Nutrient Burn VS Potassium Deficiency

I'm busy trialing out some supersoil from a local company, they warned me it may be a bit hot so I must keep an eye out.

About a week ago I started seeing burnt tips, I immediately assumed that this was the burn he mentioned possible.

However, I'm starting to lean more towards a potassium deficiency based on the extent the "burn" that is present on the leaves. The yellowing or lightening just on the inside of the "burned" areas are also making me lean Potassium.

Hoping for a second opinion, obviously the resolution would screw me over if I got it wrong.

It does look like it is not getting enough. Ph of the soil and what you water with could be causing it. At that size I dont think the soil is lacking in K.

ComfortCreator said:

It does look like it is not getting enough. Ph of the soil and what you water with could be causing it. At that size I dont think the soil is lacking in K.

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They asked me to test it by running it with water only (no nutes), as that is how they want to market the soil, there are 6 plants all around this size with 2 now starting to show this. I have some other cuts in my regular soil with the same pH and watering habits (6.2 to 6.5)

They've been in the soil for about 8 weeks now, I'm thinking it may have depleted the available potassium, as this is the largest of the 6 (just over a meter and a bit) . I suspect the rest may soon follow

trichomechaser420 said:

They asked me to test it by running it with water only (no nutes), as that is how they want to market the soil, there are 6 plants all around this size with 2 now starting to show this. I have some other cuts in my regular soil with the same pH and watering habits (6.2 to 6.5)

They've been in the soil for about 8 weeks now, I'm thinking it may have depleted the available potassium, as this is the largest of the 6 (just over a meter and a bit) . I suspect the rest may soon follow

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im leaning on the side of depleted soil myself. Give her a couple doses of your regular feeding an see what happens. IMO its either a lack of K or mag but that does not mean its not in the soil. I'd give her a couple doses of full balanced food to see what happens.

Thanks. I gave them some magnesium and potassium, so hopefully something comes right and hopefully it's not just a case of nutrient Burn.

Looking a bit like mg + k problems to me.

Not sure if these images will change any thoughts or make any guesses easier.

You are pHing your water?

SnidleyBluntash said:

You are pHing your water?

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Yup, pH always at between 6 and 6.5. I'll check the run off again but last time was sitting at 6.2 soil pH

Find out from the company what exactly is in the soil. If they are advertising it as a "hot" super soil, I doubt they'd skimp on the potassium unless it was a mistake. Have you done a slurry ph test?

Rurumo said:

Find out from the company what exactly is in the soil. If they are advertising it as a "hot" super soil, I doubt they'd skimp on the potassium unless it was a mistake. Have you done a slurry ph test?

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I have done a slurry pH test and it was at pH 6. I'll reach out to the company on Monday.

I haven't been on top of my epsom salts so mg deficiency seems very likely, but it's even appearing on a few leaves without any lightening between the veins

In my opinion. It’s the pH downing that’s causing this. What is the tap water starting pH, and what is the pH of it after you add nutes? I had the exact same problem, I believe it was from too acidic, locking out potassium. But that’s a big debate: pH in soil or not.

SnidleyBluntash said:

In my opinion. It’s the pH downing that’s causing this. What is the tap water starting pH, and what is the pH of it after you add nutes? I had the exact same problem, I believe it was from too acidic, locking out potassium. But that’s a big debate: pH in soil or not.

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My tap water is 8.5 out the tap, I then bring it down to around 6 to 6.5 before watering. The symptoms definitely fit but I can't think of how when the water going in and coming out are within a decent range, and there's been nothing added that should cause a lockout

Whatever it is, is progressing fast and looks like a lost run at this point. The plants were all looking perfectly healthy 10 days ago, but it's progressing rapidly.

Soil company?? Also I agree with snidleybluntash

SnidleyBluntash said:

In my opinion. It’s the pH downing that’s causing this. What is the tap water starting pH, and what is the pH of it after you add nutes? I had the exact same problem, I believe it was from too acidic, locking out potassium. But that’s a big debate: pH in soil or not.

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Adding most ph down products destroys life in soil. That life isn't what makes nutrients available. That microbe life can regulate its own ph! If your water is 8.5 than adding ph down Probable would Be my last option. When I hear about these high ph tap waters it usually is a problem with the water from the start. Changing ph of shit doesn't changed it to roses.

https://www.growweedeasy.com/what-causes-flowering-stage-nutrient-deficiencies try this and see what you think. How is your run off?

give them a BALANCED DIET of npk+secondary + micro nutes. Forget about what used to be in the soil or even what caused it at this point. She needs food badly. she is not "nute burnt" shes starving. Do this right away. A good way to test my theory is to feed with water only....if im right then it will take forever to dry up .....if you feed with a full dose of food then she will eat it all in 2 days or less.....
Ps. dont test anything , just feed her!

getogrow said:

give them a BALANCED DIET of npk+secondary + micro nutes. Forget about what used to be in the soil or even what caused it at this point. She needs food badly. she is not "nute burnt" shes starving. Do this right away. A good way to test my theory is to feed with water only....if im right then it will take forever to dry up .....if you feed with a full dose of food then she will eat it all in 2 days or less.....
Ps. dont test anything , just feed her!

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For future reference, that picture posted is of a plant with severe nute burn. It was probably in soil which was already on the hot side, and the added epsom salts burned it

If you're ever in any doubt about whether a plant is over or under fed, the only thing to do is to flush it through with a 1.0EC strength feed of base nutrient until what comes out the bottom reads no higher than 1.2

DukeFluke said:

For future reference, that picture posted is of a plant with severe nute burn. It was probably in soil which was already on the hot side, and the added epsom salts burned it

If you're ever in any doubt about whether a plant is over or under fed, the only thing to do is to flush it through with a 1.0EC strength feed of base nutrient until what comes out the bottom reads no higher than 1.2

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i have no idea how i called that as starving. i must of thought i was on another thread. She is overwatered/"burnt" up badly. My opinion is that the soil is soaked and the only way to get her to drink is to repot her into dry soil. you can try a 1.0ec flush , thats about all you can do with her.

is it litterally impossible for ph to fix this problem.