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Nitrogen Fertilizer and Nitrate Concentrations in Tributaries of the Upper Sangamon River in Illinois¹

ABSTRACT

Cross section multiple regressions were used to test the importance of nitrogen fertilizer use for variations in the nitrate nitrogen concentrations in 16 small tributaries of the Sangamon River in east central Illinois. Data were collected and regressions were run for 2 years, 1974 and 1975. Nitrate nitrogen concentrations in the spring of each year were regressed on estimated nitrogen fertilizer use per hectare of watershed in the previous crop or calendar year and variables representing other aspects of agronomic practice and hydrologic features. The fertilizer data were collected by surveying approximately 300 farmers. Nitrate nitrogen concentrations were measured at 4-week intervals. The regression results are not clear-cut but lend support to nitrogen fertilizer use as an important explanatory variable for variations in nitrate nitrogen concentrations.

Key Words: nonpoint pollution • nitrate nitrogen

¹ This work was supported by the National Science Foundation, Grant no. AEN 73-07848 A03. Any opinions, findings, conclusions, and recommendations expressed in this paper are those of the author and do not necessarily reflect the views of the National Science Foundation.

² Research Associate, Center for the Biology of Natural Systems, Washington Univ., St. Louis, MO 63130.

Received for publication August 16, 1976.

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