I have recently added deep-watering stakes to my eight stone-fruit trees, most of which are about three years old and have not been consistently fruitful. The irrigation system shrubblers go right into the deep-watering stakes. The trees are watered twice a week when there is no rain.

It is time for the February feeding with fruit tree fertilizer granules, but I don't know
a) whether I should drop into the watering stakes THE SAME AMOUNT that I would normally sprinkle around each tree, and
b) whether it should be dropped in ALL AT ONCE or if this will clog the stakes.
c) whether I should immediately follow the granules with WATER POURED INTO THE STAKES to activate the feeding process. Is it best to do this by hose (stronger flow) or by manually running the sprinkler system (weaker flow)?
(It is raining about once a week now so I have turned off the automatic running of the sprinkler system. The stakes are capped, so rainwater does not get in.)

I would appreciate any advice. Thanks.