AK47 Plant has yellow and browned leaf.

Hello all,

Read the nutrient guide at https://www.rollitup.org/marijuana-plant-problems/488004-guide-nutrient-deficiency-toxicity.html and am guessing I have a Nitrogen or Potassium defiency.

AK47 feminized (5 plants, only my largest plant is showing this)
27 days since germination and about 20days in 18/6
Promix BX
Watered with filtered water when Promix is dry and 10% recommend dose of All-Purpose nutrients (24-8-16)
Indoor grow tent with 1 90W UFO LED and 2 42W (100W equal) CFLs at 6500k

This browning an yellowing came out of no where as 3 days ago there were no issues, so I am hoping to nip this in the bud

Should Increase nutes to 15% or more or give them another dry out period and give a full serving of nutes?

Any pointers appreciated.

Hate to bump this but things look far worse today. Will put some more pictures up after work.

Any pointers or consensus on my thoughts are appreciated.

man I grew this one time and got some excellent results. However I only gave them nutes 1 time before 12/12. What I did get was some yellowing from overwatering and all I did was cut back on water. If its isolated I would just give it a cup of water and monitor it. If it keeps going It could be a nute problem but IDK.

do u have enough air circulation in there?

Yeah, I have an inline fan that runs for 30mins every hour so I don't think air circulation is an issue.

Its a hard call because if it needs nutes and i stop them things will get worse. If it has too many nutes and I give it more things will get worse. Might just have to flip a coin and hope for the best.

you can never go wrong with just watering them.

reason I ask about circulation is because a recent grow was getting curled and yellow leaves due to heat. I had to increase air movement between the canope and lights and this solved that issue.

if new growth is green as can be then you should b ok. if the yellowing is at the top then u should b a little concerned

Cool thanks bantos. Maybe will give them a feeding of water for a bit and see if it cures the yellowing. Props.