Ojika Herbicide (Pyrazosulfuron Ethyl 10% WG) – The Sedge Specialist
Advanced Japanese technology for total control of broadleaf weeds and sedges in Indian paddy fields.
Ojika is a premium herbicide brought to you by IFFCO-MC, a joint venture between India's IFFCO and Japan's Mitsubishi Corporation. It is designed to replace expensive manual weeding with a precise, low-dose chemical solution.
Ojika (Pyrazosulfuron Ethyl 10% WG) works systemically to keep your rice fields clean during the critical early growth stage, ensuring your crop gets all the nutrients it needs without competition.
Why Choose This Product? Key Benefits
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Perfect Timing: Applied ideally between 3 to 7 days after transplanting, it stops weeds before they can establish.
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Superior Crop Safety: Highly selective formulation that kills weeds but is completely safe for rice plants due to metabolic detoxification.
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Huge Cost Savings: One packet costs approx. ₹200, saving you over 90% compared to the cost of manual labor (₹3,000+).
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Soil Safe for Rotation: Rapidly degrades in soil (Half-life ~5.4 days), ensuring no harm to follow-up crops like wheat or mustard.
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Sedge & Broadleaf Killer: Specifically targets tough weeds like Cyperus iria (Motha) which ordinary grass killers often miss.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand Name | Ojika |
| Technical Name | Pyrazosulfuron Ethyl 10% WG |
| IRAC MoA Code | Group 2 (ALS Inhibitor) |
| Chemical Group | Sulfonylurea |
| Formulation | Wettable Granules (Dust-free WG) |
| Toxicity Label | Blue/Green Triangle (Moderate/Slight) |
How It Works: Mode of Action
Ojika operates as a systemic ALS (Acetolactate Synthase) inhibitor. It effectively "starves" the weed by stopping protein production.
- Absorption: The granules dissolve in water and are absorbed rapidly by the roots and shoots of the weeds.
- Inhibition: The chemical moves to the growing points (meristems) and blocks the biosynthesis of essential amino acids (Valine, Leucine, Isoleucine).
- Termination: Cell division stops immediately. The weeds turn yellow (chlorosis), stop growing, and die within 7–14 days.
Note: The molecular formula of the active ingredient is $C_{14}H_{18}N_{6}O_{7}S$.
Target Crops & Pests
| Crop | Target Pest(s) |
|---|---|
| Transplanted Rice | Sedges (Cyperus iria, Cyperus difformis) |
| Direct Seeded Rice (DSR) | Broadleaf Weeds (Ludwigia parviflora, Eclipta alba) |
| Rice Nursery | Aquatic Weeds (Monochoria vaginalis, Marsilea quadrifolia) |
Dosage & Application Guide
The Golden Rule: Always follow the "Dose per Acre" for accurate results.
Dosage per Acre, Litre, & Pre-Harvest Interval (PHI)
| Crop | Dose (g / Acre) | Water (L / Acre) | Dose (g / Litre) | PHI (Days) |
|---|---|---|---|---|
| Paddy (Transplanted) | 80 g | N/A (Sand Mix) or 150 L | ~0.5 g/L | 90-95 |
| Paddy (Direct Seeded) | 80 g | 150 - 200 L | 0.4 - 0.5 g/L | 90-95 |
| Nursery | 8 g per 1/10th acre | 15 - 20 L | 0.4 - 0.5 g/L | - |
*PHI = Pre-Harvest Interval: The minimum number of days to wait between the last spray and harvesting.
How to Apply: Best Practices
- Timing: Apply strictly between 3 to 7 days after transplanting (Pre-emergence to Early Post-emergence). Weeds must be small (1-2 leaf stage).
- Mixing (Sand Method): Mix the 80g pack thoroughly with 8–10 kg of dry sand or fertilizer (like Urea). Broadcast uniformly across the field.
- Coverage: Maintain standing water (3–5 cm level) in the field for 3 to 5 days after application. Do not drain or irrigate during this time to allow the "chemical blanket" to work.
- Safety: Always wear PPE (gloves, mask, goggles). Wash hands thoroughly after use.
Frequently Asked Questions
1. What is the price of Ojika?
The approximate price is ₹200 for an 80g pack (sufficient for 1 acre). This is significantly cheaper than manual labor costs.
2. Will Ojika kill grasses like Echinochloa?
Ojika is primarily for sedges and broadleaf weeds. For heavy grass infestation, it is recommended to use a sequential application of Bispyribac Sodium (Tokachi) at 20–25 DAT.
3. Can I mix Ojika with Urea?
Yes, Ojika is compatible with dry fertilizers like Urea for broadcasting application methods.
4. Is it safe for the next crop?
Yes, Ojika has a short half-life of about 5.4 days in soil. It leaves no harmful residue for rotational crops like wheat, mustard, or pulses.
5. What happens if it rains after application?
Since Ojika is applied into standing water or moist soil and absorbed via roots, light rain usually does not affect its performance. However, avoid application if heavy overflow of water is expected.
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.
