co2 will effect the led.
Gavita says it's linear to about 1000µmols. Then begins to diminish. But light saturation is a ways away. Farther than I am away from
Just my two cents on co2
Never will i run co2 from a tank and regulator, too much work for small increase. And too much money adds up by excanhging tanks every week.
I highly rec a propane burner with exhaust ports, more efficent with less having to exchange bottle every week. More like once a month. Plus exhaust ports make it much easier to handle in terms of heat. And of course ur going to need a co2 controller or a chh4
This one is expensive, i got one for about 300$
I guarnetee the co2 tanks will pass the 300$ in one grow.
https://www.google.com/search?q=plug n grow co2 gen&client=safari&hl=en&source=lnms&tbm=shop&sa=X&ei=8A1hU9abA8W22gWOuYCYBg&ved=0CAcQ_AUoAQ&biw=320&bih=444#spd=4014437666740343032
30% isn't a little. Just 15-20% is worth it. That turns a good grow into a great one. And a great one, to a record breaker. And probably a poor one to decent one.
Even if the vent helps...its more heat than I want.
Plus I got 3 free tanks...so I'll get to see if it's worth it for when I have to pay.
And since it will be all led, there will be less need to vent and waste. It will be totally sealed, not having to bypass vent the hps is key.
When increasing co2 levels .you need to increase o2 levels as well.
imo adding co2 is best for sealed rooms. If you run in fresh air from outside via intake and exhaust. You will have plenty of co2. You want your o2 levels higher than co2. For proper respiration.. Outside air is less than 1% co2.
1200-1500ppm. Clearly shows it's benefits in many actual applications and on paper.
With just intake/outtake it should be right around 400ppm CO2. Not even close to what is used for enrichment(1200+).
But less than 1000ppm and there isn't a point.