lime, why do you have two threads on the same topic? Just post one message, so we can answer you in one message thread.

Patty S.

I didn't know how to put more than one photo on the post and thought it would be helpful to have more photos. I appologize for any problems it has caused.
Patricia

See my other response to one of your other duplicate messages, Patricia, on how to post multiple photos in one message. If you don't understand how to do that, just ask. I'll explain in more detail. You can also simply reply to your own message, and then add an additional photo in that reply. Otherwise, we don't know which message to go to, to answer your duplicate question :-)

This isn't Mg deficiency. Just an old leaf, and possibly a lesion on another leaf. I think your tree looks fine. If you want another option for fertilizers, many of the container citrus forum members here use Dyna Gro's Foliage Pro in combination with Osmocote Plus (must be the "Plus" formulation) and get excellent results. They apply Foliage Pro full strength with every watering during the growing season. When they bring in their trees for the winter, they will cut down to 1/2 strength with every watering. And, apply Osmocote Plus twice a year. But, if you're getting good results with your current fertilizer, I would just continue to do what you're doing. Your tree looks fine to me.

Patty S.