Serious leaf issues - deficiency, pH, overwatering?! Please help!

Hi Folks

Please note I am unable to provide photos - no phone at the moment.

Growing in 18L pots in 80/20 coco perlite under 600w hps,
area temps range from 16-21 in veg and 19-26 in flower (celsius)
Water every second day regardless of how wet/dry the coco is, to at least 20% run off, often much more then that.

Feeds have been very weak at 0.6-0.8 EC as I thought that adding a heavier feed would only make existing issues worse - this may be where I have gone wrong.

Recently repotted some of my 2L up into these 18L pots and begun experiencing severe leaf issues - the problem seems to be present in both veg and flower rooms and I'm unsure why - been pH'ing water ranging between 5.8-6.2

A description of the problem:
- Bright yellow new growth which gets slightly greener toward the end of the leaf
- leaf veins extremely closely packed together, the leaf itself isn't smooth, very dry and crispy
- After some time it appears that salt crystals (?) begin to precipitate on the leaf surface, which is followed by the leaf veins browning/dying off from the base of the leaf, this continues until the leaf completely dries up and loses all color, appearing a browny/grey, this progressively gets worse up the plants
- leaf cupping, the ends of the leaves are dying off in some cases
- Fan leaves develop uniform looking spots near the end of the leaf vein


Since the problem is continuing after repotting I assume it isn't because of root binding, pH issues and some sort of lockout seem the most obvious but my pH has been consistent?

I am relatively experienced but am absolutely lost as to whats wrong here.

Help needed urgently!

Thanks



Have been consistently

Rootbound in Coco is a good thing.



Before the repotting.
Not feeding often enough.

Are they in veg?

TintEastwood said:

Are they in veg?

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Some in Veg,

Some in flower.. Same symptoms showing in both.

Why would not feeding enough cause weird things like the leaf vein browning off?

I have tried flushing the shit out of them multiple times, now it seems like water is being actively pulled from the leaves.

To my knowledge, and of course this is shooting in the dark with no pics, coco should be fed “ DAILY “. It’s pretty much growing hydroponically in soil. So if I had to take a guess, I would say they are hungry. I also didn’t hear you mention the use of calmag, which is a must anytime I use coco. And how is your rh levels?

Dontjudgeme said:

To my knowledge, and of course this is shooting in the dark with no pics, coco should be fed “ DAILY “. It’s pretty much growing hydroponically in soil. So if I had to take a guess, I would say they are hungry. I also didn’t hear you mention the use of calmag, which is a must anytime I use coco. And how is your rh levels?

Click to expand...

Cal mag is included within the nutrient line I use.

RH about 50-70

Reason I slowed down the watering was cause I thought that I may have been overwatering and suffocating the roots - honestly I've gone through about 1000 possible scenarios and nothing seems to be fixing it.

What exactly are you feeding?

Dontjudgeme said:

What exactly are you feeding?

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Do you mean N : P : K? or nutrient brand? If you mean nutrient brand I'm using Nutrifield, not so well known product line out of Aus - have used this multiple times with no issues what so ever...

Bump

Pics would help

Could be excess K.

I learn more with every run.
Still making mistakes along the way.

Hope your grow improves.