Effects of salinity and nutrient on leaf gas exchange of old seedlings.

<p>Physiological parameters include <i>P_n</i>, <i>T_r</i>, <i>g_s</i> and WUE. Mean and SD of three replicates are shown, and means at the same nutrient level with different letters are significantly different at 0.05 according to 1-way ANOVA test. HN: high nutrient, fertilized with 1.0 strength Hoagland nutrient solution; LN: low nutrient, unfertilized.