Help! Hornbeam leaves turning yellow

How often do you fertilize your tree? Hornbeams need to be evenly moist and are real fertilizer hogs.
 
Every 2 weeks. And the soil is evenly moist.
Have removed the fertilizer bags (solid organic fertilizer in tea bags) due to the fact that the tree could be in distress. Was that wrong?
 
Forgot to post an update. It sure was an issue with light. As soon as i have moved it to the location with actual sun, the yellowing disappeared. This has started to showing on my other trees also.
The bigger problem was that trees were infected with spider mites (i think that is what they are called in English language) and i wasn't aware of the issue so i have reacted a bit late.
The result was bunch of really ugly leaves with brown spots and one dead branch (that i loved dearly) on my Acer ginnala. Will sure be more careful and more proactive in the future.
 
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