Abstract: Growth and photosynthetic pigment content of Suaeda salsa seedlings under different salinity and nitrogen levels were studied by an experiment of potted plant. The results are as follows: ① Moderate applications of nitrogen (0.3 g·kg^-1, 0.6 g·kg^-1and 1.2 g·kg^-1) could promote the growth of S. salsa seedlings under slight, moderate severe salt levels, and the effect of nitrogen application on the growth of S. salsa seedlings was related to the salinity under high salinity and nitrogen levels; ② Under different salinity levels, the highest dry matter yield of S. salsa seedlings, achieved by applying nitrogen, was different, it was in an order of slight salt level (NaCl content of 2.5 g·kg^-1) > moderate salt level (NaCl content of 5 g·kg^-1) > severe salt level (NaCl content of 7.5 g·kg^-1), and the nitrogen productivity was decreased with the increase of nitrogen application; ③ At the same nitrogen level, the leaf osmotic potential of S. salsa seedlings was significantly decreased with the increase of salinity and nitrogen application, and the osmotic regulation capability was increased; ④ At three salinity levels, the photosynthetic pigment content of S. salsa seedling leaves could be increases by applying nitrogen, thus the photosynthetic efficiency could be improved, and the adaptability of S. salsa seedlings to saline or alkaline environment could be increased.

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