Is this potassium deficiency?

[Blazeman]

7 lb bags, organic soil, watering as needed (approx 2 times a week), under 1000w HPS lights dimmed to 600w.
I just cant seem to get on top of this. We have flushed twice.

 

[Blazeman]

 

[Blazeman]

 

[Blazeman]

 

[farmersonly]

from what i have seen on google it looks like potassium deficiency.

 

[farmersonly]

pretty cool how different nutrient deficiencies and toxicities can cause such different visual changes to the plant

 

[visajoe1]

looks like magnesium deficiency to me. leave those fan leaves on though next time, they still help the plant

 

[Beachwalker]

Where does the issue start on a plant, at the bottom first? How & what are you feeding? pH & ppm?

 

[MIMedGrower]

Hot acidic soil will do that. What are the runoff numbers?

 

[Blazeman]

just flushed with 6.4 ro water. got 6.5-6.8 out.

 

[growsince79]

View attachment 962039

How close is that light?

 

[Blazeman]

How close is that light?

about 4-5 ft.