Overview
Propanil is a post-emergence herbicide first introduced in the 1960s, becoming a cornerstone of rice weed management programs globally. As an aromatic amide compound, it specifically targets grassy weeds while showing selectivity for rice crops when properly applied. The herbicide's mode of action involves inhibition of photosystem II, disrupting electron transport and ultimately causing weed death. Manufactured through the reaction of 3,4-dichloroaniline with propionic acid derivatives, Propanil offers relatively rapid breakdown in the environment compared to persistent herbicides. Its effectiveness against economically damaging weeds like Echinochloa crus-galli (barnyard grass) has made it particularly valuable in rice-growing regions across Asia and North America.
Physical and Chemical Properties
Propanil presents as crystalline solid at room temperature with low volatility (vapor pressure of 1.1×10^-5 mmHg at 25°C). Its moderate water solubility allows for effective foliar application while limiting excessive soil mobility. The compound shows stability under normal storage conditions but hydrolyzes under strongly alkaline conditions. Chemically, Propanil features a dichlorinated aromatic ring connected to a propionamide group, which contributes to its selective herbicidal activity. The molecular structure enables rapid penetration through weed foliage while allowing rice plants to metabolize the compound via aryl acylamidase enzymes, accounting for its crop selectivity.
Main Applications
Propanil finds primary use in rice paddies, typically applied at 2-4 kg active ingredient per hectare 2-3 weeks after transplanting. It controls annual grasses including barnyard grass, crabgrass, and foxtail species while being safe for established rice plants. Some formulations combine Propanil with other herbicides like molinate for broader spectrum control. Beyond rice, some agricultural systems use Propanil in wheat and barley, though application rates and timing require careful management to avoid crop injury. The herbicide's rapid soil degradation (half-life of 1-3 days) makes it suitable for rotational cropping systems where subsequent plantings might be sensitive to residual herbicide activity.
Safety and Storage
As a Category III herbicide (slightly toxic), Propanil requires standard pesticide handling precautions. Workers should wear chemical-resistant gloves, protective eyewear, and long-sleeved clothing during mixing and application. The compound may cause methemoglobinemia if absorbed in significant quantities, necessitating immediate medical attention for exposure cases. Storage facilities should maintain temperatures below 35°C and separate Propanil from strong oxidizers, acids, and alkaline materials. Bulk containers should be kept tightly sealed to prevent moisture absorption, which can lead to caking. Firefighting measures for Propanil involve using dry chemical, CO2, or foam extinguishers, as water may not effectively control fires involving this material.
B2B Procurement Guide
When sourcing Propanil commercially, buyers should prioritize suppliers with GMP (Good Manufacturing Practice) certification and complete analytical documentation. Technical grade material typically assays at 95-98% purity, with impurities primarily consisting of synthesis byproducts. Packaging options range from 25 kg fiber drums to bulk super sacks for large-scale agricultural operations. Procurement contracts should specify delivery terms accounting for seasonal demand peaks in rice-growing regions. Many manufacturers offer formulation services, producing ready-to-use emulsifiable concentrates (EC) or wettable powders (WP) at 30-50% active ingredient concentrations. Import/export compliance requires verification of regional pesticide regulations, as some countries restrict Propanil use or require special permits for transportation.
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