Figure 2.

Effect of KI on gas exchange attributes of soybean plants under well-watered conditions (blue columns, on the left) and water deficit (red columns, on the right) one day after rehydration. (A) A—CO₂ assimilation rate, (B) g_s—stomatal conductance, (C) E—transpiration, (D) C_i—internal CO₂ concentration, (E) WUE—water use efficiency, and (F) CE—carboxylation efficiency. Values are presented as average  ±  SD (n  =  5). Equal letters indicate no significant differences calculated using the Tukey test (p  >  0.05). Different uppercase letters indicate differences between KI concentrations, while distinct lowercase letters indicate differences between irrigation conditions. Graphs represented in the boxplot indicate that the data did not meet the assumptions of normality and homogeneity of variance, requiring a transformation by rank.