CO2 uptake by the plants roots. evidence

[atmosphere]

There has been a lot of discussion about this issue especially on O.G.
It turns out that cannabis is capable of taking up to 25 % of the total CO2 absorbsion with thier roots .

Especially with hydro CO2 in your water can be very usefull because for example in rockwool mediums there is no CO2 present at all . In Nataral soils however we find a certain amount of CO2 present .

Plants take up most CO2 through the air ,there is no doubt about that . When your CO2 level in the air is too low its not so easy to bring it up again, this is often expensive . But there is also the possibility to add CO2 to your tab water


There is scientific evidence that cannabis is capable of taking up CO2 with thier roots . The report is too large to copy en paste it here .
Those who who would like to see it can do a request , and it will be send to you . I can tell you where to do the request .

 

[Guest]

So... where is the evidence? Need links =]

 

[jojajico]

just copy and paste it for everyone to see. just take multiple posts to do so.

 

[Guest]

Not sure I'm following the benefits of this. I mean let's assume for a moment that a tiny amount of CO2 is indeed absorbed by the roots. Uhhh.... ok?!

I can only imagine how many people will see that and run right out to get soda water for refilling their rez.

Other than the scientific proof that CO2 is actually used by roots - can you provide any information that would show the benefits of such? Otherwise seems like a trivial piece of reading.

 

[NorCal]

evidence? yet no proof/evidence?

 

[jojajico]

Not sure I'm following the benefits of this. I mean let's assume for a moment that a tiny amount of CO2 is indeed absorbed by the roots. Uhhh.... ok?!

I can only imagine how many people will see that and run right out to get soda water for refilling their rez.

Other than the scientific proof that CO2 is actually used by roots - can you provide any information that would show the benefits of such? Otherwise seems like a trivial piece of reading.

the reading isnt trival its theoretical. if i read something that said that the roots can absorb 25% more CO2 then i would not think "fuck it i need to see a study done" i think "how can i setup an experiment to see for myself" synthesize a hypothesis from available data and put it to the test.

the second i read his post i started thinking how can i add more CO2 to the soil grow, i wonder how much this contributes to yeild ect. but i still want to read the study for myself.

the benefit as i see it if they can absorb up to 25% of the plants CO2 its an area of the plants capabilities thats not being exploited. possibly 25% greater carb production. now a setup to get CO2 to the roots and the cost of said CO2 may not be worth the additional yeild in commercial grows but i bet for a small time hobbyiest it would be ie getting the maximum out of your available light wether its a 250 watt hps or 2Ks of hps light.

 

[atmosphere]

You can ask for the study in here www.nomercy.nl/forum and it will be send to you . (Go to the Englisch section of the forum )

It became available only recently

 

[alphacat]

You know what's funny - I started down this road a while back (first via co2 as possible foliar spray, then investigating through the root-absorption avenue)...

http://www.icmag.com/ic/showthread.php?t=46627

...and I do have some firsthand experience with the viability of the results - granted, not with cannabis though. It works extremely well with aquatic, emersed, and normal soil plants.

I was wondering if using a mixture of h2o2 (hydrogen peroxide) and liquid carbon would boost the efficacy of both - maybe mixing at a ratio of 1 part co2 supp. and 2 parts h2o2, or something like that... however, until I get the next growroom finished and the cycle dialed, this is an experiment for someone else to pioneer...

 

[jojajico]

i was thinking of actually pumping the CO2 into a array that sits in the pot. would take alot of tinkering to figure out the roots uptake ability though. lol can u measure parts ppm in soil. or perhaps it would work better in a bucket system... hmm very very interesting.

 

[alphacat]

I'm not sure if soil co2 concentrations are measured in PPMs but I don't know why they wouldn't be.

There's stuff like this: http://www.vaisala.com/businessareas/instruments/industries/earth/co2soilrespiration - which are scientific probes designed to measure co2 in soil - or if you know someone with a spectral chromotagraph rig... (LOL!)

