This study aimed at evaluating the seedling performance of angico-branco (Anadenanthera colubrina (Vell.) Brenan), under different conditions of phosphorus availability and variable levels of base saturation. The treatments were represented by a 6 (P doses: 0, 100, 200, 300, 400 and 500 mg/dm³) by 5 (percentage of basis saturation: original, 40, 50, 60 and 70%) factorial arrangement, distributed in randomized blocks with five replications. 170 days after sowing, stalk height and diameter of all "angico-branco" plants were measured, finishing the experiment. The addition of corrective mixed to substrate did not show significant response on the species studied. This absence of response can be related to the fact that the levels of Ca (0,9 cmol c/dm³) and Mg (0,4 cmol c/dm³) in the soil used, might be efficient to supply the needs of the plants in that phase. However, it was observed that "angico-branco" responded positively to P fertilization. P doses that leaded to 90% of the maximum dry matter production were 127 mg/dm³ on 40% base saturation and 126 mg/dm³ on 60% base saturation.According to the adjusted model for recorred P, relative to addedP; the dose that lead to available P at todays were 976,2 mg/dm³ ,with V=40% and 1277,3 mg/dm³ ,with V=60%. The critical P level at V=40% and V=60% were 13,88 and 12,87 mg/dm³ in the soil and 0,14 and 0,12 dag/kg on the shoot, respectively.
Anadenanthera colubrina; "angico-branco"; base saturation; phosphorus
