I'm sure someone will chime in that knows more than me but I have never done much for my grapes besides a bit of watering in the most serious of droughts and that was after serious leaf droop....and the drought years brought the best grapes.
I believe once grapes are established they don't really need anything as fertilizers stimulate leaf and stem growth but slow down the fruit.
I've had bumper crops by doing pretty much nothing.
Let's hope someone else repsonds.
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Brian
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