What kind or strenght does the fertilizer is? Because, if it is the one I use...
it would be too much...
Well, about watering... depends on the season you're, because when it's summer (I understand) you should water it more than in winter, and so on... It also depends on the place you have it, the size of the pot, the needs of the tree... so the best idea is to measure the moist level of the soil with a chopstick, I think you should see all the
FAQ about watering... and of course the ones about fertilizing...
Luck!!!