What is a chemical used in agriculture, such as a pesticide or fertilizer, called?

In agriculture, a chemical that is utilized specifically for enhancing plant growth or protecting crops from pests and diseases is referred to as an agrochemical. This term encompasses a broad category that includes fertilizers, which provide essential nutrients to plants, as well as pesticides, which are designed to control various harmful organisms that can affect crops. Agrochemicals play a critical role in modern agriculture by increasing yield, productivity, and efficiency.

Reagents, while they are chemicals used in reactions or experiments, are not specifically targeted towards agricultural applications. Biopesticides are a specialized subset of pesticides that utilize natural substances, which is a smaller category than the broader agrochemical definition. Fumigants are also specific types of chemicals used to control pests in the soil or stored products but do not encompass the entire range of agrochemicals used in farming. Thus, agrochemical is the best term to describe the broader category including pesticides and fertilizers.