Active chemical composition and ALS inhibition
Sathi contains Pyrazosulfuron Ethyl 10% WP (wettable powder), an active compound belonging to the sulfonylurea chemical group.
It works by inhibiting the enzyme acetolactate synthase (ALS, also known as AHAS), halting the synthesis of essential branched-chain amino acids (valine, leucine, and isoleucine) in susceptible weeds. Cell division stops immediately, leading to chlorosis and necrosis within days.
- Active chemical: Pyrazosulfuron Ethyl 10% WP.
- HRAC group: Group 2 (ALS enzyme inhibitor).
- High selectivity: Rice seedlings metabolize the active ingredient rapidly, ensuring complete crop safety without stunting.
Target weeds and application window in rice
Sathi is registered for selective weed suppression in transplanted paddy, wet direct-seeded rice (DSR), and rice nursery beds.
It specifically eliminates difficult wetland sedges and broadleaf weeds before they compete with establishing rice seedlings.
- Application window: Applied early post-emergence at 3 to 8 days after transplanting or direct seeding when weeds are at 1 to 2 leaf stage.
- Key sedges controlled: Cyperus difformis, Cyperus iria, and Fimbristylis miliacea.
- Broadleaf weeds controlled: Ludwigia parviflora, Sphenoclea zeylanica, Eclipta alba, and Monochoria vaginalis.
Water management and application methods
Maintaining proper standing water depth is critical for activating Pyrazosulfuron Ethyl and ensuring continuous weed suppression.
Sathi can be applied as a uniform foliar spray using knapsack sprayers or broadcast evenly across the field mixed with dry sand or urea fertilizer into standing water.
- Water depth: Maintain 3 to 5 cm of standing water during application and retain it for 4 to 5 days without draining.
- Broadcast application: Mix the wettable powder thoroughly with dry sand or urea for uniform field broadcast.
- Precaution: Do not completely submerge rice plant tips under floodwater; drain excess floodwater before application if needed.
Official source
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ICAR - National Rice Research Institute ↗Related on KisanPe
Common questions
What is the active ingredient in UPL Sathi herbicide?
Sathi contains Pyrazosulfuron Ethyl 10% WP, a selective sulfonylurea herbicide for rice.
When should Sathi herbicide be applied in paddy?
It should be applied 3 to 8 days after transplanting or direct seeding when weeds are small (1 to 2 leaf stage).
Can Sathi be broadcast mixed with urea fertilizer?
Yes, Sathi can be mixed thoroughly with dry sand or urea and broadcast into standing water in the paddy field.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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