1. Base Fertilization (Autumn / Before Growth)
Period: October – November
Fertilizer Type: Granular NPK (e.g. 15-15-15 or 20-10-10) with sulfur and potassium
Dosage: 40–60 kg/acre
Purpose: Replenish nutrients after harvest and support the root system.
2. First Nitrogen Fertilization (Before Bud Break)
Period: February – March
Fertilizer Type: Ammonium nitrogen or urea (stabilized form preferred)
Dosage: 15–20 kg/acre
Purpose: Support new vegetative growth and formation of healthy foliage.
3. Fruit Set and Berry Development
Period: April – May
Fertilizer Type: Nitrogen form with potassium (e.g. ammonium nitrate + potassium sulfate)
Dosage: 10–15 kg/acre
Purpose: Enhance fruiting and berry quality.
4. Final Stage – Ripening
Period: June – July
Fertilizer Type: High potassium (e.g. 0-0-50 or potassium sulfate)
Dosage: 10–15 kg/acre
Purpose: Improve flavor, color, and sugar accumulation in grapes.
Supplementary Foliar Nutrition
- Water-soluble NPK fertilizers (e.g. 20-20-20)
- Trace elements (Boron, Magnesium, Zinc, Iron)
- Applications via foliar sprays at critical growth and stress stages
Tips:
- The correct balance of potassium is critical for fruit quality and stress tolerance.
- Boron (B) is essential for fertilization and berry development.
- Regular analysis of soil and leaves is recommended for optimal management.
- Avoid excessive nitrogen rates toward the end of the growing season to prevent reduced ripening.