Nicosulfuron
Overview
Nicosulfuron is a systemic sulfonylurea herbicide developed for selective weed control in corn (maize) cultivation. First introduced in the 1990s, it has become a key component in modern agricultural weed management programs. The compound works by inhibiting the acetolactate synthase (ALS) enzyme, which is essential for plant growth. As a post-emergence herbicide, nicosulfuron is particularly effective against problematic weeds like foxtail, barnyard grass, and certain broadleaf species. Its selective action allows it to control weeds while maintaining crop safety when used according to label instructions. The herbicide is available in various formulations, including wettable powders and water-dispersible granules.
Physical and Chemical Properties
Nicosulfuron appears as a white to off-white crystalline powder with a melting point range of 141-144°C. It has limited solubility in water (approximately 120 mg/L at 20°C) but dissolves well in many organic solvents including acetone and methanol. The compound is stable under normal storage conditions but may degrade when exposed to strong acids or bases. The molecular structure of nicosulfuron contains both sulfonylurea and pyrimidine moieties, which contribute to its herbicidal activity. It exhibits moderate persistence in soil, with a half-life typically ranging from 2 to 4 weeks depending on environmental conditions. The herbicide is non-volatile and has low potential for leaching in most soil types.
Main Applications
Nicosulfuron is primarily used for post-emergence weed control in field corn, sweet corn, and popcorn. It effectively manages a broad spectrum of weeds including Echinochloa crus-galli (barnyard grass), Setaria spp. (foxtail), and certain broadleaf species. Application timing is critical, typically recommended when corn plants have 3-5 leaves and weeds are in early growth stages. In agricultural practice, nicosulfuron is often formulated with other herbicides like atrazine or rimsulfuron to broaden the weed control spectrum and reduce resistance development. The standard application rate ranges from 35-70 grams of active ingredient per hectare, depending on weed pressure and environmental conditions. Adjuvants are frequently added to enhance foliar absorption and rainfastness.
Safety and Storage
Nicosulfuron is classified as moderately hazardous (WHO Class II) and requires proper handling precautions. Personal protective equipment including gloves, goggles, and protective clothing should be worn during mixing and application. The compound may cause skin and eye irritation upon contact. For storage, nicosulfuron should be kept in its original container in a cool, dry, well-ventilated area away from food and feed. The storage facility should be locked and inaccessible to unauthorized personnel. In case of spillage, contain the material and collect with inert absorbents. Shelf life is typically 2-3 years when stored properly in sealed containers.
B2B Procurement Guide
When procuring nicosulfuron in bulk quantities, buyers should verify the technical specifications including purity (commonly 95-98% for technical grade), moisture content, and impurity profiles. Reputable suppliers should provide Certificate of Analysis (CoA) and Material Safety Data Sheets (MSDS) with each shipment. Bulk packaging options typically include 25kg fiber drums or custom quantities based on business requirements. For international shipments, proper hazardous material documentation and compliance with local pesticide regulations must be ensured. Buyers should establish quality control protocols including sampling and laboratory testing for incoming materials. Long-term contracts with reliable manufacturers can help secure stable pricing and supply continuity.
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