Fig. 4.

Phosphorus use efficiencies (a, b) and dry mass partition (c, d) in leaves and stems of sugarcane plants in two water deficit conditions (presence: 35%, and absence: 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). ** and *: significant at 1% and 5% probability, respectively; NS = not significant at 5% probability. Different uppercase letters indicate differences in water deficit and different lowercase letters indicate differences in Si fertigation by Tukey test (p < 0.05)