Auxin hormonal mechanism and abscission prevention
NAA functions as a synthetic analogue of natural plant indole-3-acetic acid (IAA), regulating cellular expansion and tissue maturation.
- Inhibits formation of the abscission zone at the base of flower pedicels and fruit stalks, preventing premature shedding.
- Enhances fertilization and fruit setting percentage during high temperature or moisture stress.
- Promotes uniform fruit sizing and improves fruit firmness in commercial horticulture.
- Soluble liquid (4.5% SL) formulation: Readily dilutes in water for low-dose foliar misting.
Target crops and optimal application windows
Applying NAA during specific reproductive growth stages yields substantial yield improvements.
- Chilli and Tomato: Apply at flower initiation and repeat 20 days later to reduce flower drop and enhance fruit set.
- Cotton: Spray during square formation and early boll setting to prevent boll shedding caused by environmental stress.
- Mango and Citrus: Apply during fruitlet pea-stage to prevent post-bloom fruit drop.
- Pineapple and Grapes: Enhances uniform fruit sizing and berry elongation.
Accurate dosage calibration and overdose precautions
Because plant growth regulators are biologically active at minute concentrations (typically measured in parts per million or millilitres per large drum of water), farmers must measure dosages precisely. Overdosing with NAA can induce severe leaf curling, epinasty, vegetative stunting, or unwanted fruit thinning. Applicators should wear protective rubber gloves and eye protection.
Official source
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Central Insecticides Board and Registration Committee ↗Related on KisanPe
Common questions
What is Naphthalene Acetic Acid used for in agriculture?
NAA is a synthetic auxin used to prevent flower and fruit drop, improve fruit set, and stimulate root development.
How does NAA stop premature fruit shedding?
It prevents the development of an abscission layer of cells at the fruit stalk base, keeping developing fruits firmly attached to the branch.
What happens if NAA is applied at an excessively high dose?
Overdosing can cause leaf distortion, downward curling (epinasty), crop stunting, and accidental fruit drop.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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