Abstract
Adding potassium to the nutrient substrate reduced Cs/sup 137/ and Rb/sup 86/ uptake by bean plants less than expected from an assumed physiological equivalence of these ions. Plants discriminated against cesium at low potassium nutrient concentrations, but with increasing substrate potassium, this discrimination diminished. Discrimination of Rb/sup 86/ from potassium approximated that observed for Cs/sup 137/. Potential errors from the use of ratios in predicting uptake of Cs/sup 137/ were discussed. Some toxicity was noted when significant quantities of non-radioactive cesium were in the nutrient solution.
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