Astra, KE (propizochlor, 720 g/l)

Mechanism of Action and Selectivity

The core efficacy of the Astra, EC herbicide lies in its high-concentration propisochlor formulation (720 g/l). This active ingredient, belonging to the chloroacetamide class, acts as a systemic inhibitor of protein and nucleic acid synthesis. Unlike acetochlor-based soil herbicides, propisochlor offers a gentler effect on crops, which is critical for sunflowers, soybeans, and corn. The preparation blocks cell division in the meristematic tissues of grass weed seedlings, halting their development before they emerge from the soil surface.

Technical Formulation Advantages

The emulsifiable concentrate (EC) form ensures rapid distribution of the active ingredients within the soil solution. Upon contact with moisture in the soil layer, it forms a protective «screen» that remains in the upper horizon, effectively intercepting weed roots during the germination phase. The systemic nature of the product eliminates the need for mechanical incorporation provided there is sufficient soil moisture, while the selective nature of the formulation allows for use on sensitive crops without the risk of phytotoxicity when regulations are followed.

Application Recommendations

The use of Astra, EC requires strict adherence to dosage: the application rate is 2–3 liters per hectare depending on soil type and weed infestation levels. This product, manufactured by Nanjing Essence Fine Chemical Co., Ltd., is a single-season solution, minimizing the pesticide load on the field. The hazard class 3 implies standard precautions for handling agrochemicals. It is important to note that maximum effect is achieved when applied pre-emergence, making Astra a foundational tool in programs for controlling annual grass weeds at the start of the vegetation period.