Overview
Pyrazosulfuron-ethyl Technical is a sulfonylurea herbicide widely used in rice cultivation for its selective weed control properties. It targets acetolactate synthase (ALS), an enzyme essential for branched-chain amino acid synthesis in weeds, leading to their growth inhibition. The compound is favored for its high activity at low doses, reducing environmental impact and application costs. Developed in the late 20th century, pyrazosulfuron-ethyl has become a staple in integrated weed management programs, particularly in Asia where rice is a staple crop. Its effectiveness against a broad spectrum of weeds makes it a preferred choice for farmers and agrochemical formulators.
Physical and Chemical Properties
Pyrazosulfuron-ethyl Technical appears as a white to off-white crystalline powder with a melting point of 181-183°C. It is slightly soluble in water but dissolves well in organic solvents like acetone and methanol, making it suitable for formulation into various herbicide products. The compound is stable under normal storage conditions but may degrade when exposed to prolonged moisture or high temperatures. Its molecular weight of 414.39 g/mol and precise chemical structure contribute to its targeted herbicidal activity, ensuring minimal impact on non-target plants when used correctly.
Main Applications
The primary application of pyrazosulfuron-ethyl Technical is in rice paddies, where it controls weeds such as barnyard grass, sedges, and broadleaf species. It is typically applied post-emergence, either directly to the water in paddy fields or as a foliar spray, depending on the formulation. Beyond rice, it is occasionally used in other crops where selective weed control is needed, though its use is predominantly in rice-growing regions like China, India, and Southeast Asia. The herbicide's low application rate (often 10-30 g per hectare) makes it cost-effective and environmentally favorable compared to older herbicide classes.
Safety and Storage
Pyrazosulfuron-ethyl Technical requires careful handling to avoid health risks. Direct contact with skin, eyes, or respiratory system should be avoided by using gloves, goggles, and masks. In case of exposure, rinse thoroughly with water and seek medical advice if symptoms persist. Storage should be in a cool, dry place, away from direct sunlight and moisture. The product should be kept in its original, tightly sealed container to prevent degradation. Proper disposal methods should be followed to avoid environmental contamination, adhering to local regulations for agrochemical waste.
B2B Procurement Guide
When procuring pyrazosulfuron-ethyl Technical, B2B buyers should prioritize suppliers with certifications such as ISO or FAO compliance. Key factors to verify include CAS number (93697-74-6), purity (typically 95%-98%), and batch-specific analysis reports. Purchasing in bulk may offer cost advantages, but ensure proper storage facilities are available. Consider suppliers with a track record in agrochemicals and those offering technical support for formulation. Price fluctuations may occur based on raw material availability, so long-term contracts can provide stability.
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