N and K deficiency?

Hi my brothers and sister's .
I have some deficiency but not sure what it is, looks like N or K, what do you thinking?.
and way are my top buds charging cooler to purple?


Seed: OG.Kush Auto from Fast Buds.
(week 3-4 in flower)
Im using fabric pots (25L) and for the feeding I use livingsoil Auto Bloom (first time using dry nutes and the brand so I don't know what to expect).
Water when dry at 6.3-6.7 ph.
I feed her 1 time a week, the lights are about 30cm from the top.

Lockout is my guess.

PadawanWarrior said:

Lockout is my guess.

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I haven't even thought about lockout , I will by Epson salt for the lockout problem.
Thanks alot I really appreciate it.

Minbebistillmax said:

I haven't even thought about lockout , I will by Epson salt for the lockout problem.
Thanks alot I really appreciate it.

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What? How do you come to this conclusion? Or remedy? I’m doubting lockout. I see magnesium deficiency and possibly potassium deficiency. Foliar feed the Epsom salt 1 tablespoon per gallon of water. No idea how you want to address potassium but likely it needs phosphorus as well. In short a good bloom feeding.

What ppms are you feeding them

Father Earth said:

What ppms are you feeding them

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I don't know what the ppm are, I will check it and gonna write it down for you guys thanks!