Perennial fruit crops have deep root systems which can bring in nutrients from a large volume of soil. Because the perennials can store nutrients in the fall and reuse them again and again during later growing seasons, perennials do not need as much fertilizer as annuals. An annual plant's whole life is dedicated to setting as much seed as possible and sacrifices the entire plant at the end of the growing season. A perennial plant's goal is to make it to next year and the years beyond and set seed in the years it can. Different goals and different strategies.
Growers seem to worry most about if they are putting on enough fertilizer.
They believe that if they put on just another hundred pounds of this or added some foliar nutrient mixture that their yields would increase. Please believe me when I tell you that you can put on too much fertilizer and it isn't always just a waste of money when you do. Too much nitrogen fertilizer results in excess vegetative growth and reduces the reproductive growth which we need to maintain large yields of fruit. In apples, excess nitrogen can result in soft fruit with poor color. In grapes, it will delay ripening.