Those plants are potassium deficient- probably locked out.
Flush and make sure you are giving enough K and that the pH is around 6.7. There shouldn't be a problem if your soil pH is correct and you do not have excess ferts in there.
Don't do it by ppms; do it by plant appearance. They all feed at different rates.
stinkyattic Reviewed by stinkyattic on . nutrient def??? Hello good peeps. I am troubleshooting what i think is a calcium deficiency. I think the cause of this is because i have not been adding calmag to the girls. I am in soil in 4 G pots. I have well water that is at 120-130 ppm. I am running Botanicare pro bloom soil, Karma, and sweet. They are about 3 weeks into bloom and this is what i am finding. Starting from the lower branches Leaf edges have brown small spots along them. The tips also have turned rusty/brownish on the bottom half Rating: 5