Chemical Class and Auxin-Mediated Mode of Action
Alpha Naphthyl Acetic Acid (NAA) belongs to the synthetic auxin hormone family. In healthy plants, endogenous auxins produced in growing shoots maintain cell division and prevent the formation of an abscission layer at the base of flower stalks and fruit pedicels.
Under physiological stress, high temperatures, or nutritional imbalance, natural auxin levels decline, triggering abscission zone development and flower drop. Applying Planofix replenishes synthetic auxin levels, preventing pedicel abscission and securing flower and fruit attachments.
- Auxin Hormone Activity: Suppresses abscission layer enzyme activation at pedicel junctions.
- Flower & Fruit Retention: Reduces premature shedding of flower buds, cotton squares, and immature fruitlets.
- Soluble Liquid (4.5% SL): Concentrated liquid that blends completely in water for precise micro-dose foliar spraying.
Target Crops and Critical Spray Windows
Planofix is officially registered under CIBRC standards across key agricultural and horticultural crops including cotton, chilli, tomato, mango, and grapes.
In cotton, it prevents square and young boll shedding during high heat; in chilli and tomato, it suppresses flower abortion during flowering flushes; and in mango and citrus, it prevents post-bloom fruitlet drop.
- Cotton Farming: Reduces square and boll drop, leading to higher boll counts per plant.
- Chilli & Vegetables: Promotes profuse flowering and prevents flower drop caused by temperature fluctuations.
- Fruit Orchards: Secures fruitlet retention in mango, citrus, and pomegranate, improving final fruit size.
Application Guidelines and Micro-Dosing Precision
Because Planofix is a potent auxin hormone, precise micro-dosing is critical. The standard recommended dilution rate is 1 ml of Planofix per 4.5 liters of water (producing a concentration of approximately 10 PPM of active NAA).
Never apply Planofix at higher concentrations; excessive auxin concentrations reverse the beneficial effect, acting as a chemical thinning agent or causing leaf curling. Apply during calm morning or late evening hours with adequate soil moisture.
- Micro-Dose Accuracy: Strictly maintain recommended label dilution (typically 1 ml per 4.5 liters of water).
- Overdose Warning: Excessive dosages act as an abscission agent, causing unwanted fruit thinning.
- Spray Timing: Apply at peak flowering and early fruit setting under good soil moisture conditions.
Official source
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Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What is the active technical ingredient in Planofix?
Planofix contains Alpha Naphthyl Acetic Acid (NAA) 4.5% SL (Soluble Liquid), a synthetic auxin plant growth regulator manufactured by Bayer.
How does Planofix prevent flower and fruit drop?
It provides synthetic auxin that inhibits the enzymatic formation of an abscission layer at the base of flower and fruit stalks.
What happens if Planofix is overdosed?
Overdosing Planofix can reverse its retention effect, inducing flower and fruit thinning or leaf curling; always adhere strictly to label micro-dosing.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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