Plants, CO2/O2 etc.
Subject: Plants, CO2/O2 etc.
John Shane wrote:
<snip long and informative post>
> Therefore, there are almost certain
> even in the light, where there is more CO2 being produced by our
> plants than is being consumed, even when the plant is not "rotti
> fact, I suspect that this gradual "loosing ground", resulting fr
> limiting factor (unfavorable light intensity, nutrient deficienc
> what causes the gradual failing of plants so commonly reported b
> plant enthusiasts.
I am sure that you are correct in the case of "beginner" tanks
with plants in them that are not properly set up. I also
understand that respiration is continuous, but it was interesting
to hear that photosynthesis will continue (at least for a while)
even in the absence of light.
How long can a plant "store" light energy and continue to
photosynthesize? I have repetedly tested the )2 levels in my
planted tanks. They run about 11 mg/l during the photoperiod, and
drop only to about saturation even at the very end of the dark
period. I assumed that the tank was just "coasting" on O2
reserves made available during the day. I have also noted that
without any addjustment to my CO2 flow, the pH in my tanks only
varies by about .2 during a 24 hour period. I often wondered why
the pH didn't drop more if CO2 continued to be pumped into the
tank, and the plants stopped using it. Maybe the plants _haven't_
stopped using it? The tanks are very well lit, and supplemented
regularly with trace elements. What do you think?
Thanks for the interesting post!