Fig. 3. Relationship between leaf stomatal conductance (g_l) and photosynthesis rate (P_n) levels at midday in marguerite (A. coronopifolium) plants under control (P_n = 0.04g_l + 3.45; r² = 0.84, significant at the 0.001 probability level [***]), S1 (P_n = 0.04g_l + 0.70; r² = 0.96***), S2 (P_n = 0.02g_l + 1.54; r² = 0.87***), and S3 treatments (P_n = 0.01g_l + 4.15; r² = 0.75***) during the experimental period.