Annual nitrogen loads exported to the Chesapeake Bay by source

Annual nitrogen loads exported to the Chesapeake Bay by source, 1950–2050. Fertilizer and manure are combined into a single agricultural source for the modeled time period. After 2010, the two future agricultural scenarios represent (1) increased intensity of both crop and animal agriculture, and (2) decreased intensity of both crop and animal agriculture (figure OV.S1). Only the future scenario for constant wastewater treatment technology is shown (Hopple and others, 2020, 2021)

Nitrogen in the Chesapeake Bay watershed—A century of change, 1950–2050