Active biochemical profile and physiological mechanism
- Active ingredient: Alpha Naphthyl Acetic Acid (NAA) 4.5% SL (synthetic auxin phytohormone).
- Mode of action: Delays the formation of the abscission zone at the pedicel base, preventing premature flower and fruit shedding.
- Cellular elongation: Stimulates cell elongation, cambium division, and vascular bundle development in young reproductive organs.
- Auxin balance: Counteracts endogenous ethylene and abscisic acid (ABA) surges triggered by heat, drought, or cloudy weather.
Crop indications and critical application windows
- Cotton: Applied at square formation and flowering to arrest square, flower, and young boll dropping.
- Chilli: Prevents massive flower drop caused by extreme summer temperatures, significantly increasing pod set.
- Tomato and Brinjal: Enhances flower retention, fruit set percentage, and uniform early fruit sizing.
- Mango and Citrus: Reduces fruit drop during pea-stage and marble-stage fruit development.
- Grapes: Applied to loosen clusters and promote uniform berry enlargement.
Dosage discipline, spray calibration, and precautions
- Micro-dosage requirement: Requires exact dilution (typically 1 ml per 4.5 litres of clean water or 40 to 45 ml per 200 litres per acre).
- Overdose warning: Applying higher than recommended doses acts as a herbicide or fruit-thinning agent; adhere strictly to label guidelines.
- Spraying conditions: Apply during early morning or evening hours when leaves are turgid; avoid spraying under intense afternoon sun.
- Water quality: Use clean, neutral-pH water; do not mix with copper-based chemicals or strong alkaline sprays.
Official source
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Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What is Planofix and what does it contain?
Planofix is a plant growth regulator containing Alpha Naphthyl Acetic Acid (NAA 4.5% SL), a synthetic auxin.
What is the primary benefit of spraying Planofix?
It stops premature flower, bud, and fruit drop in crops like cotton, chilli, tomato, and mango.
What is the standard dosage of Planofix?
The general dosage is 1 ml per 4 to 5 litres of water; overdosing must be strictly avoided.
What happens if Planofix is overdosed?
Overdosing can cause severe leaf curling, stunted growth, or unwanted flower thinning.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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