Agricultural chemicals include herbicides, fungicides, pesticides and fertilizers. They are used on agricultural land to protect crops from pests and diseases and to raise land fertility in order to increase agricultural yield per unit land. However, their mismanagement or over-application can lead to detrimental environmental impacts such as toxic pollution of food and drinking water. Agricultural chemical licensing, handling and application need to be controlled by properly enforced and monitored regulations.
Some high-income countries are defining agricultural practices necessary to protect ecosystems. In Denmark, fertilizer plans are required.