hi peeps
was talking to an old grow friend today
and co2 came up
he recons that if i use a sodastream and spray them every night after lights out that will be good for co2 uptake from the plants.
it sounds logical to me...
so what about giving some water a zap with co2 then add the nutes and feed the plants it direct in the soil?
will that work ?

wee-willy

No i'd say avoid that. buy a co2 cylinder and diffuser tubing and control unit.

will it do any harm?

plants only use co2 during lights on, and obviously spraying your plants with the lights on is a big no no

it wont help, and will inhibit very slightly, plants use oxygen to metabolise sugars stored during lights on

its a few years since i tried using a drinks syphen, i took the tube from the back and had it coming out the front, i was using a 400w halide at the time, i only used it during the veg stage, i opened the door enough to put the tube through, i only did 3 quick hits and quickly closed the door, it worked a treat, a good mate of mine commented on how good and healthy they looked, we both agreed it improved my plants.

Plants don't uptake CO² via the roots.
It is true that the roots benefit from the leaves uptaking CO², however, injecting CO² to the root system will have nothing but detrimental effects.
Roots require oxygen, CO² will suffocate them.

You can try fermenting sugar, water and yeast in a bottle, and only open the bottle at the dark period.
This technique is commonly used with fish tanks. Example

Leaves only take co2 from the underside of their leaves through the stomata, also co2 is used by the plants more in higher tempratues, i looked into using those soda stream re-fill bottles for my room but i couldn't find where to buy them and my ventilation would probably take it straight away donjon's advice on roots is spot on, but the plants at night don't photosynthesize so co2 would be pointless, and in the night the plant puts its energy into making roots and uses the oxygen from the roots that produces co2

adding Co2 when lights on will indeed improve health and vogour.
To ensure your added Co2 will be properly used , you might want to turn of the air-extractor a short while when adding ( in case you'd use a gas-cylinder)
During veg the plant can be given CO2 without a problem.
In flower you might want to change the regimen , and wait until mid flowering , when bud leaves are being formed.
Plants that are given extra Co2 will stretch more, and create more water vapour.
It's certainly no problem in winter grows.
The yeast and sugar method will work nicely because of i's relative low adding of Co2.
You can hang your lights a little lower too, because of this adding of Co2 ( plants can take higher temps when you add Co2)
Simply place the yeast and sugar mix in front of your air-intake.
Be sure to refresh on time, every ten days will be enough ( some only change their yeast every 2 weeks).

Adding through cylinder is a difficult process of fine tuning , as the plants actually need higher temps, thus using more water , and putting out more humidity(wich can be problematic as you will need to turn off the air extractor at times to ensure efficiency).
Plants that are in hotter surroundings need more nutes, but be careful not to burn the roots ..

I myself never dared using Co2 cylinder because of the various risks involved( did I already mention the risk of Co2 poisoning for both humans and plants?)

Best of luck.

Yes, you're right, I meant: opening the bottle during lights on.
My mistake!

waste of time unless its a closed loop air con'd co2 measured job . theres enough co2 in the air to grow perfectly well and what you'll spend on cannisters/bottles won't be given back in bud terms anyway

errr.... yes it is, many times over. a well tuned co2 grow can give 2g/watt. if you have no more space and no room for more light, then co2 is really the only way to increase yield, and it will give a MASSIVE increase. it is a pita though. you can get a semi decent setup for less than 300 notes (telaire co2 controller, 80-130, bottle 50, 15 for refills, need maybe 1 - 3 refills per grow depending on size of grow, 100 for pressure regulator + solenoid and other gubbins) f you only boost your grow by 3 Oz then your kit has paid for itself, upped my yield from an average 8.5-9, to an average 14-15, and it was FAR less than optimal

thats a proper set up

i said what he'll spend on soda stream cannisters wouldn't be worth it.


even with some pro kit its been mentioned by a few on here that its not really worth the hassle

oh right, sorry, missread you

thanks folks for all your input.

i was reading on the tinternet about co2-tabs that are put into the water before watering
here is what they claim..
With Co2 Tabs you can offer the carbon dioxide directly to the roots of your plants and significantly increase the speed of growth.

so is there any truth about giving co2 in the water?

i just wanna do the right thing

wee-willy

just save your money mate. you wont notice a difference, i shouldn't think, and you should learn to walk before you run.

Snake oil.... They are just bicarb and dry acid tabs just like Alka-Saltzer tabs... I pulled some of this from a post a few years ago: