Active Ingredient and Mode of Action
Basagran contains bentazone (480 g/L SL), an active ingredient belonging to the benzothiadiazinone chemical family (HRAC Group 6).
It acts as a Photosystem II (PS II) electron transport inhibitor. Upon foliar absorption, it disrupts the photosynthetic light reaction, generating reactive oxygen species that destroy weed chloroplasts.
- Chemical Group: Benzothiadiazinone selective contact herbicide
- Cellular Action: Blocks electron flow in Photosystem II, inducing chlorosis and necrosis in target weeds
- Crop Safety: Rice plants rapidly detoxify bentazone through natural metabolic hydroxylation and glycosylation
Target Weeds in Paddy Cultivation
Sediment-dwelling sedges and broadleaves compete aggressively with young rice plants for nitrogen and light.
Basagran provides suppression of annual and perennial sedges, including species showing resistance to sulfonylurea (ALS) herbicides.
- Sedges Controlled: Cyperus rotundus (nutsedge), Cyperus iria, Cyperus difformis, and Fimbristylis miliacea
- Broadleaf Weeds: Ludwigia parviflora, Sphenoclea zeylanica, Eclipta alba, and Monochoria vaginalis
- Application Window: Applied at 20 to 25 days after transplanting or direct seeding when weeds have 3 to 5 leaves
Field Application Guidelines and Water Management
Because bentazone is a contact herbicide with limited translaminar movement, thorough foliar spray coverage is essential.
Drain standing water from paddy basins 1 to 2 days prior to spraying to expose target weed foliage, and replenish irrigation 48 hours later.
- Water Level: Ensure weed foliage is fully exposed above the water line at the time of spray application
- Spray Volume: Apply with 150 to 200 liters of water per acre using a flat-fan or deflector nozzle
- Weather Timing: Apply under bright sunny conditions; warm sunlight accelerates Photosystem II inhibition
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the active molecule in Basagran?
Basagran contains bentazone 48% SL (soluble liquid), a contact Photosystem II inhibitor.
Does Basagran control grass weeds like barnyard grass?
No, Basagran specifically controls sedges and broadleaf weeds; it does not control grassy weeds like Echinochloa.
Why must paddy water be drained before applying Basagran?
Basagran works strictly on contact with foliage; draining standing water ensures weed leaves are fully exposed to the spray.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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