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Treatments: Ctrl = control (no nutrient addition); +N = 250 µg N L−1 each of NaNO3 and (NH4)2SO4; +P = 200 µg P L−1 of KH2PO4; +NP = combined N+P addition; Standard light = 100 µmol photons m−2 s−1; In situ light = predicted Imix.
