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In this experiment, the responses of plant growth, gas exchange parameters, and ion concentration to different levels of irrigation water salinity (EC iw  of 0.9, 1.6, 2.7, 4.7 and 7.0 dS·m −1 ) and leaching fractions (LFs of 0.17, 0.29) were investigated in hot pepper plants. The pot experiment was conducted using a completely randomized block design with four replications in a rain shelter. Results showed that the height of the hot pepper plants decreased as the EC iw  was increased from 25 d after transplanting (DAT) and increased when the LF was increased from 55 DAT. Neither the EC iw  nor the LF influenced the root length. An increase in the EC iw  caused the suppression of the stem diameter (SD); leaf length; leaf area; leaf chlorophyll content (CCI); dry biomass of roots, stems, and leaves; net photosynthesis ( P  n ); stomatal conductance ( g  S ); transpiration rate ( T  r ); and intercellular CO 2  concentration ( C  i ). An increase in the LF caused the SD, leaf length, leaf area, and dry biomass of stems and leaves to increase. However, the dry biomass of roots and the  P  n ,  g  S ,  T  r , and  C  i  were not significantly affected by the LF, except for the  C  i  measured on 23 DAT and the  T  r  on 76 DAT. The Na +  concentrations in the roots and stems increased, whereas the K + /Na +  ratios decreased as the EC iw  increased. An increase in the LF led to a decrease in the Na +  concentration of the roots and stems, whereas there was an increase in the K +  concentration in the stems and the K + /Na +  ratios in the roots and stems. Collectively, an increase in the EC iw  had an adverse effect on plant growth and gas exchange and led to the accumulation of the Na +  concentration in the roots and stems, whereas an increase in the LF enhanced plant growth, leaf transpiration, and K +  concentration and reduced the accumulation of the Na +  concentration in the roots and stems. We suggest that higher quantity of water should be applied in higher saline irrigation for satisfactory performance for hot pepper growth.

Effects of Irrigation Water Salinity on the Growth, Gas Exchange Parameters, and Ion Concentration of Hot Pepper Plants Modified by Leaching Fractions