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Nitrogen and Phosphorus in Tile Drainage Effluent¹

ABSTRACT

Tile drainage effluent from systems on irrigated land in the San Joaquin Valley of California was analyzed for nitrogen and phosphorus and the quantity of each element found was correlated with the quantity of N and P applied for four different cropping patterns. Large percentages of applied N were found to be lost in tile drainage effluent. Phosphorus losses were not significant.

¹ Joint contribution, Department of Irrigation and Soil Science and the Water Resources Center, University of California, Los Angeles, California, and the State Department of Water Resources, Sacramento.

² Associate Specialist, (Irrigation and Drainage) University of California, Los Angeles; Assistant Civil Engineer, California State Department of Water Resources, Fresno; Water Resources Engineering Associate, California State Department of Water Resources, Sacramento; and Professor of Irrigation and Engineering, University of California, Los Angeles, respectively.

Received for publication September 28, 1964. Accepted for publication December 1, 1964.