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Photo from U.S. Geological Circular 1225--The Quality of Our Nation's Waters--Nuttients and Pesticides

Graph shoiwng nitrate concentrations
in of drainage area in agriculture
During high spring streamflows following fertilizer application in the northern Willamette Basin, nitrate concentrations increased in proportion to the percentage of drainage area in agriculture. Nutrient concentrations also were found to increase with the percentage of drainage area in agriculture for watersheds in the Ozark Plateaus, Potomac River Basin, and Trinity River Basin.

 

 

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