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Zostera noltii. Ammonium (a) and nitrate (b) uptake rates (μmol/g DW/h) of plants leaves exposed to CO2 concentrations of 360 and 700 ppm when incubated at 5 and 30 μM of NH4Cl + KNO3. Values are mean ± SE (n = 6). Different letters denote significant differences.
