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Many irrigators apply chemicals such as fertilizers, herbicides, and insecticides with their irrigation systems. This practice, called chemigation, can be an effective applicatio method if the chemical is suited to this practice and the irrigation system is properly engineered. Chemigation is regulated in Nebraska. The Department of Environmental Control (DEC) and the Natural Resource Districts (NRDs) conduct impsection and enforcement programs. This guide describes only the equipment requirements of DEC's regulations.