First week in flower, some deficiency

Purple Kush in 5g pots with promix hp.

Just flipped to flower 7 days ago, on day 4 leaves began to curl a bit. Also noticed some leaves are starting to yellow while the veins stay green. Any help narrowing down the deficiency as I believe a few nute deficiencys will cause the yellowing. The curling took place pretty soon after putting it into flower, where I have a co2 burner. Could my co2 level be too high and causing the leaf curl and deficiency??

Also, when the lights are off, my burner isnt running, but the co2 level raises to 1900ppm from the plants. I have no intake or exhaust to exchange the room with fresh air, its not a 100% sealed room, but I have nothing drawing air in, is this a problem?

PH 6.3
water temp 68
co2 burner set to 1500ppm (is this too high for week 1 flower)

Nutes: (per gallon)
Week 1
GH Micro 8ml
GH Grow 6ml
GH Bloom 8ml
SM90 3ml
Diamond Nectar 15ml

Keep in mind that CO2 in Earth's atmosphere sits around 300PPM, which could be why you're CO2 levels are getting so high.

Your plants don't look like they are doing too well with the environment you are giving. I know your using co2 and it may have cost you a bundle but, I recommend fresh air in, asap, either passive or assisted and an exhaust fan for healthy air exchange. Remember... the only time co2 is beneficial is when all other aspects of environment are maxed out. I predict wthin 2 days your plants will be going strong if you take this advice. Oh and for the deficiency you mentioned? Couldn't see it *yellow with green veins* but I do know what you mean, check this out; (take pics when lights are out or pull a plant out so we can see the issue better)

^^^^ shit sorry about the pic clarity. Find this chart by google imaging " cannabis deficiency chart" and maybe you can work with that better. GL man. ~ BCbuddy420

Here is a couple pics in normal light. Do you think I should stop using co2 all together, or should i just set up my intake and exhaust to run when the lights are off?

Iron..wag

Looks like Chlorosis. Get yourself an exhaust fan! No intake fan needed! There is no need to use a co2 burner also. But if you insist on using it then set the co2 to max 1100 ppm. Everything above is contraproductive.

what's your water schedule? how much water? how often? media? size of containers? how dry is media before you water?

keep you co2 gen going. theyre good. if you're really concerned, vent the room at night.

I alternate water and food, it usually works out to every 2 days. I wait until the soil is dry on the top couple inches, and always pick them up to see if they are heavy or light. I give them 2 litres each, they are in 5 gallon pots with promix hp.

jonathanfrost said:

keep you co2 gen going. theyre good. if you're really concerned, vent the room at night.

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I totally disagree. Those yellow spots will stunt new growth if not fixed!

hoop, i don't believe the co2 is causing those problems. it looks like severe over watering and some extreme deficiency to me.

whoaaaa... i just read your nute dosing. dude, why have you strayed so far from the GH feeding schedule? and why sm-90? have you had pests before?

you:
Micro 8ml
Grow 6ml
Bloom 8ml
Nectar 15ml

GH recommends for week 2 of flower
Micro 4ml
Grow 1ml
Bloom 5ml
Nectar 2.5ml

per gallon. you're cooking your girls. http://generalhydroponics.com/site/gh/docs/feeding_sched/GH-FloraSeries-DTW-Charts.pdf

jonathanfrost said:

hoop, i don't believe the co2 is causing those problems. it looks like severe over watering and some extreme deficiency to me.

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You misunderstood me. I agree with you. The yellow spots are not caused due to too much co2. It is most likely his feeding schedule that causes this problem. What i didn't agree with was your statement that his plant is fine for i think its not. My concern about co2 is based on a study that discovered that ppm level above 1200 decrease yield.

interesting. you have a link to that study? every one recommends 1500 ppm, but i've never seen that number backed by any thing. i'm always interested in legit research.

jonathanfrost said:

interesting. you have a link to that study? every one recommends 1500 ppm, but i've never seen that number backed by any thing. i'm always interested in legit research.

Click to expand...

https://www.icmag.com/ic/showthread.php?t=221893

Hope this can help you for now.

Sometimes less is more

great read, man. the dude is spot on with references. about time i got some real info on CO2 ppm. gonna turn mine down in a few.

glad i could help you

Ok,
Your plants are clearly shutting down in a dehydration type mode....the down and in curl. This happens for a few reasons. The most likely for you is high EC(ppm) in your media. If the EC of media gets higher than the EC in the plant then water is literally removed from the plant to the media......this is osmosis. Which is not to be confused with active transport, which is how they take up nutes. So, if the GH guidelines mentioned above are accurate and you are that much over then it makes sense that the media EC has built up, yes? A quick check of the runoff will confirm this. If that's the case, simply flush the media and back off on your nute strength.

CO2 poisoning is very real but unlikely at those levels. However, whatever the problem CO2 should be turned off immediately and not returned until the problem is corrected. Accelerating growth now is not wise.

Hope this helps. Peace

GK1 said:

Ok,
Your plants are clearly shutting down in a dehydration type mode....the down and in curl. This happens for a few reasons. The most likely for you is high EC(ppm) in your media. If the EC of media gets higher than the EC in the plant then water is literally removed from the plant to the media......this is osmosis. Which is not to be confused with active transport, which is how they take up nutes. So, if the GH guidelines mentioned above are accurate and you are that much over then it makes sense that the media EC has built up, yes? A quick check of the runoff will confirm this. If that's the case, simply flush the media and back off on your nute strength.

CO2 poisoning is very real but unlikely at those levels. However, whatever the problem CO2 should be turned off immediately and not returned until the problem is corrected. Accelerating growth now is not wise.

Hope this helps. Peace

Click to expand...

When salt in the soil dissolves, it separates into sodium and chloride ions. The ions act differently to damage the tree. In early spring, the chloride ions can be taken up by the roots, enter the sap, concentrate in the shoots, and prevent buds from opening. Later, they can be transported to actively growing leaf margins, causing leaf scorch, curling, or death. Sodium ions use the same "chemical route" as necessary tree nutrients. As George Hudler, professor of plant pathology at Cornell explains, the sodium can "tie up the plant's shuttle system and restrict uptake of magnesium and potassium, two chemicals that are essential for making chlorophyll." Potassium deficiencies are common in plants suffering from salt injury, says Hudler. Salt in the soil can create a physiological drought. Brine near underground tree roots can be a more concentrated solution than the sap in the roots. The roots therefore can't take in water through osmosis. Water is so unavailable to salt-stressed tree that they are actually dying of thirst.