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
Yara recommended fertilizers for Calcium
YaraVita CALTRAC
Grapevines: Two applications of 5 L/ha at a 10 to 14 day interval prior to flowering. Also, repeated applications of 5 L/ha at 10 to 14 day intervals from fruit set e.g. fruit set, bunch closure ( pea sized berries ), start of ripening and two weeks later. Water rate: 200 L/ha. NB Late applications may leave a deposit on berries which may be of significance for table grapes.
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