Production of higher yield comes from controlling the number of grape bunches and size of grape berries. Even berry size is highly desirable to ensure even grape maturity in order to maximize production per area. Physical or nutritional crop manipulation is important to ensure even berry size and consistent maturity to meet market specifications.
Calcium is important for early crop development and healthy growth, leading to high grape crop yields.
Magnesium is needed to maintain photosynthesis and the synthesis of proteins required for high yields.
Of the micronutrients, boron and zinc are the most important for fruit set and final yield in table grapes, and need to be available at higher quantities than other nutrients.
Iron and to a lesser extent manganese, are important for early leaf production and photosynthesis to ensure better berry development and table grape yield.