Hey Tassie, I think it is a valid point that there may be roots reaching saline soil in the ground where the pots rest.
I don't think it is that though. I think you have yellowing leaves from water deprivation and the burnt leaf edges looks like a Potassium ask to me. Here is a blog on how to fix a Potassium deficiency. Incidentally, I think that this was also caused by a lockout due to unintentional droughting.
Leaves with a potassium deficiency have yellow, brown, or burnt edges and tips. It may look like nutrient burn, but the leaf margins also turn yellow.
www.growweedeasy.com