Active Ingredient Chemistry and Physiological Action
Mepiquat chloride acts internally to modulate plant hormonal balances that govern excessive plant height.
Key physiological attributes:
- Active ingredient: Mepiquat chloride formulated at 5% AS (aqueous solution) concentration.
- Gibberellin biosynthesis inhibitor: Blocks the ent-kaurene synthase enzyme in early gibberellic acid synthesis, restricting cell elongation.
- Canopy compactness: Reduces main stem internode length, resulting in shorter, sturdier plants with dark green, thickened leaves.
- Assimilation redirection: Channels photosynthetic assimilates away from rank vegetative leaves toward developing squares and bolls.
Target Crop Application and Timing in Cotton
Applying mepiquat chloride at precise growth stages optimizes cotton canopy architecture.
Application timing guidelines:
- First application: Spray at pinhead square or early squaring stage if plants exhibit excessive vegetative vigor due to high nitrogen or rain.
- Second application: Repeat at peak flowering if rank growth continues, keeping inter-row spaces open for airflow and spray penetration.
- Boll retention: Reduces square and young boll drop by ensuring adequate sunlight reaches lower sympodial fruiting branches.
- Harvest efficiency: Compact plant architecture facilitates faster, cleaner manual picking and improves boll opening uniformity.
Dosage Precision and Application Precautions
Because plant regulators alter internal physiology, adherence to approved label rates is critical.
Spraying guidelines:
- Strict label measurement: Follow official package guidelines per acre; avoid overdosing which could result in excessive plant stunting.
- Moisture requirement: Apply only to actively growing crops with adequate soil moisture; never spray cotton suffering from drought stress.
- Protective gear: Wear chemical-resistant rubber 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 mepiquat chloride in cotton farming?
It controls rank vegetative growth, shortens internodes, promotes compact plant canopy, and improves boll retention in cotton.
How does mepiquat chloride alter plant physiology?
It inhibits gibberellic acid synthesis, reducing cell elongation and redirecting nutrients toward squares, flowers, and bolls.
Should mepiquat chloride be sprayed on drought-stressed cotton?
No, growth regulators should never be applied to crops suffering from severe moisture stress or nutrient deficiency.
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.