Aarrgh!

Never fertilize newly potted trees; they can't utilize the nutrients until the roots mend, and it can cause soil troubles just sitting about (slime molds and that sort of thing). Please read my article on potting trees...
[url]https://www.helpfulgardener.com/bonsai/03/soil.html[/url]
Big Daddy offers good advice. The old saying is "as with the bottom so woth the top." Prune a third of the roots, prune a third off the top. Prune half the roots, prune half the top. Opa's soaking idea is good once you have settled your new soil in for a week or so with regular top watering, but it will float new soil, so best to wait...Keep the soil moist, not damp. Hopefully we can rinse out the fertilizer some by watering three times every time. Here's some watering tips...
[url]https://www.helpfulgardener.com/bonsai/03/care.html[/url]
Scott