What license is required for a farmer using irrigation to apply fertilizers and pesticides?

The requirement for a farmer using irrigation to apply fertilizers and pesticides is to hold a Private Applicator license with a Chemigation Category. This is because chemigation involves the application of fertilizers and pesticides through irrigation systems, which demands specific training and knowledge about the safe and effective incorporation of these substances into the water supply used for irrigation.

The Private Applicator license ensures that the farmer has a foundational understanding of pesticide safety, labeling, proper application techniques, and environmental considerations. The Chemigation Category specifically addresses the unique aspects of delivering pesticides and fertilizers through an irrigation system, including how to prevent contamination of water sources and how to calibrate equipment correctly for this application method.

Other options, while relevant to pesticide application or agricultural practices, do not specifically address the requirements for farmers using irrigation systems for applying fertilizers and pesticides. Therefore, the specific combination of a Private Applicator license with the Chemigation Category is crucial for compliance and safety in this context.