Late flower deficiencie help pics

OldMedUser

OldMedUser

Well-Known Member
ANC said:
You could use a trick from the aquarium trade, get a secondhand CO2 bottle and regulators, a Milwaukee or similar pH controller and use CO2 to adjust pH in your res automatically.
Click to expand...
I must have read 100,000 or more posts about growing pot on various forums and never once heard of anyone using CO2 to pH water for plants. I have read a couple threads where the OPs figured that they had come up with a brilliant idea to feed CO2 thru their airstones in the mistaken belief that it would somehow supercharge their plants with needed CO2. Don't recall anyone actually doing it and writing about it.

Every single response shot that idea down in flames and rightly so. Some were curious and urged the author to go for it but I never saw anyone do it. I've been thinking for a long time about enriching the oxygen that gets pumped into the rez and to me that's a sound idea but I haven't tried that yet as getting a bottle of O2 and a flow gauge was a bit more money than wanted to spend on the experiment. What with being broke/cheap/Scottish/Canadian and all that. :)

I just did a little searching for CO2 in aquariums and it seems it's only used for planted aquariums to supply CO2 to the plants and keep the pH down a bit. As there are no growing plants under water in a rez needing CO2 it sounds like a non-starter for growing pot. pH down or some other acid sounds like a better idea to me and that's what everyone seems to use. I used conc. sulfuric acid to lower my pH in DWC before I started using pH Perfect nutes. 4 - 6 drops in a 50L tub would bring the pH down to around 5.3 from 6.3 and it would creep up again to around 6.3 in 3 days which was when I would top up with RO water and test the pH and PPM and make my adjustments again.

Fish sure seem to take a lot of fussing around with so I think I'll stick to growing pot. I've tried smoking fish but they are a bitch to keep lit. ;)

:peace:
 
ANC

ANC

Well-Known Member
@OldMedUser
You see, in aquariums, we need a certain amount of CO2 added when using bright lights as there is much less than in the air and it is required for photosynthesis.
Many of the popular fishes like their water on the acidic side of neutral. Now there can be some anomalies due to the substrate the plants are in reacting, but generally, there is a fixed ratio of pH, reducing as CO2 ppm's increase. CO2 and O2 are not mutually exclusive, With plants being given light and CO2 they transpire and exhale O2 back into the water so that O2 levels can be higher with CO2 added than without. Plants like to take the CO2 through the leaves and their O2 through the roots. So, you still need to agitate the water surface with bubbles or a pump.

Now you get fancy controllers that can control pH up as well as down and ones that will just Control it downwards using CO2. There is a probe that sits in the water as well as a CO2 diffuser which will only be getting CO2 from a Cylinder as long as the solenoid controlling the valve is powered on by the controller. I.e. if the pH creeps up, it will dump some CO2 into the res to push it back down. It is beauty lies in the simplicity, and it is not very expensive.

http://boards.cannabis.com/threads/using-co2-to-control-ph.59113/
 
Last edited:
OldMedUser

OldMedUser

Well-Known Member
I need me one of those solenoids and a CO2 controller for the grow room. Already have a big, (now empty), welder's CO2 tank and the flow regulator but no cash for the other stuff.

Love catching fish in rivers but never had any desire to raise them. :)

Thanks for the info. :)

:peace:
 
ANC

ANC

Well-Known Member
If you search around on plantedtank.net you will find a few good DIY discussions on which loose parts to buy to put together a good system that is easy to adjust.
 
H

HelloHydro

Member
Here are more pictures for the past 2 days my pH has been within range 5.8 6.2 drifting back down to 5.7 and back up to 6.1 or 6.3. The ppm's are staying around 500 now.
I'm not going to do a res change since I think it might be eating now. With the new pictures is anybody certain that that's calcium magnesium deficiency or phosphorus?
 

Attachments

OldMedUser

OldMedUser

Well-Known Member
For sure that's not Mg and it doesn't look all that much like P either. Mg starts with interveinal chlorosis that works in from the edges of the leaves and P has random blotches that often look dark purple/black.

It almost looks more like water damage or a fungal infection. Take a look at this chart and se it that helps you any tho I don't see anything that matches what you have there. If you don't see it getting worse and you think the plants a re getting back on track I wouldn't do anything for a bit. Often just a change in pH or feed levels can fix what's ailing a plant.

marijuana_deficiency_chart_jorge_cervantes-big.jpg

:peace:
 
Jypsy Dog

Jypsy Dog

Well-Known Member
HelloHydro said:
Here are more pictures for the past 2 days my pH has been within range 5.8 6.2 drifting back down to 5.7 and back up to 6.1 or 6.3. The ppm's are staying around 500 now.
I'm not going to do a res change since I think it might be eating now. With the new pictures is anybody certain that that's calcium magnesium deficiency or phosphorus?
Click to expand...
CLASSIC CALCIUM Caused by pH lockout.
 
You must log in or register to reply here.
Top