Auxin Mode of Action and Abscission Inhibition
Alpha NAA functions as an auxin analogue that mimics endogenous indole-3-acetic acid (IAA). Applied at precise low concentrations, it suppresses the development of an abscission layer at the base of flower pedicels and fruit stalks.
This delayed abscission allows developing flowers and immature fruitlets to remain firmly attached to the plant, increasing final harvest count.
- Prevents flower & fruit drop: Highly effective in chillies, tomatoes, mangoes, citrus, cotton, and pomegranates.
- Pineapple flowering: Induces synchronized flowering and uniform fruit maturity when applied to mature vegetative rosettes.
- Cotton boll retention: Curtails square and young boll shedding during high-temperature or cloudy monsoon stress.
- Fruit sizing: Enhances cell enlargement, resulting in superior fruit weight and market grading.
Precision Dilution and Safe Application Guidelines
Plant growth regulators must be measured with extreme accuracy; excessive concentrations can cause leaf epinasty, burning, or accidental fruit thinning.
Applying during cool morning or evening hours ensures gradual absorption without rapid droplet evaporation.
- Follow label dilution guidelines meticulously, measuring in parts per million (ppm) or milliliters per liter of water.
- Apply using calibrated knapsack sprayers fitted with fine hollow cone nozzles.
- Never apply during extreme midday heat or drought stress to avoid temporary vegetative distortion.
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the primary agricultural use of Alpha Naphthyl Acetic Acid (NAA)?
It is primarily used as a foliar spray to prevent flower and immature fruit drop and enhance fruit retention in vegetables and orchards.
How does Alpha NAA prevent fruit drop in chillies and tomatoes?
It delays the formation of the abscission zone at the flower stalk base, keeping flowers and immature fruitlets firmly attached.
What happens if a farmer sprays an excessive dose of NAA PGR?
High concentrations act as a growth retardant or thinning agent, causing leaf curl, leaf dropping, or stunted vegetative growth.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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