*3.3. Leaf Gas Exchange Elements*

This study showed that gas exchange elements were enhanced by the application of 10 mg L−<sup>1</sup> V treatment; in contrast, a higher application of V (25, 50, and 75 mg L−1) showed a negative effect on the gas exchange elements of sweet potato leaves in comparison to the control plant (Figure 3). Comparing the 10 mg L−<sup>1</sup> V-treated group to the control group, the transpiration rate (Tr), photosynthesis rate (Pn), stomatal conductance (Gs), and intercellular CO2 (Ci) increased by 10.6%, 23.9%, 33.2%, and 0.8%, respectively (Figure 3). Conversely, maximum reductions of 65.4%, 76.5%, 61.8%, and 62.8% were noticed in the Tr, Pn, Gs, and Ci, respectively when compared to the control (Figure 3).
