Clawing leaves...

[shiva71]

The curling is as bad as ever. From GWE "Humidity is a factor that partly determines how much your plants will drink. If the air is dry, your plants will tend to drink more at their roots. If they’re already drinking more due to high temperatures, low humidity can cause them to drink a lot of water through their roots and uptake too-high levels of nutrients. If your plant takes in more nutrients than the plant can use, the leaves will begin to show yellow or burnt tips, which is the result of nutrient burn" So im thinking maybe this is my issue - very low rh (35%), plant absorbs too much through roots (this is very possible shes guzzling over a litre a day), leading to the nitrogen toxicity.
So i have my new humidifier going, will try and get it to 60% and keep it there.
Really hope this works!!!!

 

[shiva71]

She's had much higher humidity for almost 24 hours, no change
Ive tried:
Lowering temp of rez
Raising humidity
Dropping ppm down to 200
Raising lights (currently 24" from canopy)
Checked airstones
And nothing has made any difference. Very clear to naked eye are that the tips of stipules are a reddish brown. Also in the last few days some marks on a few leaves. That looks like a deficiency to me.
Im starting to think we were right all along, nitrogen toxicity. I have some CalMag and pk13/14 so today im thinking about using them combined to say 500ppm. That should be enough to feed her and completely eliminate N and see if theres any response.
Does that sound like a good plan?
Man this is doing my head in!!

 

[70's natureboy]

I guess you were right, it is N toxicity. They are looking worse now and getting a classic claw. The light color was throwing me off. I think your lights are making the symptoms a little wierder. They are probably sensitive plants too and don't like a lot of nutes. I hate to push floranova because they don't pay me but it's hard to screw up plants with that stuff.

 

[greg nr]

Raise the lights more, or dim them.

 

[its.always.420]

Agreed on N tox with that claw, yikes it sure got worse. lights look to be proper height now. You could try running water only in your bucket for a day. Check PPMs, see if she's puking back into the water. A good flush might be what she needs.

 

[curious2garden]

What is your pH?

 

[shiva71]

Many thanks guys. pH is under control. She got 500ppm of Cal Mag and PK13/14 so theres no N in there at them moment. If it is the N toxicity what should I look out for? Will the clawed leaves straighten up or should i just pay attention to the new growth?

 

[shiva71]

That didnt work, if anything the clawing got worse
She has a tank of pH'd water no nutes. If it is N toxicity, i thought maybe the ppm would rise as the plant pukes out the N? It hasnt, ppm has stayed the same. I plan to give her 2 days flush.
I dunno, ive been looking at my pumps and something isnt right. There's nowhere near the amount of bubbles coming out as i thought. My 2 13cm air discs had almost nothing coming out. Got some new disc air stones today and im probably gonna get a new pump.
Could lack of bubbles be the issue?

 

[70's natureboy]

Why so much cal mag? That's got some N too. If you are in RO 100 ppm should be plenty. I still think they need more light. LED grows always look wimpy to me because I am used to seeing weed under bright lights.

 

[cannabineer]

Why so much cal mag? That's got some N too. If you are in RO 100 ppm should be plenty. I still think they need more light. LED grows always look wimpy to me because I am used to seeing weed under bright lights.

Curious, not critiquing:
Wouldn’t they be stretchier if light was the main issue?

 

[70's natureboy]

Curious, not critiquing:
Wouldn’t they be stretchier if light was the main issue?

Good point, that would be my old way of thinking with old school genetics. I see so many short squat plants now that never get any height; and without strong light to force them along are perfectly content to grow at a slow crawl like a bonzai tree. If shivas plants were under bright light (at least 600 MH) they could better utilize all the nutes they are being fed. Maybe I'm wrong but that's my line of thinking. I'm a light feeder myself and would prefer to see an occasional yellow leaf than twisty bitter beer face leaves.

 

[shiva71]

Well, i have a 135W QB288 in a 2 x 2ft tent. Its only my 3rd grow so im still a rookie but i really dont think its a lack of light issue.
This was my last grow with exactly the same set up:
Cheers!