Fig. 6

Principal component analysis of variables related to concentrations and accumulations of C, N, P, and Si, stoichiometric ratios of C:N:P:Si, use efficiency of C, N, and P and dry mass partition in leaves (a, c, e) and stems (b, d, f) of sugarcane plants in two water deficit conditions (presence: 35%, and deficit: 70% of water retention) combined with absence (0.0 mmol L⁻¹) and presence of fertigated Si (1.8 mmol L⁻¹) in three tropical soils (Quartzarenic Neosol; Eutroferric Red Latosol; and Dystrophic Red Latosol). CUE: C use efficiency; NUE: N use efficiency; PUE: P use efficiency