Nitrate-nitrogen (nitrate)

A highly soluble form of nitrogen that is both a nutrient and, in excess quantities, a toxic substance.

Ammoniacal nitrogen is converted to nitrate-nitrogen in soils, from where it can then leach into waterways. Nitrate is a plant fertiliser, however, due to its high solubility in water, it is one of the most common contaminants in rural and urban areas.

View a factsheet on Nitrogen