INTERFERENCE OF DOSES OF COPPER ON GROWTH AND QUALITY OF Bauhinia forficata Link, Pterogyne nitens Tul AND Enterolobium contortisiliquum Vell. SEEDLINGS

O cobre \ue9 um elemento essencial \ue0s plantas, mas quando presente em altas concentra\ue7\uf5es no solo pode se tornar t\uf3xico ao metabolismo vegetal. Uma das estrat\ue9gias para reabilita\ue7\ue3o de \ue1reas contaminadas por metais \ue9 a fitorremedia\ue7\ue3o, que consiste na introdu\ue7\ue3o de esp\ue9cies vegetais no solo contaminado. O trabalho objetivou avaliar a interfer\ueancia de doses crescentes de cobre aplicadas ao solo no crescimento e na qualidade de mudas de Bauhinia forficata Link, Pterogyne nitens Tul e Enterolobium contortisiliquum Vell. O experimento foi conduzido em casa de vegeta\ue7\ue3o, no delineamento inteiramente casualizado, com oito repeti\ue7\uf5es, em arranjo fatorial (3 x 6), sendo tr\ueas esp\ue9cies florestais e seis doses de cobre no solo (0, 60, 120, 180, 240 e 300 mg kg-1). Foram avaliados os par\ue2metros: altura, di\ue2metro de colo, massa seca a\ue9rea, massa seca radicular, \ue1rea superficial espec\uedfica e \uedndice de qualidade de Dickson. Os resultados evidenciaram que as mudas de timba\ufava s\ue3o mais tolerantes do que as de pata-de-vaca e carne-de-vaca e apresentam melhor qualidade de mudas em doses mais elevadas de cobre. As doses de cobre reduzem com maior intensidade a altura de plantas, massa seca da parte a\ue9rea e ra\uedzes, \ue1rea superficial espec\uedfica e o \uedndice de qualidade de Dickson das mudas de Bauhinia forficata Link e Pterogyne nitens Tul em rela\ue7\ue3o \ue0 Enterolobium contortisiliquum Vell. As mudas de timba\ufava toleram maiores doses de cobre no solo em rela\ue7\ue3o \ue0 pata-de-vaca e \ue0 carne-de-vaca.Copper is an essential element for the plants, but when it\u2019s present in high amounts in soil, it becomes toxic to vegetable metabolism. One of the strategies for rehabilitation of contaminated areas by metals is the phytoremediation, which consists in the introduction of vegetable species on contaminated soil. The research aimed to evaluate the interference of increasing doses of copper, applied in soil, on growth and on quality of seedling of Bauhinia forficata Link, Pterogyne nitens Tul e Enterolobium contortisiliquum Vell. The experiment was conducted in a greenhouse, completely randomized design, with eight repetitions and in factorial arrangement (3 x 6), which include three forest species and six copper dosages in soil (0, 60, 120, 180, 240 end 300 mg kg-1). It was evaluated the following parameters: height, collar diameter, aerial dry mass, root dry mass, specific surface area and Dickson Quality Index. The results evidenced that the Enterolobium contortisiliquum Vell seedlings are more tolerant than Bauhinia forficata Link and Pterogyne nitens Tul seedlings and they have better quality of seedlings at higher doses of copper. Copper doses reduce with higher intensity plant height, dry mass of aerial and roots parts, specific surface area and Dickson Quality Index of seedlings of Bauhinia forficata Link and Pterogyne nitens Tul in relation to Enterolobium contortisiliquum Vell Seedlings of Enterolobium contortisiliquum Vell are more tolerant to higher copper doses than Bauhinia forficata Link and Pterogyne nitens Tul in soil