Atrazine Use and Weed Management Strategies to Protect Surface Water Quality
Atrazine can be applied to the soil surface either before or after planting, incorporated into the soil prior to planting, or sprayed on corn and weeds, postemergence. Knowing that atrazine moves predominately in solution (dissolved in water) versus attaching to soil particles aids our understanding of how to reduce its movement off-site. It is important to understand how atrazine works to control weeds. When applied on or incorporated into the soil, atrazine reaches the soil profi le dissolved in rainwater. It is absorbed through the roots of corn plants and weeds, but corn plants can detoxify atrazine and are seldom affected by root absorption. Atrazine applied postemergence is primarily absorbed through the leaves, but any atrazine that reaches the soil surface is absorbed by plant roots as described above.