Product Overview

S-Metolachlor is a highly effective selective pre-emergence herbicide widely used for controlling annual grasses and certain broadleaf weeds in corn, soybean, peanut, cotton, potato, and sorghum fields.It belongs to the chloroacetanilide family and represents the optically active isomer of metolachlor, offering stronger herbicidal activity, lower use rates, and improved crop safety.Once applied to the soil surface, S-Metolachlor forms a thin protective layer that prevents weed seeds from germinating and emerging—allowing crops to grow free from early competition.

Basic Information

• Product Name: S-Metolachlor

• CAS Number: 87392-12-9

• Molecular Formula: C₁₅H₂₂ClNO₂

• Molecular Weight: 283.79

• Appearance: Clear to light yellow liquid

• Shelf Life: 2 years when stored in a cool, dry, and ventilated place

• Common Content:  95% TC

• Standard: FAO/WHO

Target Weeds

S-Metolachlor effectively controls a wide range of annual grassy and some broadleaf weeds, such as:

• Echinochloa crus-galli (Barnyardgrass)

• Setaria viridis (Green foxtail)

• Digitaria sanguinalis (Large crabgrass)

• Amaranthus retroflexus (Redroot pigweed)

• Chenopodium album (Lambsquarters)

• Acalypha australis (Copperleaf)

Application Guidelines

Adjust dosage according to soil type, organic matter content, and weed density.
Avoid overlapping spray or waterlogging after application.

Physical & Chemical Properties

Appearance: Clear to pale yellow liquid

Density (20 °C): 1.06–1.08 g/cm³

pH (1% aqueous solution): 4.0–7.0

Solubility: Slightly soluble in water; soluble in most organic solvents

Stability: Stable under normal storage; degrades under strong sunlight or alkaline conditions

Product Advantages

Broad-spectrum weed control – Effective against annual grasses and several broadleaf weeds.

Long-lasting residual effect – Provides continuous control for 4–6 weeks after application.

Excellent crop selectivity – Safe for corn, soybean, peanut, and cotton.

bow dosage and high efficiency – Requires less active ingredient per hectare.

Good tank-mix compatibility – Can be combined with other herbicides for extended control.

Environmentally favorable profile – Low toxicity to mammals and minimal residue in soil.

Safety and Handling

Avoid contamination of ponds, rivers, and irrigation water.

Toxic to aquatic organisms and some beneficial insects.

Wear protective gloves, clothing, and respirator during handling and application.

Do not eat, drink, or smoke while using the product.

Store in a cool, dry, well-ventilated location away from direct sunlight and heat sources.