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This NebGuide presents best management practices (BMPs) which can be used to reduce atrazine runoff from dryland and irrigationd corn fields in Nebraska. Atrazine is one of the most widely used herbicides in Nebraska. It is used alone or combination with other herbicides for weed control in both dryland and irrigationd corn. Atrazine is popular because of its effectiveness and economy. However, environmental concerns are an increasingly important part of producer decisions regarding weed control, fertility and irrigation management practices. A public concern is reducing atrazine runoff to surface waters. Best management practices (BMPs) reduce the amount of atrazine at the soil surface, reduce water runoff from a field and reduce losses from the first runoff after atrazine application.