Ethos Banana Hammock comparative(exodus thread)

Phosphorus was blocking out N, the lighter lower leaves. If it progresses and further, it will lock out K, throw a K def, and then you'll start overfeeding K, which blocks Ca, Mg, and Fe. It'll just keep you casing. I see it a lot with folks using bloom boosters.

Anyhow, course of action?
Wanna take a look at my plants individually later and see if you can help me diagnose and fix (hopefully) minor issues?

I mean my plants aren’t dead and they grow bud. 4 of them take up a 4x4 tent.... probably could do something special if I tried....
 
Wanna take a look at my plants individually later and see if you can help me diagnose and fix (hopefully) minor issues?

I mean my plants aren’t dead and they grow bud. 4 of them take up a 4x4 tent.... probably could do something special if I tried....

Sure post them up. We can all walk through it, if everybody is game.

I'll do this walk through quick.
 
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Ok. From here, you can see the yellowing lower leaves. However, notive their overall health. No tip burn or curl anywhere on the plant that would indicate K def. The leaves are all healthy and standing at attention. With K def, it affects the stomata, which is why you get that curl like wind burn or overwatering, if you've seen that. K tox will ghost your tips. They'll start out as an ashy gray and move to a brown burn. The gray is subtle, but it's there if you look.

We know it's not N because the color variations. N tox would cause the entire leaf to be dark green and the tips would take a bow. It's a bow because at least you didn't go too far and roast them. They recover in that state. It could be N def, but no other symptoms suggest anything of the nature.

If it were P def, there would be splotches on the mid and lower leaves from the breakdown. The leaves would become weak and waffly, if that's a word. Since it's P tox, there is an over abundance of stored energy for the plant which is responsible for the dark green edges. Progression of this tox will lock out K next and lead to K, Ca, Mg, and Fe deficiencies.
 
I still dont understand why the guides said blue leaves were a sign of def and not tox

With K tox, you'll get a curl and a burn. Just before that burn, the leaves are that dark blue. The reason is, K controls the stomata. When K is lacking, it can't control the stomata right and you get a buildup of ATP/energy from the photosynthesis. That buildup is the same buildup you see in my pics, same blue you'll get with K def. It's a buildup of stored energy. If the plant can't transpire right, it can't burn stored energy.
 
The blue/purple/green is symptomatic of excess stored energy. There can be multiple causes. Anything that alters photosynthesis, respiration, or transpiration can cause this buildup.
 
VPD can cause it as well. In this case, it was the lack of symptoms that made it very easy to diagnose. The yellowing lower leaves just indicates N is being slightly locked out.

It's not a K issue though, at least not the root of it.
 
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