Kroll Herbicide (Oxyfluorfen 23.5% EC) – Expert Weed Control for Onions, Rice & Tea
Stop weeds before they start. The ultimate pre-emergence solution for modern farmers.
Kroll by Krishi Rasayan is a powerful broad-spectrum herbicide designed to tackle the toughest broadleaf weeds and grasses. Whether you are growing onions, direct-seeded rice (DSR), or tea, Kroll creates a chemical barrier on the soil, preventing weeds from stealing your crop's sunlight and nutrients. It saves you from expensive manual labor and ensures your crop gets a head start.
Best for: Onion, Tea, Potato, Groundnut, and Rice (DSR).
Why Choose This Product? Key Benefits
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Saves Labor & Costs: One bottle does the work of 15-20 manual laborers. Reduce your weeding costs by nearly 80% compared to hand-weeding.
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Long-Lasting Residual Action: Kroll binds to the soil surface, creating a protective shield that kills weeds as soon as they try to emerge, keeping fields clean for weeks.
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Fast-Acting Results: Powered by sunlight, it kills weeds rapidly upon contact. You will see weeds drying out and dying shortly after application on sunny days.
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Rainfast in 1 Hour: Once applied, it sticks firmly to the soil or weed leaf within an hour, making it safe to use even during the monsoon season.
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Broad-Spectrum Control: Effectively destroys difficult broadleaf weeds like Bathua (Chenopodium) and Chaulai (Amaranthus), along with tricky grasses.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand Name | Kroll |
| Technical Name | Oxyfluorfen 23.5% EC |
| IRAC MoA Code | Group 14 (PPO Inhibitor) |
| Chemical Group | Diphenyl Ether |
| Formulation | Emulsifiable Concentrate (Liquid) |
| Toxicity Label | Blue (Moderately Toxic) / Green |
How It Works: Mode of Action
Kroll works differently than standard weed killers. It acts as a contact herbicide that targets the cell membranes of the weed.
- Contact & Absorption: The chemical creates a film on the soil or coats the weed leaf. It is lipophilic (oil-loving), so it absorbs quickly into the waxy plant surface.
- Sunlight Activation: This is the key. When the treated weed is exposed to sunlight, Kroll triggers a reaction that creates "active oxygen" inside the plant cells.
- Cellular Destruction: This active oxygen ruptures the cell walls. The weed loses water rapidly, dries out (necrosis), and dies. This happens without affecting the roots of your crop below the soil.
Note: Because it needs light, it works fastest on bright, sunny days.
Target Crops & Pests
[Image of Chenopodium album weed]| Crop | Target Pest(s) |
|---|---|
| Onion | Chenopodium (Bathua), Amaranthus (Chaulai), Broadleaf weeds |
| Rice (Pre-emergence) | Barnyard Grass (Echinochloa), Rice Flatsedge (Cyperus), Eclipta |
| Tea, Potato & Groundnut | Imperata, Digitaria, Trianthema (Carpet weed), Borreria |
Dosage & Application Guide
The Golden Rule: Always follow the "Dose per Acre" for accurate results. Mixing per liter can vary based on your pump size, but the total chemical goes into the soil.
Dosage per Acre, Litre, & Pre-Harvest Interval (PHI)
| Crop | Dose (ml / Acre) | Water (L / Acre) | Dose (ml / Litre) | PHI (Days) |
|---|---|---|---|---|
| Rice (DSR) | 250 - 400 ml | 200 - 300 L | ~ 1.5 ml/L | - |
| Onion, Potato, Groundnut | 180 - 350 ml | 200 - 300 L | ~ 1.2 ml/L | - |
| Tea & Mentha | 250 - 400 ml | 200 - 300 L | ~ 1.5 - 2 ml/L | 10 - 15 Days |
*PHI = Pre-Harvest Interval: The minimum number of days to wait between the last spray and harvesting.
How to Apply: Best Practices
[Image of flat fan nozzle spray pattern]- Timing: For Rice/Potato/Groundnut, apply within 0-3 days of sowing (Pre-emergence). For Onion, apply before transplanting or when the crop is established (15+ days).
- Mixing: Use a Flat Fan or Flood Jet nozzle. Avoid hollow cone nozzles to prevent drift.
- Coverage: Soil Moisture is Mandatory. Do not apply on dry dust. The soil must be moist for Kroll to form a continuous chemical layer.
- Safety: Always wear PPE (gloves, mask, goggles). Wash hands thoroughly after use.
Frequently Asked Questions
1. Can I use Kroll on dry soil?
No. Soil moisture is critical. The herbicide needs moisture to spread and bind to the soil particles to form a weed-barrier. If the soil is dry, irrigate lightly before spraying.
2. Will it damage my onion crop?
You might see slight tip burn or bronzing if applied post-emergence, but this is temporary. The onion plant is tough and typically recovers fully within 30 days without yield loss.
3. Is Kroll rainproof?
Yes. Kroll is rainfast within 1 hour of application, making it an excellent choice during the rainy season.
4. Can I mix it with other herbicides?
Yes. It is often tank-mixed with Pendimethalin to increase control over grasses in Onion and Groundnut fields. Always do a small compatibility test first.
5. Is it safe for bees?
Yes, when used as directed, Kroll is practically non-toxic to honeybees and birds.
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. Note: This product is restricted in Kerala state; check local regulations before purchase.
