Figure 10

Leaf, stem, and root K/Na ratios of cotton plants under different types of salt–alkali stress: (a) NaCl (CS), (b) Na₂SO₄ (SS), and (c) Na₂CO₃ + NaHCO₃ (AS). Columns with bars represent the mean ± standard error (n = 3). Asterisks indicate a significant difference between the control (CK) and the salt–alkali stress (**p < 0.01).