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Nitrogen Balances for an Effluent Irrigation Area¹

ABSTRACT

An 8.5-ha pasture irrigated with secondary sewage effluent was studied to determine the fate of N applied in the effluent. Soils of the Corralitos series (Typic Xeropsamment) at nine plots were sampled twice to evaluate the spatial and temporal variations in the field water contents and NO₃-N and Cl concentrations in the unsaturated zone below the root zone. Field water contents varied in space but not in time. Mean NO₃-N concentrations in the soil solution ranged from 15.4 to 32.4 mg liter^–1 and varied significantly in space and time. Mean Cl concentrations varied in a similar manner. Averages of N balances developed for three of the nine plots attributed 32, 60, and 9% of the N applied in the effluent to crop removal, leaching, and gaseous losses, respectively.

Key Words: leaching • ammonium • denitrification

¹ Contribution of the Dep. of Soil and Environ. Sci., Univ. of Calif., Riverside, CA 92521. Financial support by the Kearney Foundation of Soil Science and the Dep. of the Army through grant DACA 89-78-G-008.

² Associate Professor, Professor, and Staff Research Associates, respectively, Univ. of Calif., Riverside.

Received for publication September 8, 1980.