Trifluralin

Trifluralin belongs to the dinitroaniline chemical class and functions as a highly effective selective soil-applied herbicide. It is primarily used to control annual grasses and small-seeded broadleaf weeds in a pre-emergence regime. By inhibiting weed growth from the start, it ensures crops do not face early-season competition for nutrients and moisture.

The mechanism of action involves the inhibition of cell division in the meristematic tissues of weed roots and shoots. Trifluralin binds to tubulin proteins, preventing the formation of microtubules required for mitosis. This leads to the cessation of growth in susceptible weeds, causing them to die shortly after seed germination, often before they even break the soil surface.

This herbicide is widely applied to various crops including sunflowers, soybeans, dry beans, onions, tomatoes, and canola. It is particularly effective against species such as green foxtail, barnyard grass, and various pigweeds. It serves as a foundational component in integrated weed management programs, providing a lasting control barrier.

A critical agronomic requirement for Trifluralin is immediate soil incorporation to a depth of 5–7 cm. Because the active ingredient is volatile and prone to photodegradation when exposed to sunlight, surface application without incorporation is ineffective. Proper mechanical incorporation ensures the chemical is fixed in the soil profile where the target weed seeds are germinating.

When handling Trifluralin, strict safety precautions must be followed to avoid exposure and environmental contamination. Farmers should avoid use in soils with extremely high organic matter, which can tie up the chemical and reduce its efficacy. Operators are required to use personal protective equipment, and application equipment must be calibrated to ensure accurate distribution across the field.

• Strong resistance to leaching by rainfall.
• Requires immediate mechanical soil incorporation.
• Effective against many annual grasses.
• No activity on established perennial weeds.