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
- Strong cell wall formation and thus for plant and fruit integrity
 - Fruit development, fruit quality
 - Prevention of Blossom End Rot, a physiological disorder, and promotion of plant health