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Comprehensive Guide to Using Shedder 1000 ml 20SL Paraquat Herbicide in Pakistan
Paraquat is a fast‑acting, non‑selective contact herbicide that destroys the photosynthetic apparatus of green plant tissue within minutes. The active molecule interferes with electron transport in photosystem I, generating reactive oxygen species that cause cell membrane rupture and rapid desiccation of the foliage. Because it works only where it contacts the leaf surface, it is ideal for total vegetation control in non‑cropped areas, pre‑plant fallow, and for spot‑treatment of stubborn weeds in wheat, rice and cotton belts.
Target Weeds and Regional Compatibility
In the fertile alluvial soils of Central Punjab, the most problematic weeds are Phalaris minor, Avena fatua, and broad‑leaf species such as Trianthema portulacastrum. In the saline‑sodic soils of Southern Punjab and Sindh, weeds develop thicker cuticles, making Paraquat’s rapid uptake especially valuable. The product is approved for use on non‑crop fallow land and for pre‑emergence control of weeds before sowing wheat, rice or cotton. Due to the high alkalinity (pH 7.5‑8.5) of most Pakistani soils, Paraquat retains its activity without the need for pH adjustment.
Application Timing and Water Management
For optimal results, apply when the target weeds are in the 2‑4 leaf stage and the ambient temperature is between 15 °C and 30 °C. Avoid application during high wind (>10 km/h) or when rainfall is forecast within 2 hours. Use a calibrated sprayer delivering 200‑250 L ha⁻¹ at 30‑40 kPa. In areas with marginal water quality (EC 1.5‑3.0 dS m⁻¹), mix the herbicide with fresh canal water rather than saline tube‑well water to prevent premature degradation.
Safety and Protective Measures
Paraquat is highly toxic if ingested or absorbed through the skin. Always wear chemical‑resistant gloves, goggles, a half‑face respirator, and long‑sleeved coveralls. Keep the product in a locked, well‑ventilated storage area away from food, livestock and children. After spraying, maintain a 5 m buffer from water bodies and restrict livestock access for at least 48 hours. Dispose of any leftover solution according to local hazardous waste guidelines; do not pour it into drains or irrigation canals.
Post‑Application Recommendations
Inspect the treated area 24 hours after spray. If any crop injury is observed, irrigate lightly to dilute residual Paraquat and reduce phytotoxicity. For fields that will be sown immediately after herbicide use, wait a minimum of 48 hours before planting to ensure complete degradation under sunlight.
By following these agronomic best practices, Pakistani farmers can achieve clean, weed‑free fields while protecting human health and the environment.
Rizwan Randhawa - 28 Mar 2026
A1 quality, spray ka result bohot hi zabardast mila, highly effective.