Yellow and brown leaves

What is causing this?



Originally we thought it was a calcium deficiency. Here is a link to that thread: https://www.rollitup.org/marijuana-plant-problems/317945-magnesium-deficiency.html

I tried dolomite lime, but the problem seems to be worsening.

PH is 7, Foxfarm Ocean Forest soil, so far only one light feeding of Foxfarm Tiger Bloom and Big Blossom, 12/12 under 600w HPS, temps range low 70F (night) to low/mid 80F (day).

Please help!

Can anyone help pls?

Try this page, it helps me
http://www.greenmanspage.com/guides/plant_abuse.html

Read this:
https://www.rollitup.org/general-marijuana-growing/1469-marijuana-plant-problems-cures.html

You may want to lower your ph to 6.0 and lighten up on the tiger bloom.