Thank you all for your input and advice. And sorry for the suspense - I couldn't find the camera cord. And another apology - I said "soil", but should've said "mix": I've got them growing in metro-mix 830 (peat, composted bark, perlite, vermiculite, dolomite lime, and blue chip). Below are links to the pics of the trees as they live in their environment. I posted links rather than the pics themselves so that I could keep the images large enough to show as much detail as possible. Houstontexas123 thanks for that link. After comparing mine I would say it looks like their iron-deficient leaves look most like mine, but again, when it comes down to it, I can't say that any of them look anything like mine. After reading your generous comments above, and reading the back of the metro-mix bag (where it recommends a constant application of fertilizer after at most the third watering), and contemplating my own ignorance, I'm pretty much coming to the conclusion that my poor citrus are deficient in probably pretty much just about everything. Heh. I guess what took me so long to wake up was that it took me so long to hit bottom. My Meyer is six or seven years old now, and has been producing happily and abundantly in the same pot until only last year without aid of any more than a general granulated house plant fertilizer that I put in the water when I brought them in for the winter. : you can see the newer growth is even yellower than the old growth (you should be able to enlarge the images by clicking them if they don't automatically fill your brower). : older growth is yellowing out and dropping off. You can see a few fruit, also sadly yellowish. : newer growth yellower than old as well. I looked around the internet and town good and long for Vigoro citrus and avocado fertilizer but couldn't seem to find anyone who was selling it or could order it, so I picked up a box of Dr. Earth's Fruit Tree Fertilizer. It lists citrus as a primary use, so ought to address my flagrant nutrientlessness. It's quick-release too, so hopefully I'll see some results soon.

Thanks! Now I only need to figure out how to get rid of this problem!!

If you are certain you are not overwatering, then I would continue to feed them. My sister had a set up like yours, continual drip, and lost them to rot...Older leaves yellowed up and then the whole thing.. It is a myth that citrus do not require fertilizer in the winter.. In the ground, everyday, they are constanly being nourished from organic material.. As rhizzo suggested, if they are in a container,continue to fertilize..They starve rather quickly if fertilizer is withheld, even through the winter. They are piglets for food, no matter what... I never stop, and mine do fine here in New England...:-) It takes about a month of two when I start to notice the symptoms you described if it is caused from lack of fertilzer, and no sign of root rot Do you happen to know the PH of your water? If it is a ph problem, that can be corrected very quickly... Goodluck, Mike:-)

Looks like your trees might be suffering from some bark disease. You need to remove the landscape rock from near the trunk out a couple feet, it could be trapping unneeded moisture too close to the trunk and be causing that bark splitting. Can you take a close up of the trunk on both trees and post the photos? The one leafless branch on the upper photo looks like it's had twig die back, trim it back to where the branch looks green which could be at the node where it grew from. What is your grow zone? How often do you water and fertilize? Evan