Oxadiazon

Oxadiazon is a highly effective pre-emergence herbicide widely used in agricultural and non-crop areas for controlling a broad spectrum of weeds. With over 30 years of proven results, Oxadiazon remains a trusted choice for farmers and landscapers worldwide. Below you'll find comprehensive product specifications, application guidelines, and answers to frequently asked questions about this powerful herbicide.

Oxadiazon Product Specifications

Technical Parameters

• Chemical Name: 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-1,3,4-oxadiazol-2(3H)-one
• CAS Number: 19666-30-9
• Molecular Formula: C15H18Cl2N2O3
• Molecular Weight: 345.22 g/mol
• Appearance: Light brown to white crystalline powder
• Melting Point: 90-93°C
• Vapor Pressure: <1.0×10-5 Pa (25°C)
• Solubility: Water: 0.7 mg/L (20°C); Organic solvents: soluble

Available Formulations

Oxadiazon Application Guidelines

For optimal results with Oxadiazon, follow these application recommendations:

• Application Timing: Apply before weed emergence or at early growth stages
• Dosage: 1.0-2.0 kg a.i./ha for most crops; adjust based on soil type and weed pressure
• Method: Spray uniformly on soil surface or incorporate lightly (1-2 cm)
• Soil Conditions: Moist soil enhances effectiveness; irrigate if no rainfall within 2-3 days
• Rainfast Period: 6-8 hours after application
• Re-entry Interval: 12 hours for granular formulations; 24 hours for spray applications

Oxadiazon Target Weeds

Oxadiazon Safety Information

• Acute Oral LD50 (rat): >5000 mg/kg (practically non-toxic)
• Dermal LD50 (rabbit): >2000 mg/kg
• Inhalation LC50 (rat): >2.0 mg/L
• Eye Irritation: Mild irritant
• Skin Irritation: Slight irritant
• Environmental Impact: Low toxicity to birds and mammals; moderate persistence in soil (DT50: 30-90 days)

Oxadiazon FAQ

1. How long does Oxadiazon remain effective in the soil?

Oxadiazon typically provides weed control for 8-12 weeks after application, depending on environmental conditions. The herbicide binds moderately to soil particles (Koc 1000-2000 mL/g) and decomposes primarily through microbial action. In warm, moist soils, degradation occurs faster (30-60 days half-life), while in cool, dry conditions it may persist longer (60-90 days half-life). For best results in extended control situations, consider split applications or tank-mixing with other herbicides.

2. What crops can I use Oxadiazon on safely?

Oxadiazon is registered for use on numerous crops including rice (both transplanted and direct-seeded), citrus, grapes, apples, pears, stone fruits, and various ornamental plants. Always check the specific product label for registered uses in your region as crop tolerance may vary based on soil type, application method, and local regulations. Certain crops like lettuce, tomatoes, and cucurbits may be sensitive to Oxadiazon, so avoid using it in rotation with these plants unless specified on the label.

3. Can Oxadiazon be used in organic farming?

No, Oxadiazon is a synthetic herbicide and is not approved for use in certified organic farming systems. Organic producers should explore alternative weed control methods such as mulching, mechanical cultivation, or approved organic herbicides containing natural active ingredients like acetic acid or clove oil. If you're transitioning from conventional to organic production, be aware that Oxadiazon residues may persist in soil beyond the standard transition period (typically 36 months) depending on application history and environmental conditions.

For more detailed information about Oxadiazon applications, always consult the product label specific to your region and formulation. Proper use of this herbicide according to label directions ensures effective weed control while minimizing environmental impact and maintaining crop safety.