Figure 4.

Chlorophyll a content (Chl a) (a,b), chlorophyll b content (Chl b) (c,d), and carotenoid content (e,f) in common bean plants cultivated under well-watered conditions—WWD (80% of water retention capacity—WRC), moderate water deficit—MWD (60% of WRC), and 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.