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Nitrate Movement in a Chilean Agricultural Area Irrigated with Untreated Sewage Water¹

ABSTRACT

Nitrate concentrations in soils and drainage and well waters were determined in a 15-ha field representing about 4,000 ha of agricultural land irrigated exclusively with raw sewage water for > 25 years. Analyses of the percolating water below the root zone indicated that the leached NO₃^–-N was about 350 kg/ha per year. The transit time for water to move through the unsaturated zone to the saturated zone at a depth of 2 to 2.2 m was < 1 year, and the leaching fraction was estimated as 0.63. Concentrations of NO₃^–-N ranged from 20 to 35 mg/liter in the percolating water of the unsaturated zone, whereas two well waters contained 9 and 14 mg/liter.

Key Words: nitrate leaching • leaching fraction • transit time • vegetable crops • unsaturated zone

¹ Contribution from the Dep. of Inorganic and Analytical Chemistry, Facultad de Ciencias Quimicas, Universidade Chile, Casilla 233, Santiago-Chile. Financial support of the joint IAEA/FAO/GSF Program, Contract no. 1727/PI/GS, and of the University of Chile, Grant no. 3446, are gratefully acknowledged. The present work was also supported by a project of the binational NSF-CONICYT Program.

² Professor, Associate Professors, and Research Assistant, respectively.

Received for publication October 25, 1977.

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