GRAPES
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Phosphorus Deficiency
Pigmentation seen in old leaves; leaf growth rate will be affected
Potassium Deficiency
A dull, dark green color will appear on the leaves. In mid-to late summer, leaves may have a bronze color, especially on the west-facing side of the trellis.
Calcium Deficiency
Growth of the plant is reduced. symptoms are first seen at the growing points of the plant, which may become necrotic and die. .
Manganese Deficiency
Symptoms first appear as interveinal chlorosis, or yellowing of the younger terminal leaves.Applying fertilizer-grade manganese sulfate at 20 to 40 gm per vine, or 100 to 200 kg per acre, depending on vine size and severity of the deficiency.
Magnesium Deficiency
Symptoms of Mg deficiency develop on the older leaves first. Chlorosis (yellowing) appears between the veins of the leaves while the veins remain green.
Zinc Deficiency
Poor fruit set and stunted shots with small, misshapen leaves foliar application of zinc is the most effective method for treating Zn deficiency.
Boron Deficiency
Poor fruit set clusters will tend to be small, and berries will not fully develop on the rachis. Terminal buds may not break in the spring, and ends of shoots sometimes are distorted. Borax or borate, B carriers, can be sprayed on in the spring when needed.
Sulphur Deficiency
Whole orchard or spot-wise stunted growth of pale-green plants.
Iron Deficiency
Leaf veins remain green interveinal portion turns yellow young leaves small but not deformed.
