Fletch

Short answer... Hell Yes! and anyone who tells you otherwise is a liar or a fool.

In fact, being in a confined environment like a pot makes root burn from fertilizer even more likely if misapplied, no matter what the source. Also, as you mentioned, organic source fertilizer adds the complication that the decomposition process first uses nitrogen from your soil before the organic matter breaks down into a form readily absorbed by your trees. So in effect over fertilizing could first starve and then burn your trees, a very nasty double whammy.

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Advice worth every penny you paid for it.

Regards
Fletch