Only a decrease in the level of Ca, Mg and Fe (in roots of plants grown in the nutrient medium containing 0 mg I dm−3, 0.5 mg Se + 1.0 mg I dm−3 or 1.5 mg Se + 1.0 mg I dm −3 and foliarly treated with KIO3
or Na2SeO4+ KIO3) indirectly indicates that simultaneous application of selenium and iodine may impair the functioning of mineral nutrition in plants