Growing Grapes in Your Backyard
Given good drainage, grapes are well adapted to a wide range of soils and generally have few nutritional needs. However, in some areas nitrogen, zinc, and potassium may become deficient. If deficiencies do appear applying these nutrients at the right time and in the proper amounts contributes significantly to a successful crop. Table 15.5, linked below, is a simple guide to fertilizer management for grapes.
What about nitrogen? Over-fertilizing with nitrogen can be a problem, whether the nitrogen source is a fertilizer or a leguminous cover crop that fixes nitrogen. Nitrogen fertilizer should be used sparingly on grapes unless a specific deficiency has been diagnosed. Fertilizing with high levels of nitrogen can contribute to excess vegetative vigor in the vines and may reduce fruit set, fruit quality, or both.
How do I apply zinc? If required, zinc can be applied in one of two ways: