Generic name given to chemicals (fertilizers, pesticides, insecticides, etc.) use in agricultural to facilitate plant growth and protection. In short, they are agricultural chemicals.
Although initially used to improve crop production, overuse of chemicals has now started affecting the environment. Apart from the obvious effects on crops and the food chain, agro chemicals have a wide area of application. Due to these many uses, they seep into the surrounding land and water bodies, therefore having a widespread effect.