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To study the combined effects of multiple nitrogen (N) sources and salinity on the growth and physiology on macroalgae, we cultured Ulva prolifera under three N levels (N0, 0.1235 mg L−1; N1, 0.6 mg L−1; and N2, 4.4 mg L−1; the ratios were 18:74:8 for NH4–N, NO3–N, and NO2–N, respectively) and three salinity conditions (15, 25, and 35). Then, the growth, pigment content, photosynthetic performance,...