SPAD index and leaf pigments in cauliflower in different water conditions and silicon fertilization

The measurement of leaf pigments using non-destructive methods can be influenced by water management conditions and the use nutrients in cauliflower, not showing adequate correlations with chlorophyll contents. objective this study was to evaluate correlation between SPAD index pigment content cauliflower leaves managed different application silicon (Si). cultivation carried out a protected environment city Maringá, Paraná State from October 2019 March 2020. It adopted randomized block design, treatments 3 x 4 factorial scheme, three levels recharge (40; 70 100% crop evapotranspiration (ETc)) four doses Si (0; 50; 100 150 kg ha-1), replications. Once plants showed developed inflorescence, determined field a, b, carotenoids laboratory upper third. fertilization on determined. proportion relation total compared under conditions. Correlation analysis performed considering fertilization, recharge, pigments, index. Silicon reduced addition being related (100% ETc) b (70% ETc). is variable condition crop, without deficit, it 70% replacement ETc, correlated b.