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Salinity is a limiting factor in plant growth. The combination of water high in soluble salts and water-soluble fertilizers can induce salt damage in plants. The objective of this work was to investigate the effects of salinity in irrigation water on optimal fertilization rates in  Spathiphyllum  `Petite'. The combination of 5 levels of fertilizers and 5 salinity levels were tested. Maximum growth was observed at 250 mg l -1  N and no salts, and with 2000 mg l -1  salts at 125 mg l -1  N. As salt levels increased, height and leaf area decreased. Tissue calcium, sodium, and chloride increased with increasing levels of salinity. Tissue nitrogen, phosphorus, and potassium generally increased with increasing levels of fertilizers, and were not affected by salinity level. It is possible that high sodium and chloride concentrations in leaves, petioles, and roots produced an ion toxicity.

INFLUENCE OF IRRIGATION WATER SALINITY ON OPTIMAL NITROGEN, PHOSPHORUS, AND POTASSIUM FERTILIZER RATES ON SPATHIPHYLLUM `PETITE'.