Fig. 5. Relationship between relative water content (RWC) and photosynthesis rate (Pn) levels at midday in marguerite (A. coronopifolium) plants under control (Pn = 0.98RWC - 75.35; r2 = 0.92, significant at the 0.001 probability level [***]), S1 (Pn = 0.60RWC - 43.74; r2 = 0.79***), S2 (Pn = 0.39RWC - 30.30; r2 = 0.80***), and S3 treatments (Pn = 0.31RWC - 20.54; r2 = 0.61***) during the experimental period.