SMT-EXTRA

Double-Control Technology: How SMT-EXTRA Works

The efficiency of the pre-emergence herbicide SMT-EXTRA from Agrostar Chemical relies on the synergy of two powerful active ingredients: terbuthylazine and S-metolachlor. Unlike single-component products, this combination provides systematic control over a broad spectrum of annual broadleaf and grass weeds before they even emerge through the soil surface.

Mechanisms of Action:

• S-metolachlor: Blocks cell division and protein synthesis in weed seedlings. Its primary target is grass species, which are highly sensitive to this component during the germination stage.
• Terbuthylazine: A triazine derivative that suppresses photosynthesis. Its chemical structure allows it to effectively target broadleaf weeds by blocking electron transport within the pest's cells.

The suspension concentrate formulation ensures stability within the spray tank. When applied to corn or sunflower fields before emergence, SMT-EXTRA creates a "protective screen" in the topsoil layer. Moisture (rainfall or irrigation) activates the components, allowing them to penetrate the weed seed germination zone.

Practical Advantages of Selective Action:

Due to its systemic and selective nature, this herbicide does not suppress the crop when application guidelines are followed (dosage rates range from 1.0 to over 3.0 L/ha depending on soil type and weed pressure). A single application is sufficient to keep the field clean during the critical early growth stage, when competition for nutrients and moisture is at its peak. While classified as a Class 2 hazard, ensuring standard safety measures during application, it offers high speed and reliability in neutralizing unwanted vegetation.