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The extent to which calcium, magnesium, sodium, potassium and hydrogen ions independently mitigate Cu rhizotoxicity to wheat (Triticum aestivum) in nutrient solutions was examined. Increasing activities of Ca 2+ and Mg 2+ but not Na + , K + and H + linearly increased the 2 d EC50 (as Cu 2+ activity), supporting the concept that some cations can compete...
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