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Generally, the life cycle of plants depends on the uptake of essential nutrients in a balanced manner and on toxic elements being under a certain concentration. Lack of control of nutrient levels in nutrient solution can result in reduced plant growth and undesired conditions such as blossom‐end rot. In this study, sensitivity and selectivity tests for various polyvinylchloride (PVC)‐based ion‐selective membranes were conducted to identify those suitable for measuring typical concentration ranges of macronutrients, that is, NO³⁻, K⁺, and Ca²⁺, in hydroponic solutions. The sensitivity and selectivity of PVC‐membrane‐based ion‐selective sensors prepared with tetradodecylammoniumnitrate for NO³⁻, valinomycin for K⁺, and Ca ionophore IV for Ca²⁺ were found to be satisfactory for measuring NO³⁻, K⁺, and Ca²⁺ ions in nutrient solutions over typical ranges of hydroponic concentrations. Potassium, calcium, and …