Active Ingredient Chemistry and Physiological Action
Gibberellic Acid (GA3) acts directly on plant cellular mechanisms that govern growth and elongation.
Key physiological attributes:
- Active ingredient: Gibberellic Acid (GA3) formulated as 40% water-soluble granules (WSG).
- Cellular elongation: Stimulates cell division and cellular expansion by activating enzymes that loosen plant cell walls.
- Cluster elongation: Applied during pre-bloom in grapevines to stretch cluster rachises, preventing tight berry bunching and fungal rots.
- Berry sizing: Promotes rapid berry enlargement after fruit set, delivering uniform, premium-grade table grapes for export.
Target Crops and Commercial Applications
Gibberellic acid is registered under CIBRC guidelines across key commercial fruits and field crops.
Major registered crop uses:
- Table grapes: Elongates clusters, thins excess berries, and dramatically enlarges berry diameter in Thompson Seedless and other varieties.
- Sugarcane: Sprayed during formative stages to lengthen stalk internodes, increasing cane length and total biomass tonnage.
- Hybrid rice seed production: Sprayed during panicle emergence to enhance panicle exertion in female parental lines, improving cross-pollination seed set.
- Citrus and Banana: Improves fruit set, delays rind senescence, and keeps fruit rinds fresh and firm during harvesting.
Dosage Precision and Application Precautions
Because plant growth hormones operate in parts-per-million (PPM) concentrations, exact measurement is mandatory.
Spraying guidelines:
- Precise dilution: Measure strictly according to package instructions using clean, neutral pH water; dissolve completely before spraying.
- Foliar wetting: Use fine mist nozzles or dipping cups (in grapes) to achieve uniform contact without excessive chemical runoff.
- Soil moisture check: Apply only to well-nourished crops with adequate soil moisture and balanced macronutrient fertility.
- Protective equipment: Wear chemical-resistant gloves, safety goggles, and a protective mask during spray tank preparation.
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
Directorate of Plant Protection, Quarantine & Storage ↗Related on KisanPe
Common questions
What is the primary role of Gibberellic Acid 40% WSG in grapes?
It elongates cluster bunches, thins excess berries, and enlarges individual berry size to produce premium-grade table grapes.
How does GA3 benefit sugarcane cultivation?
It stimulates rapid elongation of cane stalk internodes, resulting in longer canes and higher harvest tonnage per acre.
Can GA3 compensate for poor soil fertility or drought?
No, gibberellic acid is a growth stimulant that requires adequate soil moisture and balanced plant nutrients to produce healthy growth.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
More General Agriculture & Tools guides
Ask Sakhi AI in your language, check live mandi prices or plan a loan with KisanPe tools.