Sten (Glufosinate Ammonium 13.5% SL) Herbicide
The Broad-Spectrum Solution for Hard-to-Kill Weeds by Coromandel International
Sten is a powerful, broad-spectrum contact herbicide designed to solve modern farming challenges. Manufactured by Coromandel International, it is the ideal alternative to manual weeding, saving you labor costs and time.
Unlike standard weed killers, Sten works effectively against tough weeds that have developed resistance to other chemicals (like Glyphosate). It is perfect for directed spraying in Cotton and Tea, as well as maintaining clean orchards in Grapes and Pomegranates.
Why Choose This Product? Key Benefits
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Fast Action: Visible yellowing in 2-4 days; complete burnout in 3-5 days.
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Resistance Breaker: Controls weeds that survive other herbicides (like Glyphosate-tolerant species).
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No Soil Residue: Breaks down rapidly in the soil, making it safe for your next crop rotation.
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Rainfastness: Requires only a 4–6 hour rain-free window for full efficacy.
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Crop Safety: Contact-only action means it won't damage crop roots if sprayed carefully between rows.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand Name | Sten |
| Technical Name | Glufosinate Ammonium 13.5% SL |
| IRAC MoA Code | Group 10 (Glutamine Synthetase Inhibitor) |
| Chemical Group | Phosphinic Acid |
| Formulation | Soluble Liquid (SL) |
| Toxicity Label | Blue Label (Moderate Toxicity) |
How It Works: Mode of Action
Sten operates differently from systemic weed killers. It is a contact herbicide that mimics a natural plant nutrient (glutamate).
- Absorption: The spray lands on the weed leaves and penetrates the surface (aided by built-in surfactants).
- Enzyme Blockade: It irreversibly inhibits the enzyme Glutamine Synthetase.
- Ammonia Overload: This blockage causes rapid ammonia buildup inside the plant cells, destroying cell membranes and stopping photosynthesis, leading to quick death.
Note: This process is faster in bright sunlight, as sunlight drives the plant activity that causes the ammonia buildup.
Target Crops & Pests
| Crop | Target Pest(s) |
|---|---|
| Tea Plantations | Borreria, Imperata cylindrica, Commelina, Ferns, and Grasses |
| Cotton (Inter-row) | Echinochloa, Dactyloctenium, Cynodon, and other mixed weeds |
| Fruit Orchards (Grapes, etc.) | General annual and perennial weed control (Protected spray) |
Dosage & Application Guide
The Golden Rule: Always follow the "Dose per Acre" and ensure high water volume (200+ Liters) for accurate results. Sten kills only what it touches.
Dosage per Acre, Litre, & Pre-Harvest Interval (PHI)
| Crop | Dose (ml / Acre) | Water (L / Acre) | Dose (ml / Litre) | PHI (Days) |
|---|---|---|---|---|
| Tea | 1000 - 1500 ml | 200 - 250 L | 5 - 7.5 ml | Refer to Label |
| Cotton | 1000 - 1500 ml | 200 - 250 L | 5 - 7.5 ml | Refer to Label |
| Grapes/Orchards | 1000 - 1500 ml | 200 - 250 L | 5 - 7.5 ml | Refer to Label |
*PHI = Pre-Harvest Interval: The minimum number of days to wait between the last spray and harvesting.
How to Apply: Best Practices
- Timing: Spray on bright, sunny days when weeds are young (2-4 inches tall). Avoid spraying if rain is expected within 6 hours.
- Mixing: Use high water volume (200-250 Liters per acre) to ensure the weeds are thoroughly wet.
- Coverage: Use Flat Fan or Flood Jet nozzles for medium/coarse droplets. Do NOT use hollow cone nozzles (fine mist) as they drift too easily.
- Safety: Always wear PPE (gloves, mask, goggles). Use a spray hood/shield when spraying in Cotton or Tea to protect the main crop leaves.
Frequently Asked Questions
1. Does Sten kill the roots of the weeds?
Sten is primarily a contact herbicide. It burns down the green parts it touches but has limited movement to the roots. It is excellent for top-kill but less systemic than glyphosate.
2. Can I use Sten on Cotton?
Yes, but only as a "directed spray" between rows. You must ensure the spray does not touch the green leaves or green stems of the cotton plant. Use a hood for safety.
3. How long does it take to see results?
It is faster than systemic herbicides. You will see yellowing in 2-4 days and complete drying in 3-5 days, provided it is sprayed on a sunny day.
4. Is it safe for the next crop?
Yes. Sten degrades rapidly in the soil (half-life of 3-20 days) and does not persist, making it safe for crop rotation.
5. Why is high water volume recommended?
Since Sten is a contact herbicide, it must cover as much leaf surface area as possible to work. Low water volume leads to poor coverage and poor results.
Safety & Disclaimer
Always read and follow the instructions on the official product label. The information provided here is for guidance only. Use personal protective equipment (PPE) during application. Sten is moderately toxic (Blue Label) and may affect fertility; avoid exposure during pregnancy.
