About 98% of atrazine usage is on agricultural crops.

Its primary use is as a pre- and post-emergent herbicide on field and sweet corn, especially in the Midwestern corn-belt states.

According to the US Department of Agriculture, about 69% of the corn crop was treated with atrazine in 1998 and about 82% of sorghum was treated with atrazine.

Atrazine is also used for weed control on sugarcane fields.