Technical profile and rapid contact mode of action
Paraquat Dichloride provides swift foliage desiccation through a specialized light-dependent pathway (HRAC Group 22).
Key technical properties:
- Active composition: Paraquat Dichloride 24% Soluble Liquid (SL).
- Photosystem I electron disruption: Intercepts electrons within chloroplasts, producing toxic hydroxyl and superoxide radicals that destroy cellular lipids.
- Foliar burndown speed: Weeds display visible yellowing, wilting, and complete foliar scorching within 24 to 48 hours under sunny conditions.
- Strictly contact action: Does not translocate into root crowns or woody tree bark, ensuring trunk safety in mature plantations when directed properly.
- Soil immobilization: Becomes biologically inactive upon reaching the soil by binding irreversibly to clay and humus particles.
Dosage per litre guidelines and approved use cases
Dilution and application must follow official CIBRC-approved product labels:
Application parameters and use cases:
- Dilution rate: Standard label rates typically recommend 3.5 to 5 ml per litre of water (approximately 800 to 1000 ml per acre in 200 litres of clean water).
- Tea plantations: Directed post-emergence spray between crop rows using hooded nozzles to protect green tea foliage.
- Zero-tillage land prep: Clearing mixed standing weed flushes prior to direct drilling of rice or wheat.
- Aquatic weed clearing: Managing floating weeds like Eichhornia in non-potable agricultural drainage channels.
- Nozzle recommendation: Use flat-fan or flood-jet nozzles operated at low pressure to minimize fine mist and spray drift.
Strict operator safety and emergency precautions
Paraquat is classified as a highly toxic chemical. Spray operators must wear complete PPE including a face shield or goggles, chemical-resistant nitrile gloves, rubber boots, and a certified vapor respirator. Never spray against the wind or using leaking equipment. Store strictly in original locked containers away from children, food, and animals, and seek immediate medical care if accidental exposure occurs.
Official source
Check the latest rules, benefits and forms here. KisanPe is an independent platform and is not a government website.
Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What is the typical dosage per litre for Paraquat Dichloride 24% SL?
The approved label dosage is typically 3.5 ml to 5 ml per litre of water, adjusted according to weed density and height.
Why must Paraquat Dichloride be sprayed with a hooded nozzle?
Because it is non-selective, a protective spray hood prevents chemical drift from contacting and injuring cultivated crops.
Does Paraquat leave toxic chemical residues in agricultural soil?
No, Paraquat is bound tightly and permanently to clay and organic soil particles, becoming biologically inactive immediately upon soil contact.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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