Active ingredient mechanism, chemical class, and weed spectrum
Sencor belongs to the triazinone chemical family (HRAC Group 5) and controls broadleaf weeds and annual grasses by interrupting photosynthetic electron transport.
- Broadleaf weed control: Effectively manages Chenopodium album (bathua), Melilotus alba (senji), Amaranthus viridis (chaulai), and Portulaca oleracea.
- Grassy weed management: Suppresses troublesome annual grasses including Phalaris minor (gulli danda), Echinochloa colonum, and Digitaria species.
- Systemic root and foliar uptake: Absorbed through both emerging weed roots and foliar tissue, providing persistent residual soil activity.
- Crop safety window: Highly selective when applied at recommended agronomic stages in potato, sugarcane, soybean, and transplanted tomato.
Application timing, soil moisture requirements, and sprayer calibration
Field efficacy depends strictly on adequate soil moisture at application and precision sprayer calibration.
- Potato application: Applied as pre-emergence within 3 to 4 days after planting before crop sprouts emerge, or early post-emergence up to 5% potato emergence per label guidelines.
- Sugarcane application: Applied as pre-emergence over trash or clean soil beds before cane shoots emerge, or early post-emergence in ratoon crops.
- Soil moisture prerequisite: Requires damp, well-pulverized soil for the active ingredient to form an even chemical barrier in the top soil layer.
- Sprayer nozzle calibration: Must be sprayed using a manually operated knapsack or tractor-mounted boom sprayer fitted with flat fan or floodjet nozzles.
Handling precautions, crop rotation intervals, and safety
Applicators should observe label dosage instructions approved by the Central Insecticide Board and Registration Committee (CIBRC). Wear chemical-resistant gloves, masks, and boots during mixing and application. Strictly avoid overlapping spray swaths, and follow recommended recropping intervals before planting sensitive following crops like cucurbits or brassicas.
Official source
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Directorate of Plant Protection, Quarantine & Storage (CIBRC) ↗Related on KisanPe
Common questions
What is the active ingredient in Bayer Sencor herbicide?
Sencor contains Metribuzin 70% WP (wettable powder), a selective triazinone herbicide inhibiting photosystem II.
In which crops is Sencor herbicide officially registered?
It is registered for weed management in potato, sugarcane, soybean, wheat, and transplanted tomato.
Why is soil moisture critical when applying Sencor?
Soil moisture activates the Metribuzin chemical barrier in the upper soil zone, allowing root uptake by germinating weed seedlings.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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