Iris Herbicide: Acifluorfen & Clodinafop Care in Soybean

Dual Active Chemistry and Complementary Modes of Action

Iris combines two distinct herbicide chemistries: Sodium Acifluorfen belongs to the diphenylether class (HRAC Group 14 - PPO inhibitors), which inhibits protoporphyrinogen oxidase, generating reactive oxygen species that rupture cell membranes in susceptible broadleaf weeds under sunlight.

Clodinafop-propargyl belongs to the aryloxyphenoxypropionate group ('Fops' - HRAC Group 1 - ACCase inhibitors), which halts fatty acid synthesis in grassy weeds. Together, they deliver rapid foliar burndown and systemic kill across mixed weed flushes.

• Dual Spectrum Activity: Simultaneous control over broadleaf weeds and annual grassy weeds in a single application.
• PPO & ACCase Synergy: Combines rapid contact cell disruption with systemic grass lipid inhibition.
• Soybean Selectivity: Soybean plants rapidly metabolize both active compounds, ensuring high crop safety.

Target Weed Spectrum in Soybean Fields

Weed competition during the first 30 to 45 days after soybean sowing can severely reduce branching and pod formation. Iris is designed to control aggressive weed complexes common in heavy black soils.

Key controlled broadleaf weeds include Commelina benghalensis (dayflower / kankawa), Digera arvensis, Celosia argentea, and Trianthema portulacastrum, alongside problematic annual grasses such as Echinochloa colona and Dactyloctenium aegyptium.

• Broadleaf Control: Eliminates Commelina, Digera, and Trianthema competing for sunlight and soil nutrients.
• Grassy Weed Kill: Shuts down barnyard grass and wild finger-grasses.
• One-Shot Convenience: Eliminates the need for separate tank mixing of broadleaf and graminicide herbicides.

Application Timing and Spray Guidelines

Apply Iris as an early post-emergence spray when weeds are young and actively growing at the 2 to 4 leaf stage (typically 15 to 25 days after soybean sowing). Ensure adequate soil moisture is present during application.

Use a knapsack or tractor boom sprayer fitted with flat fan nozzles to achieve uniform foliar coverage. Avoid spraying during drought stress or when soybean crops are severely waterlogged.

• Optimal Weed Stage: Spray when weed seedlings are actively growing at 2 to 4 leaves.
• Moisture Requirement: Adequate soil moisture enhances herbicide absorption and translocation.
• Nozzle Selection: Flat fan nozzles produce even, overlapping spray fans across crop rows.

Related on KisanPe

• Crop Protection Advisory →
• Soil Health Management →
• Wheat Farmer Solutions →
• Pesticide calculator →
• Ask Sakhi AI →

Common questions

General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.