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Sodium Hazard of Bicarbonate Irrigation Waters¹

ABSTRACT

Results of a 6-year lysimeter experiment show that the water quality value based on the precipitation index (PI) for CaCO₃ satisfactorily estimated the effect of the water on the composition of saturation extracts of soil samples, except where Na precipitation occurred. Essential conditions for Na precipitation, presumably as a zeolite, were a pH above 8.6 and time for dissolution of reactants from the soil and/or formation of the product. Tree trunk diameter growth by lemon trees (Citrus limons) and evapotranspiration were linearly correlated with water quality values based on PI.

¹ Contribution from the Department of Soils and Plant Nutrition, University of California, Riverside.

² Professor of Soil Science and Laboratory Technician, respectively.

Received for publication May 5, 1969. Accepted for publication July 16, 1969.