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Guidelines for Molybdenum in Irrigation Waters

Volcani Center, A.R.O., Bet-Dagan, 50-250, Israel;

P. F. Pratt

Dep. of Soil and Environ. Sci., Univ. of California, Riverside, CA 92521.

^* Corresponding author.

ABSTRACT

Molybdenum (Mo) in relatively high concentrations has been found in saline SO^2–₄-dominated agricultural drainage waters of the West Side of the San Joaquin Valley (WSSJV) of California. Because of the potential for using these waters for irrigating salt-tolerant crops, an assessment of quality guidelines for Mo for the specific conditions of the WSSJV was justified. The unique conditions of (i) alkaline soils favoring Mo mobility, (ii) the high leaching fractions required to control salinity in the root zone, and (iii) the effect of SO^2–₄ in reducing Mo absorption by plants suggested that the guideline of 10 µg L^–1 to protect crops and animals be increased to 50 µg L^–1 for the WSSJV. The Mo input at this concentration assuming the use of 10 000 m³ of water ha^–1 will be 0.5 kg h ^–1.

Contribution from the Dep. of Soil and Environ. Sci., Univ. of California, Riverside.

Financial support of the California Water Resources Control Board is gratefully acknowledged.

Received for publication May 14, 1988.