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Ion-selective electrodes frequently require sufficient stabilization time that limits the achievable frequency of soil sampling. This research involves the evaluation of the response curves of ion-selective electrodes and the development of an algorithm for predicting electrode output based on the initial response. The electrode output was logged at 5 Hz. Electrode responses logged for 60 s were analyzed. The prediction of the value at 60 s was attempted from the initial 10 s output. Three combination pH electrodes with different designs of sensitive and reference parts were evaluated. The standard errors of prediction were 4.5, 2.4, and 2.6 mV (0.08, 0.04, and 0.04 pH) for electrodes 1, 2, and 3, respectively. The algorithm developed can be incorporated into a data acquisition system for mapping soil pH on-the-go.