Citrus > Cold Hardy Citrus

Poncirus nutrient issues

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toehead:
All, I have a rooted Poncirus cutting with some nutrient issues that I am trying to resolve. It's been recently up-potted to a cardboard pot with MG cactus/citrus soil (which seems to be improving the symptoms slightly). Before this it was in sunshine mix #4. It's gotten, in the past, some very mild organic fertilizer in water, with no improvement.  It was last fertilized about a month ago with Jacks Citrus feed and Southern Ag foliar spray, with no improvement in symptoms.

It is currently actively sending out new growth.

The symptoms: New buds start off green, before getting pale/mottled with a very peculiar appearance. The stem also gets paler the longer it grows. Some of the longer shoots are entirely albino. Leaves on these shoots eventually drop off.

I've been watering with rainwater. The plant is currently in a grow closet with  a high-intensity light. It's getting plenty of light.


What should I try next? It doesn't seem to be in distress, but would like to get it greened up. I am sure there is some issue that is preventing mobility of some required nutrient.

Ilya11:
I observed it also under artificial light.   For me it is due to too much infrared radiation that brings overheating.

toehead:
Interesting! I'll turn down the light intensity and duration and see if that helps a bit.

Millet:
I think it also has fertilizer issues.  Organic fertilizers do not work well in container grown trees, as there is not enough micro organisms to brake  down organic fertilizers into a usable forum.  Also, using an excellent fertilizer like Jacks once (a month ago) is also not a proper fertilizer schedule.

toehead:
Yeah, I fertilize my other citrus with every watering (Jacks), following the recommended schedule on the package.

I'm worried about burning this one as it is recently rooted and i've always had poncirus respond strangely to fertilizer (Plus, foliar feeding didn't make any difference). If you all think it'll be fine, I can begin watering this with diluted Jacks as well and see if it helps. 

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