On the basis of utility, grapes are classified into three groups: Table Grapes, Raisin Grapes and Wine Grapes.
Those grape varieties, which are consumed in fresh form, come under table grape. They have attractive colour and good keeping quality.
These are dried grapes. They should preferably be seedless and should have higher sugar content (20-22 brix), crisp pulp and thin skin.
Grape varieties, which are usedfor wine making, come under this group.
Besides light, temperature, mechanical support, waterand air, these are certain elements which are essential for the normal growth of plants and like all the other higher plants grapevines also require all sixteen essential elements for their growth and development.
Nutrients are taken up primarily by the roots in the form of an aqueous solution in the soil.For healthy growth,a plant requires:
Energy: Light for photosynthesis
Gases: CO2: basic component of organic matter
O2: basic component and catalytic respiration.
- Nitrogen - Phosphorus - Potassium -Calcium - Magnesium -Sulfur
Micro nutrients: Ferrous, Zinc, Copper, Boron, Manganesse, Silicon, Molybdenum, Sodium, Cobalt, Chlorine.