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Crop Protection & Pesticides

Almix Herbicide: Metsulfuron + Chlorimuron, Rice Weeds and Dose

Almix is an ultra-low-dose selective post-emergence herbicide manufactured by FMC, containing Metsulfuron-methyl 10% + Chlorimuron-ethyl 10% WP. Formulated specifically for transplanted and direct-seeded rice (DSR), Almix provides exceptional broad-spectrum control of stubborn broadleaf weeds and sedges at mere grams per acre.

Last reviewed: 10 November 2026

Chemical composition and sulfonylurea mode of action

  • Dual sulfonylurea blend: Contains Metsulfuron-methyl (10%) and Chlorimuron-ethyl (10%) formulated as a Wettable Powder (WP).
  • ALS / AHAS enzyme inhibition: Selectively blocks acetolactate synthase, halting the synthesis of essential branched-chain amino acids (valine, leucine, isoleucine) in target weeds.
  • Foliar and root systemic uptake: Absorbed rapidly by weed foliage and roots, translocating to meristematic growing points; weed growth ceases within hours of application.
  • Ultra-low dose efficiency: Applied at just 8 grams per acre, drastically reducing chemical load on the agricultural soil ecosystem.

CIBRC approved target weeds in rice cultivation

Approved in Indian rice farming for controlling Cyperus difformis, Cyperus iria, Fimbristylis miliacea, Eclipta alba, Ludwigia parviflora, Sphenoclea zeylanica, and Monochoria vaginalis. Applying 20 to 25 days after transplanting (or when weeds are at the 2 to 4-leaf stage) eliminates broadleaf and sedge competition without stunting rice tillers.

Application guidelines, dosage and safety

  • Follow approved label dosage strictly: 8 grams of Almix mixed with the supplied non-ionic surfactant per acre in 150 to 200 liters of water.
  • Drain excess standing water from the paddy field before spraying so weed foliage is exposed; re-flood the field 48 hours after application to seal the weed kill.
  • Use a flat-fan or flood-jet nozzle operating at low pressure for uniform foliar distribution.
  • Observe the mandatory Pre-Harvest Interval (PHI) specified on the container before harvesting.

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 (CIBRC) ↗

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Common questions

What are the active chemical ingredients in Almix herbicide?

Almix contains Metsulfuron-methyl 10% + Chlorimuron-ethyl 10% formulated as a Wettable Powder (WP).

What is the recommended application dose of Almix per acre?

The approved label dosage is 8 grams per acre, applied with the accompanying surfactant in 150 to 200 liters of water.

Should water be drained from the paddy field before spraying Almix?

Yes, standing water should be drained to expose weed foliage directly to the spray, followed by re-flooding 2 days later.

General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.

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