Al:
I admit that my knowledge of grapes vines is limited to what I have read and discussions with others that own vineyards. I see that you're on the east coast too (I'm in Maryland).My plan is to start a vineyard in either the spring of 2011 or 2012. The east coast is gaining a lot of attention for producing some excellent wines. The biggest problem we have in my area is vine vigor. A vigorous vine blocks sunlight and needs to be cut back, which is labor intensive. The only time I see the local vineyards using fertilizer is when the vineyard is being established. However, every vineyard, like every garden, is unique. Just try discussing intrarow and interrow spacing. Down here we have people from Penn State and Univ of MD recommending 7 foot spacing between rows and 1 meter spacing between vines. In Bordeaux, they space the vines 1 meter between rows,1 meter between vines, and do all of the canopy management and harvesting with over the row equipment. As usual, I'm getting off topic. I think the worm fertilizer would be an excellent choice. As for how much to use and when, that's up to the individual. I would love to visit your vineyard in NH. It looks amazing.I hope to get up that way some day.
Mike