Persistence of sulfosulfuron under wheat cropping system

Area of Science:

• Agricultural Chemistry
• Environmental Science
• Soil Science

Background:

• Herbicide residues in soil pose risks to subsequent crops and health via bioaccumulation.
• Effective weed management in wheat requires understanding herbicide persistence.

Purpose of the Study:

• To evaluate the persistence and dissipation of sulfosulfuron herbicide residues in soil.
• To determine the impact of different application rates on residue levels over time.

Main Methods:

• Field experiment applying sulfosulfuron to wheat at 25, 50, and 100 g ai ha(-1).
• Analysis of sulfosulfuron residues in surface and subsurface soil using High-Performance Liquid Chromatography (HPLC) with a Photo Diode Array (PDA) detector.
• Monitoring residue levels at various time points post-application.

Main Results:

• Sulfosulfuron residues dissipated rapidly in both surface and subsurface soil, especially during the initial period.
• After 150 days, residues in plots treated with 25 and 50 g ha(-1) were below 0.001 microg/g.
• At the highest application rate (100 g ha(-1)), sulfosulfuron residues were not detected in soil after 200 days.

Conclusions:

• Sulfosulfuron exhibits rapid dissipation in soil, suggesting a low risk of long-term accumulation.
• The herbicide is effectively controlled within 150-200 days, even at higher application rates.
• This indicates favorable environmental behavior for sulfosulfuron in wheat cropping systems.