Precautions for Using Gibberellic Acid (GA3)

  1. GA3 is not a substitute for fertilizers.
    • After applying GA3, accelerated growth of plant tissues and organs increases nutrient and water consumption. Insufficient water or fertilizer may lead to ​yellowing leaves, ​weak plants, and failure to achieve yield goals.
  2. Use appropriate concentrations based on vegetable type and variety.
    • Sensitivity to GA3 varies among vegetable species and cultivars.
    • Excessive concentrations​ may cause:
      • Excessive elongation, thin and fragile stems, pale/yellow leaves.
      • Reduced edible quality, deformities, or plant death.
    • Low concentrations​ may result in insufficient effects.
    • For fruiting vegetables​ (e.g., cucumbers, tomatoes):
      • Focus on spraying flowers and young fruits.
      • Ensure uniform dipping/soaking to avoid uneven growth and deformed fruits.
    • For leafy vegetables:
      • Apply via ​foliar spraying​ across the entire plant.
      • Adjust dosage based on plant size and density.
      • Spray in the early morning or evening (after dew dries) for optimal leaf absorption.
  3. Usage varies by vegetable type and environmental conditions.
    • Short-growth-cycle leafy vegetables: Apply during the ​early growth stage.
    • Long-growth-cycle or bolting-prone vegetables​ (e.g., cabbage, spinach): Apply in the ​late growth stage.
    • Vegetables harvested for flower stalks​ (e.g., broccoli): Apply earlier to promote bolting and branching.
    • Temperature effects:
      • High temperatures: GA3 acts faster but with shorter efficacy.
      • Low temperatures: Slower response but prolonged efficacy.
    • Seasonal adjustments:
      • Winter: Apply earlier in cold conditions.
      • Summer: Apply closer to harvest to maximize benefits.
  4. Mixing with other substances:
    • Compatible: Acidic or neutral fertilizers/pesticides (e.g., urea for enhanced yield).
    • Incompatible: Alkaline substances (e.g., lime, Bordeaux mixture).