Pot, Mag or Cal

Let's just assume that ph, roots and what ever else you can think of is good. Let's not worry about if it's soil, hydro or whatever else. I only want to concern ourselves with what it is not what it is from.

Would you say the this is potassium, magnesium or calcium. The problem starts with the older big leaves. There's no yellow growth on bottom of plant. No other symptoms what so ever just the orange/rust colored spots around the edges of the leaves. Other than this everything looks and is growing perfectly.

Also attached is a full grow photo for comparison.

I vote calcium
add amino acids which help with calcium uptake is an option leave it be is another.

Calcium is not mobile in the plant, if its older leaves probably not calcium. See you have yellower veins on the lowers, magnesium is deficient for sure. It could also be accompanied by a K deficiency i guess, seeing its also mobile and you get this at older growth.

I was also thinking not calcium do to no yellow lowers and starting with older.

I was leaning towards k more than mg but it looks a lot like mag as well.

Here are my current nute ppm's for undercurrent/ hpa but was lower in k and mg for first two weeks of flower currently in third week. I'm hoping my new mix with higher k, mg will help, c is higher as well.

K was 20ppm lower, mg was 5ppm lower and mg was 10 lower. Plus for the first two weeks I only added early bloom mix when needed and didn't do a full switch out to the new solution. Since beginning the 3rd week of flowering a three days ago I did a full swap to the new nutes.

Hope it works out, i’m an organic soil type of guy so no calculations for me.

wouldnt a calcium deficiency happen anywhere since it isnt mobile.?

Bernie420 said:

wouldnt a calcium deficiency happen anywhere since it isnt mobile.?

Click to expand...

Yeah actively growing parts. It can happen. If the particular leaf was actively growing when the deficient conditions occured.
But mag just caught my eye.