Tom Barr;115713 said:Pores, meaning Stomata? Most aquatic plant stomata are non functional.
I meant channels, the voltage gated kind and the passive diffusion kind.
Tom Barr;115713 said:Pores, meaning Stomata? Most aquatic plant stomata are non functional.
Solcielo lawrencia;115724 said:Streaming is just O2 rising to the surface at metered intervals. It can also occur on non cut stems, as I have just seen from the HC. Also, since I closely matched the amount of GH added, no gas bubbles were formed at the HC, unlike the previous three days. Just some pearling/streaming.
Again, I did NOT say that pearling is an indicator of growth, even though it is as a result of photosynthesis. Please read what I wrote and not what you think I wrote. Just because the word pearling and growth are in the same paragraph does not mean I said pearling results in growth or whatever. This is the third or fourth time I said this.
Anyway, I found the answer to my previous question about tonicity. Yes, even plant cells lyse or crenate due to changes in osmotic pressure.
Solcielo lawrencia;115729 said:Here are pictures of the pearling over three consecutive days' water changes. Each water change was 90%. I did not take a picture of last nights water change because there was no pearling. Below each picture is how much GH added to the fresh water during the water change. Fertilizers added after the water change include NPK in roughly the same amounts.
View attachment 4550
3/5 tsp of CaSO[SUB]4[/SUB] and 2/5 tsp of MgSO[SUB]4[/SUB]
View attachment 4552
2/5 tsp of CaSO[SUB]4[/SUB] and 1/5 tsp of MgSO[SUB]4[/SUB].
There are even more gas bubbles on the HC.
View attachment 4551
2/5 tsp of CaSO[SUB]4[/SUB] and no MgSO[SUB]4[/SUB]
This last photo shows that the gas bubbles are the largest probably because I added the least amount of GH.
Also, considering that last night's (7/1/13) WC (GH matched closely with the previous days' concentration) had no pearling like the ones seen in these pictures, that pretty much debunks the high gas concentration of tap water forming on the plants.
Solcielo lawrencia;115747 said:All I'm saying is that osmotic pressure can force gas out of plants. That's all. This can explain why it appears that plants pearl more after a water change as has been mentioned previously in this thread. I mention this so that you and others can test it to see if you can verify that changing GH of incoming water also has the same results that I'm seeing. It is only in my tank that I see this phenomenon and would like to know if others observe this phenomenon as well. I am not out to prove anything here, but I am out to see if my observations can be replicated by others. I'm also not trying to convince anyone with the hypothesis that it's osmotic pressure that causes plants to grow faster since it's just a hypothesis that needs to be tested. When I have a theory (that is backed by extensive testing) to explain this phenomenon, then I'm trying to convince you.
Also, how can you explain that the last water change induced no visible gas on any of the leaves of HC? Whereas the previous three days all induced gas from it? The only difference I accounted for was GH, matching the previous day's water change. It's the same tap water so the same dissolved gasses should be present.
Solcielo lawrencia;115747 said:All I'm saying is that osmotic pressure can force gas out of plants. That's all. This can explain why it appears that plants pearl more after a water change as has been mentioned previously in this thread. I mention this so that you and others can test it to see if you can verify that changing GH of incoming water also has the same results that I'm seeing. It is only in my tank that I see this phenomenon and would like to know if others observe this phenomenon as well. I am not out to prove anything here, but I am out to see if my observations can be replicated by others. I'm also not trying to convince anyone with the hypothesis that it's osmotic pressure that causes plants to grow faster since it's just a hypothesis that needs to be tested. When I have a theory (that is backed by extensive testing) to explain this phenomenon, then I'm trying to convince you.
Also, how can you explain that the last water change induced no visible gas on any of the leaves of HC? Whereas the previous three days all induced gas from it? The only difference I accounted for was GH, matching the previous day's water change. It's the same tap water so the same dissolved gasses should be present.
Solcielo lawrencia;115902 said:I know that O2 is transported down to the roots but why is it still the case that O2 saturated water grows plants better? Is it because it supports aerobic bacteria and their metabolism helps create nutrients that are easier for plants to absorb?
Do plants grow faster at night or in the day? During the day, plants are actively making sugars. At night, they break down those sugars for energy. However, I've noticed that some plants make larger growth gains during the night, at least in terms of internode length. I wake up in the morning and some Rotala's are taller than before I went to bed.
Solcielo lawrencia;117467 said:About limed water, the process of liming removes CO2.
"The slaked lime is also an efficient absorber of carbon dioxide, so tapwater treated by "lime/soda" softening generally arrives at the household tap still depleted in CO2, which contributes to its high pH.
http://www.skepticalaquarist.com/municipal-water-softening
So I don't think limed water contributes CO2 in an aquarium.
Solcielo lawrencia;117467 said:About limed water, the process of liming removes CO2.
"The slaked lime is also an efficient absorber of carbon dioxide, so tapwater treated by "lime/soda" softening generally arrives at the household tap still depleted in CO2, which contributes to its high pH.
http://www.skepticalaquarist.com/municipal-water-softening
So I don't think limed water contributes CO2 in an aquarium.