Help, leaves yellowing, I don't want my ladies to die!!!

Hey all! I'm new here and I need some help. I'm doing my first hydro-grow in an enclosed cabinet. I have a 250HPS, and I am using a combo DWC/top-feed system. Temps are 74-77 night and 80-82 day. My pH is normal and I had some problems with nute burn but I think I corrected that (those yellow blotches stopped spreading for a few days and then this problem occurred). I am now using 50% nute strength.

Yesterday afternoon I noticed the beginning of the leaf tips starting to yellow. I increased my irrigation time thinking I was underwatering. The next morning, the yellowing seemed to NOT be spreading and the plants looked good. This afternoon when I checked on the ladies, I noticed the yellowing had returned to the leaf tips and even spread to the leaf edges. Some leaves even felt "crispy" to the touch and some leaves are twisting/canoeing.

Please take a look at the picture below, I know it is not the best quality but I only have my cell phone to take pictures with. You can notice the canoeing in a leaf or two and the yellowing leaf tips/edges on others.

Any suggestions on what the cause is or how to solve it would be greatly appreciated. Good karma your way!

prob nute burn, i did the same thing. How old is your plant?

LemonAssistance said:

prob nute burn, i did the same thing. How old is your plant?

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I'm 99% positive it is not nute burn. I'm using my nutes at 50% strength. I had a nute burn problem, as you can see on the older, lower leaves in one of the pics. That's why I went from 75% down to 50% strength and they all responded very well immediately. If it is nute burn, is there a way to differ that from heat/light stress?

Plants are 4.5 weeks from seed.

PersonalJesus said:

I'm 99% positive it is not nute burn. I'm using my nutes at 50% strength. I had a nute burn problem, as you can see on the older, lower leaves in one of the pics. That's why I went from 75% down to 50% strength and they all responded very well immediately. If it is nute burn, is there a way to differ that from heat/light stress?

Plants are 4.5 weeks from seed.

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As you can see in this pic, some of my ladies are doing GREAT! Same cabinet, same nutes, same lights, same res, same everything!
What do you think?

some plants just doesn't grow too well.
if its only one plant consider it a runt and replace it.
I wouldn't bother fixing a plant at this stage.

McFonz said:

some plants just doesn't grow too well.
if its only one plant consider it a runt and replace it.
I wouldn't bother fixing a plant at this stage.

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I understand some plants just don't grow well, natural selection, genetics and all... I got 8 ladies, 4 are doing spectacular, 4 are okay... It's one of the spectacular four that is canoeing and showing yellow tips and edges. Isn't this caused by some sort of stress, usually? I just don't want to lose one of the best 4.

If there is something that I could do to fix this, I really want to try.

Thanks for the advice, I am thinking of taking out the 2 worst to make some room.

You have to remember that the phenos are different. It may be nute burn. That's what it looks like to me anyway. I would flush with straight water and go from there. .03

wat iz yer ph br0? keep at 5.8 br0 looks liek u haz lokout of da nutez omg chek da ph put som of da hydrogen peroxyde 6% omg 1 tbsp in da rez omg

PersonalJesus said:

I understand some plants just don't grow well, natural selection, genetics and all... I got 8 ladies, 4 are doing spectacular, 4 are okay... It's one of the spectacular four that is canoeing and showing yellow tips and edges. Isn't this caused by some sort of stress, usually? I just don't want to lose one of the best 4.

If there is something that I could do to fix this, I really want to try.

Thanks for the advice, I am thinking of taking out the 2 worst to make some room.

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if your other plants grow well and share all the same environmental factors it means your space is fine.
a plant that doesn't get along is an oddity and I wouldn't bother with it.
Also, at this stage I doubt how well it could recover.

zo0t said:

wat iz yer ph br0? keep at 5.8 br0 looks liek u haz lokout of da nutez omg chek da ph put som of da hydrogen peroxyde 6% omg 1 tbsp in da rez omg

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My pH is good, I had pH swings before and I corrected that problem. I keep it around 5.8/5.9 and check twice a day...
Hydrogen Peroxide? Why? I've never heard of this, but I love to learn!

Sm00th0Perat0r said:

You have to remember that the phenos are different. It may be nute burn. That's what it looks like to me anyway. I would flush with straight water and go from there. .03

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Maybe I'm an idiot, not maybe, I'm sure I'm an idiot... but regardless, flush with str8 water? in a hydro system? how?
And explain " go on from there " ? If I go right back to what I was doing, logic says the problem would return. My nutes are already at 50% strength. I'm afraid to go any lower and then have deficiencies of nutes...
And it prolly bears mentioning that I have no idea the strain, pheno, anything... these were top-shelf bag seeds I used to fine tune my system. Next run is ChemDog and G13 Haze.