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Nitrate Content of the Upper Rio Grande as Influenced by Nitrogen Fertilization of Adjacent Irrigated Lands¹

ABSTRACT

Over a 30-year period, when the application of N fertilizer to three irrigated areas adjacent to the Upper Rio Grande increased from a very low to a high level, the overall NO₃-N concentration of the river did not increase, indicating no significant stream pollution by NO₃-N from applied N fertilizer.

¹ Joint contribution from the US Salinity Laboratory, Soil and Water Conservation Research Division, ARS, USDA, Riverside, Calif., the Bureau of Reclamation, USDI, El Paso, Texas, and the Int. Boundary and Water Comm., USDA, El Paso, Texas.

² Director and retired Soil Scientist, respectively, US Salinity Laboratory.

Received for publication April 21, 1969. Accepted for publication June 16, 1969.