Nute Burn?

I have 3 plants in 4 1/2 week of 12/12 and his lsd is showing signs of burn it looks like?
I am flowering with a 400w hps and using holland secret nutes....Temps stay in the mid to high 80's and the hps is about 8 inches away and the reflector is not air cooled.


About a week ago I noticed the tips were getting crispy so I topped off my res with fresh water and no nutes for the whole week..

There are 3 plants in a scrog and only the lsd is showing these burns..It is also the biggest. Could this be a sign of root rot? The roots have been showing on the bottom of my pots for about 4 weeks now but the ones that show soon die...

Bumping this once...if I get no help I'll leave it alone.

Its probably nute burn, the ends are curling up and dying. If not its lacking magnesium, potassium or calcium. I cant tell cause its not fully developed. Check this link http://www.gardenscure.com/420/plant-nursery/107527-revised-complete-guide-sick-plants-ph.html

Hydro isn't my style firstly, but I would have to wager that it is a deficiency and not a nutrient burn if only water and no nutrients have been provided for a week. Based on the first leaf picture it looks like a phosphorous deficiency, which would have started on the lower growth and progressed upwards and inwards. As always there could be other issues at play (heat might not be helping); what is your feeding regimen like?

Not one person has even mentioned anything about his Temps and how close he has that uncooled 400 watt HPS. 8"s away is way to close. You are cooking those things.
What kind of water are you useing? What is your PH? What is the grow medium? I would repot them if the roots are growing out the bottom and dieing. If you are carefull and easy on your plants and roots while repotting them, they will not even droop or anything. More information is needed. With out it, we might as well write problems on the wall and throw darts to see which one it might be. But i am pretty sure, heat is one of your problems. You should be taking the temp from 8" away from that bulb.

I cant raise the the light any more..I am using a scrog because of my height problem...The first thing I thought it was was nute burn..Which is why I started using only water...Second I thought I was the light to close..But the plant that is showing stress is not the plant directly under the light..Its about 10-12 inches away from the bulb. The plant directly under the bulb looks fine and is growing nicely with small signs of heat stress(leaves pointing up) I have been concerned about the temps and got it down to the 80's with a few fans.. The burns started when I gave them there first dose of full nutes with holland secret..

I am using 4in. rockwool cubes in 3 gallon buckets filled with hydroton ..Ph is steady around 5.5-6.0 I am using the ph drip tester which is why I am not totally accurate.
But like I said earlier there are 3 plants and only one(LSD) is showing these burns.

'Preciate the replys so far.

bumppppppp

looks like classic Potassium deficiency (K)

Kerovan said:

looks like classic Potassium deficiency (K)

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I just googled some Potassium deficiency photos and they do look similar thanks man.

Nunotmp said:

I have 3 plants in 4 1/2 week of 12/12 and his lsd is showing signs of burn it looks like?
I am flowering with a 400w hps and using holland secret nutes....Temps stay in the mid to high 80's and the hps is about 8 inches away and the reflector is not air cooled.


About a week ago I noticed the tips were getting crispy so I topped off my res with fresh water and no nutes for the whole week..

There are 3 plants in a scrog and only the lsd is showing these burns..It is also the biggest. Could this be a sign of root rot? The roots have been showing on the bottom of my pots for about 4 weeks now but the ones that show soon die...

View attachment 1344933View attachment 1344934View attachment 1344935

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good chance of K def. usually biggest one can get K def. get some 13-14 flowering nutes . If it is K then plant is open to disease, bugs etc.
In case its light burn , move it up to 18", 8 is too close.

Are you using flowering nutrients? NPK ratio on most flowering nutrients are usually .5-1-1 or 15-30-30. Phosphorus and potassium are what your going for, but some nitrogen is necessary.

Yea I am using the bloom nutes

I couldn't raise my light so I lowered my table 4 in...

Nullis said:

Hydro isn't my style firstly, but I would have to wager that it is a deficiency and not a nutrient burn if only water and no nutrients have been provided for a week. Based on the first leaf picture it looks like a phosphorous deficiency, which would have started on the lower growth and progressed upwards and inwards. As always there could be other issues at play (heat might not be helping); what is your feeding regimen like?

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I say phosphorous because the necrotic patches are not confined to the leaf margins as I would expect to see in the case of a potassium deficiency. For all I know the plant may be exhibiting symptoms of multiple deficiencies and it may also be under stress. But, because you say you topped off and no nutes for a week it would seem unlikely to be caused be over-feeding (that is, if the problem only had gotten worse during that period). If it is still getting worse and you are still not feeding or barely so then you can be sure it isn't from nutrient burn.

But, what's the status now anyways? Either way you're going to have to start giving nutrients in some capacity to possibly correct the problem or at least prevent more from occurring. Begin with half of what you used before or something, if nothing gets worse then gradually increase that to 1.5x what you were giving before and pay close attention.

If you had an EC/TDS meter it might really help as others could probably inform you quite easily if your solutions are too strong.

Also, I am an advocate for foliar feeding which might really help you at this point. You could mix up a solution of bloom fertilizer (1/4 - 1/8 strength) and use a spray bottle that puts out a fine mist to spray the mid-lower foliage (tops and bottoms) before the lights go out and/or before they turn on. The plant can absorb nutrients through its leaves faster than the roots, so doing this can remedy a deficiency quicker than fertigating.

I gave them 1/2 strength nutes yesterday and raised the light about 4in...So the cola closest to the bulb is 12" all others are 12in+..The problem doesnt seem to be getting worse but I guess I will see when lights go back on...Other than that the buds are doing fine..Here are a few shots taken earlier today.

You will have to wait for new growth and/or observe the undamaged leaves. Nothing that has already happened will be reversed.

*BUDS said:

good chance of K def. usually biggest one can get K def. get some 13-14 flowering nutes . If it is K then plant is open to disease, bugs etc.
In case its light burn , move it up to 18", 8 is too close.

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Thanks man..Im guessing its K def. because it has spots on the leaves..I was holding back nutes..It seems to be getting a little worse now so I am gonna bump up the nutes

What should I do with the damaged leaves? Cut em or just keep em

Other deficiencies also cause spots on the leaves (necrosis), though, and where exactly necrotic patches are needs to be considered along with other symptoms and where they initially exhibit themselves. A potassium deficiency should show with necrosis along leaf margins (in your pictures they are all over the place), as well as small leaves. The veins of the leaves remain green with 'mottled' patches of red and yellow between them. Stems and petioles (leaf stems) turn red. Potassium deficient plants also tend to be taller than usual.

Phosphorous def will present with red stems/petioles also, dull purplish hues to the leaves (which curl downwards). P deficient plants may also have small leaves.

Both P and K deficiencies will occur in the older growth, because these elements are mobile and are being moved to support new growth. If the leaves very easily detach themselves then they're toast, otherwise I would say leave them because there might still be nutrients there the plant can extract.

Nunotmp said:

What should I do with the damaged leaves? Cut em or just keep em

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as long as they still have some green I would leave them. They are still producing some vital energy for the plants, just not as much as a good leaf would.