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O arsenio e o elemento quimico nocivo a saude humana. A recuperacao de areas com presenca de As requer utilizacao de especies tolerantes e manejo adequado da adubacao, especialmente do fosforo (P). Assim, o objetivo deste trabalho foi avaliar a interacao de doses As e P no desenvolvimento de mudas florestais inga e angico-vermelho. O delineamento foi em blocos casualizados, em esquema fatorial 5 x 3, sendo 5 doses de As (0, 100, 200, 400 e 800 mg dm -3 ) e 3 doses de P (0, 150 e 450 mg dm -3 ) com tres repeticoes. As variaveis analisadas foram materia seca, altura e diâmetro das plantas e analise do nectar produzido pelas plantas. Aos 10 dias de cultivo as plantas de inga apresentaram intoxicacao com clorose internerval, seguida de necrose, nas doses de 400 e 800 mg dm -3 de As e na ausencia de P. Por outro lado, as doses crescentes de arsenio, mesmo na presenca do P, contribuiram para reduzir a producao de materia seca de raizes e parte aerea, altura e diâmetro de planta. As plantas de angico apresentaram-se mais tolerantes que as de inga. Na avaliacao do nectar coletado constatou-se que tais especies podem absorver, transportar e eliminar arsenio por meio dos nectarios foliares. Maiores teores de As no nectar foram encontrados em angico-vermelho (40,50 mg kg -1 ), enquanto o inga apresentou teor medio de 3,24 mg kg -1 , para a combinacao 100 mg dm -3 de As e ausencia de P, ambos valores acima do permitido em mel para consumo humano. A B S T R A C T Arsenic (As) is the chemical element most harmful to human health. Rehabilitation of areas with As presence requires the use of tolerant species and adequate fertilization management, especially phosphorus (P). Therefore, this work aims to evaluate the As and P interaction in the seedlings development of species inga ( Inga edulis Mart.) and angico-vermelho [ Anadenanthera peregrina (L.) Speg.]. The experimental design was a randomized complete block, with three replications, in a 5 x 3 factorial scheme. We used 5 doses of As (0, 100, 200, 400 and 800 mg dm -3 ) and 3 doses of P (0, 150 and 450 mg dm -3 ). The analyzed variables were dry matter, height and diameter of the plants and nectar produced by plants. At 10 cultivation days, the inga plants presented the basal leaves margins purplish with internerval chlorosis, followed by necrosis, only at 400 and 800 mg dm -3 of As and in the P absence. This shows P reduces As toxicity to plants, even at high doses. On the other hand, increasing arsenic doses, even in the P presence, contributed to significantly decrease of roots and shoot dry matter production, height and plant diameter. Increasing P doses for each As dose resulted in increased growth variables, especially in angico plants. The As toxic effect varies according to species, taking into account the symptoms of leaf toxicity and the growth variables analyzed. The angico plants were more tolerant than inga. Booth forest species can absorb, transport and eliminate part of the arsenic through the foliar nectaries, probably, as an elimination mechanism of this metalloid. Higher As-levels in nectar were found in angico (40.50 mg kg-1), while the inga presented mean content of 3.24 mg kg -1 , for the combination of 100 mg dm -3 of As and P absence, both values above that allowed in honey for human consumption. Keywords: phytoremediation, arsenate, toxicity, inga, angico

Efeito de doses de fósforo na mobilidade do arsênio e no desenvolvimento de duas essências florestais