Fig. 1

The change of net photosynthetic assimilation rate (A_net—µmol CO₂ m⁻² s⁻¹) to water stress condition (55–50% soil moisture, moderate, a–d) and different silicon levels (e–h) in sugarcane (Saccharum officinarum L. cv. GT 42) plants. Average mean values are each point (n = 5). Blue ovals denote the actual values and red lines show the predicted values. Parenthesis values indicate ( +) percent gain. S = standard error and r = correlation coefficient