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Nitrate Concentrations in the Unsaturated Zone Beneath Irrigated Fields in Southern California¹

ABSTRACT

Nitrate concentrations in the drainage water of the unsaturated zone beneath the soil-root zone were predicted from data for N inputs, N removal in harvested crops, and the drainage volume. Ratios of these predicted values to measured values were related to the volatilization losses or unaccounted-for inputs expressed as a fraction of the excess N defined as the N input minus N removal in harvested crops. Volatilization losses or unaccounted-for inputs were calculated as known inputs minus removal in harvested crops minus that removed from the soil-root system by leaching.

¹ Contribution from the Dep. of Soil Sci. and Agr. Eng., Univ. of California, Riverside 92502. Monetary assistance from the Water Quality Office of the Environmental Protection Agency, through Grant No. 16060 DOE, Kearney Foundation of Soil Sci. of the Univ. of California, and the National Science Foundation through Grant No. GI-34733X is gratefully acknowledged.

² Professor of Soil Science and Postdoctoral Fellow, respectively.

Received for publication August 21, 1972. Accepted for publication November 22, 1972.