Effect of different magnetized water irrigation on photosynthetic parameters of cotton. (A) Pn, (B) Gs, (C) Ci, (D) Tr, (E) SPAD. The box boundaries indicate the 25th and 75th percentiles, the lines in the boxes mark the median, and lines below and above the boxes indicate the 10th and 90th percentiles, respectively. F and B represent fresh water and brackish water, respectively. Pn represents the net photosynthetic rate, Gs represents the stomatal conductance, Ci represents the intercellular CO2 concentration, and Tr represents the transpiration rate. Different lowercase letters indicate significant difference at p < 0.05.