Figure 5.

Initial fluorescence (Fo) (a,b), maximum fluorescence (Fm) (c,d), and quantum efficiency of photosystem II (Fv/Fm) (e,f) in common bean plants cultivated without water deficit (WWD, 80% of the water retention capacity—WRC), with moderate water deficit (MWD, 60% of WRC), and with severe water deficit (SWD, 40% of WRC), the plants were subjected to four doses of Si (0, 4, 8, and 12 kg ha⁻¹) via fertigation, with and without potassium fertilization. Letters indicate significant differences among water regimes (WR) at each Si dose (p < 0.05, Tukey’s test). * and **Indicate significance at the 1% and 5% probability levels, respectively, while ns indicates no significance based on the F test.