What do you call a farmer who use fertilizer?

There's not really a specific term for a farmer who uses fertilizer. All farmers who grow crops typically use some form of fertilizer, whether it's natural compost, manure, or chemical fertilizers.

However, you could use these terms depending on the context:

* Conventional farmer: This term is often used for farmers who rely heavily on chemical fertilizers and pesticides.

* Sustainable farmer: This term is used for farmers who focus on practices that promote long-term soil health, often using organic fertilizers and reducing their reliance on chemicals.

* Organic farmer: This term is used for farmers who are certified by an organization to follow specific guidelines for organic farming, which includes using only natural fertilizers and prohibiting the use of synthetic fertilizers and pesticides.

Ultimately, the best term to use depends on what you want to emphasize about the farmer's practices.