Nutrients

N Nitrogen
P Phosphorus
K Potassium
Mg Magnesium
Ca Calcium
B Boron
Fe Iron
Mn Manganese
Zn Zinc

Grapevines - Discolouration

Symptoms
Starting on the tips grapes turn brown and dry out.

Reasons
Calcium deficiency

Grapevines - Discolouration

Symptoms
Low calcium concentrations produce brown discoloration and rotting starting on the tips of grapes. Subsequently grapes dry out.

Reasons
Calcium deficiency (upper row)

Calcium deficiency made worse by

  • Acidic soils
  • Sandy or light soils (leaching)
  • Acid peat soils
  • Soils rich in sodium
  • Soils rich in aluminium
  • Drought conditions
  • Fruit high in nitrogen or potassium
  • Large fruit

Calcium is important for

  • Improved berry quality
  • Reduction of grape stalk necrosis
  • Improved berry firmness and storage potential