Hi casnavy, Welcome to Garden Web. I'd suggest you try asking at the link below. If they can't help, you might also try The Fruit and Orchards Forum. Sue Here is a link that might be useful: Trees Forum

TOO MUCH WATER This is almost alway a problem for us northerners because our trees must be able to take a few days with out watering on our hottest days. Here is what I do that works wonders and makes it possible to leave my tree alone for 4 days in upper 90F weather in the summer.Both tangerine trees are 49 weeks old from seed sprout. I use a shop vac plug into GFI now to protect from water that might drip from pot. My trees are also now permanently place on the vacuum chamber bucket for the cold season 'no setting up necessary". 10 seconds morning 10 seconds evening brings me close to my tree 2 times daily to catch problem while they are small. \vacuum chamber hold pot off cold floor. I mulch the surface to hold down evaporative cooling. A fan will do a fantastic amount to draw moisture from the leaves. This will draw much more on the water in the soil. Works best with leaves on the tree before they drop. Don't change your soil now but wait till spring and use what I am using to get you through the winter.

I'm in Laguna beach California never very cold here Today is 63 I asked at our local nursery and he said the same thing need to water I just fertilized yesterday also It's never had this much fruit which is nice, but there's no new growth anywhere on the tree.Its been in this pot 4-5 years Probably needs to come out and have roots trimmed if I want to leave it in the barrel.

What mix is your tree potted in? How long has it been in that mix. None of my kumquats show deficiencies and I feed them the Peters fertilizer, Oscomote Plus, and FP once in a while. I have no issues whatsoever. I had a tree that I adopted from my neighbor that had been potted in potting soil for a year plus. It showed deficiencies regardless of what I did. A few months ago, I removed all the potting soil and put it in 5-1-1. Although the old leaves are not "corrected", the new growth looks healthy. You may not be able to fully correct those older leaves, but if you start feeding it correctly and put it in a good mix, the new growth may be normal, which a good indicator of the tree's current health. Best of luck!