The seeds of the forest species 'timbauva' (Enterolobium contortisiliquum (Vell.) Morong), 'pata-de-vaca' (Bauhinia forficata Link) and 'amendoim-bravo' (Pterogyne nitens Tul) were subjected to the overcoming of tegument dormancy through mechanical scarification on the opposite side of the hilum, using a Norton 80 sandpaper.
'Pata-de-vaca' and 'amendoim-bravo' showed linear reduction in TDM with the Cu doses, while 'timbauva' showed maximum TDM at the Cu dose of 118 mg [kg.sup.-1] (Figure 1A).
'Pata-de-vaca' and 'amendoim-bravo' showed a significant increment in the CuR and CuS, compared with 'timbauva' at the highest Cu doses in the soil (Figure 1B, C and Table 2).
The results evidence the increase in CuAR until Cu doses of 250, 190 and 180 mg [kg.sup.-1] for 'timbauva, 'pata-de-vaca' and 'amendoim-bravo, respectively (Figure 1D and Table 2).
However, for 'pata-de-vaca' (y = 4.44 + 0.18x - 0.00008[x.sup.2]) and 'amendoim-bravo' (y = 6.25 + 0.011x - 0.00003[x.sup.2]), the index of determination was very low (0.47 and 0.08, respectively) and precise considerations were not possible (Figure 1E and Table 2).
The index of translocation (ITRA) decreased with the increase in Cu doses applied to the soil, with minimum point at 223, 207 and 165 mg [kg.sup.-1] of soil for the seedlings of 'timbauva, 'pata-de-vaca' and 'amendoim-bravo, respectively (Figure 1F), and was statistically higher in 'amendoim-bravo' at high Cu doses (Table 2).
Cu doses reduced the index of tolerance (ITOL) in the three forest species (Figure 2A), while 'timbauva' was significantly more tolerant compared with 'pata-de-vaca' and 'amendoim-bravo' (Figure 2C).