Alternately, the easier but more time consuming way to figure this out is to simply set up a few control grows and co2-supplemented unplanted soil containers matching your current grow conditions as much as possible, then you just weigh 'em and compare the end weight of the non-co2-supplemented soil versus the weight of the supplemented soil...

 

[jojajico]

i think the best way to do this is to discover the point of diminishing returns. ie start at low levels and work your way up using clones ofcourse. so we can establish a level similar to that of foliage CO2 absorption. considering that it was stated that they can absorb 25% of the the plants CO2 then maybe the root level of CO2 should be 25% of the CO2 supplementation level (1300 -1800 ppm) 325 - 450 ppm. that may be a good place to start anyway.

 

[alphacat]

That's a great way to start - the applied side!

 

[Greenjag]

It seems like the suggestion is to use trial and error with adding extra CO2 and observe plant results. I'd be a lot happier knowing what I'm doing before my plants start whining at me. Are there any CO2 meters for liquids that are affordable to most growers? I know I'm aerating my rez with air containing 385ppm CO2, but beyond that I haven't a clue how much CO2 to add to achieve 25% saturation of the liquid itself.

Also, there's a thread around here that suggests that excess CO2 in the feed can bump up the PH level. Some folk are putting their air pumps outside of their CO2-supplemented rooms to avoid excess CO2 intake directly into the feed.

I sense a conflict here somewhere!

 

[atmosphere]

plants will only benefit when they are healthy and CO2 is the weakest part of de chain ( of all the factors involved )
Its about adding CO2 to your water ,it dissolves in it. There is a device that does this . It contains a piece of carbon wich will be oxidized to CO2 . I'm not sure it is still available.
The owner of the site and forum that i mentioned here has done lots of experimenting /testing on this issue . f.e. setting up pilots to compare sesults.

Especially in warm growrooms thier often will be a lack of CO2 ,this will the factor that limits photosynthese . Adding CO2 to the water is a cheap way to do something about that .

 

[kokua]

pumping too much co2 into a rez is going to JACK your pH...

CO2 dissolved in water forms carbonic acid (H2CO3). With weakly buffered water, like what comes out of the tap in my area, adding too much CO2 can bring the pH down to as low as 3.

http://saltaquarium.about.com/cs/phalkalinity/a/aa061301.htm

You've got to know what you are doing, or at least do some further reading before attempting to add co2 to a hydro system...

 

[alphacat]

...Which is why starting small and ratcheting it up in tiny increments is probably not a bad idea.

One thing I'm not so sure about is whether or not (or if so, how much/fast) liquid carbon that's designed as a water additive will turn into carbonic acid. I tend to think it'd happen much less than traditional gas co2 delivery, and here's why; carbonic acid is essentially water + co2 fused into a single molecule (H2CO3 = H2O + CO2)...

...but using liquid carbon supplementation, you're not adding that extra oxygen atom as found in co2 - just complex carbon that breaks down easily in water - so basically one piece of the catalytic reaction that converts it into carbonic acid is missing.

Any chem majors in here that can verify or refute this for us?

http://en.wikipedia.org/wiki/Carbonic_acid

 

[atmosphere]

I'm not talking about bringing your ph down to 3 !!

There already are hydro growers that add CO2 to thier water . This it not so strange , because this is also done in aquariums to stimulate plant growth by using CO2 tabs .
There are tabs adapted for the use of growing cannabis .

 

[pico]

I don't understand why you won't post the article?

If you already are running CO2 in your room it will be in the soil or in your reservoir. When you water it pulls down air in to the root zone. The airstones in your reservoir would pump that CO2 enriched air in to the water. Some people are finding this is a bad thing. They are having pH swings because of the carbonic acid being produced.

 

[jojajico]

I don't understand why you won't post the article?

If you already are running CO2 in your room it will be in the soil or in your reservoir. When you water it pulls down air in to the root zone. The airstones in your reservoir would pump that CO2 enriched air in to the water. Some people are finding this is a bad thing. They are having pH swings because of the carbonic acid being produced.

good point

 

[atmosphere]

I don't understand why you won't post the article?

Its not just an article , its an investigation report that has lots of pages.