Please help

Hi all and thanks in advance for advice.


So a little about my set up I have only 4 plants in a 2.4x1.2 tent with two 600w digital hps and one 315wcmh light, growing in coco pearl with 16ltr pots Using cx nutrients.
This is my second grow and the same thing has happened in the start of second week of flower as per the pictures both times.

At first I thought it was N toxic but this time I have used far less N and still happened again even gave them half the amount recommended on the feed schedule, I keep ph close to 5.8 sometimes going to 6 and 5.7.

I am starting to think it could be root bound as from what I have read the symptoms seem very similar. I have 15 gallon fabric pots to transplant them to if need be but will only do that if the benefits outweigh the risk.

And on another note the plants stopped growing the second the leaves started curling in.

Danflying said:

And on another note the plants stopped growing the second the leaves started curling in.

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What do you water with? Nutes? Cal mag?

I use the cx range and follow this chart, with 1~2 ml a and b, also cut down on the mighty growth very much this time since flip. Also use wilt gard most watering.

Nitrogen toxicity perhaps

Hugo Phurst said:

Nitrogen toxicity perhaps

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Thanks

That is what I first thought, little wee popcorn buds for me again l. Haha

Coco grown plants in my experience prefer to be a little tight in their living quarters; I doubt it's root bound. It does appear your leaves are a bit dark, but I don't know I'd go as far to say they are suffering from N toxicity. I would think if there was so much N in your feed to exasperate the curling of those leaves like that, you'd be seeing major burn, among other things, but I could be wrong. In my mind, as grossly as those leaves are curled I would say you've got an issue with your feed pH. I would go back and check all your processes in terms of preparing your feed. If you premix your feed and store it in a reservoir, I would be checking it daily to be sure your pH isn't drifting too far out of range. Once you're sure of the pH, I would mix up 25% - 50% nutrient solution based on where you are in flower, pH'd accordingly, and feed her. Pour enough feed in so you get plenty of run off. This will reset your medium and your plant should recover. That's the beauty of coco...you can reset and try again on the fly. And remember, don't let your coco dry out between feed, feed every day and never water with 'empty' or plain water.

Thanks for the advice.

Come to think of it the problem could be PH as a few times I have not checked when feeding on a mix made days ago. I did flush when I first seen the problem when it was not so bad, flushed with 5.8 ph water then I fed them half strength but left out all nutrients containing N.
I have since calibrated the ph pen which may of been a contributing factor. I will give them another flush after work and do as you suggested. I hope they can bounce back and soon.