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O objetivo deste trabalho foi avaliar o acumulo dos metais toxicos Cd, Pb, e Cr no solo de cultivo e no tecido vegetal da cultura da Tifton 85 ( Cynodon dactylon ) fertilizada com dejetos de suinos. O experimento foi implantado em ambiente protegido utilizando-se um Argissolo Vermelho distrofico (PVd) de textura arenosa e um Latossolo Vermelho eutroferrico (LVef ) de textura argilosa. Os tratamentos foram constituidos por duas fontes de dejetos suinos ( in natura e biofertilizante), com quatro doses (0, 200, 400 e 600 m³ ha -1 ) para cada fertilizante e quatro repeticoes. Nao foram detectadas concentracoes de Cd no tecido foliar e solo avaliado. O uso do biofertilizante proporcionou maior acumulo de Cr no tecido vegetal, quando comparado ao uso do dejeto in natura . Os valores totais obtidos para o Pb no LVef e no PVd ficaram acima do valor atribuido pela CETESB como indicador de qualidade no solo. Para o Cr, os valores obtidos nos dois solos foram considerados abaixo do valor limite usados como referencia de qualidade para o solo. A partir dos resultados, pode-se inferir que houve incremento dos metais toxicos nas plantas e no solo em funcao das doses aplicadas, demonstrando que aplicacoes sucessivas com altas dosagens de dejetos suinos podem acarretar em contaminacao ambiental. Abstract The objective of this work was to evaluate the accumulation of the heavy metals Cd, Pb and Cr in soil cultivation and in the plant tissue of the Tifton 85 ( Cynodon dactylon ) culture fertilized with swine manure. The experiment was performed in protected environment using a Dystrophic Red Argisoil (PVd) with sandy texture and an Eutrophic Red Latosol (LVef ) with clay texture. The treatments were composed by two sources of swine manure (in natura and biofertilizer), with four doses (0, 200, 400 e 600 m³ ha -1 ) for each fertilizer and four replications. Concentrations of Cd were not found in the plant tissue and in the evaluated soil. The use of the biofertilizer provided higher accumulation for Cr in the plant tissue when compared to the use of the manure in natura. The obtained values for Pb in the Dystrophic Red Argisoil (PVd) and in the Eutrophic Red Latosol (LVef ) were above the value assigned by CETESB as indicator of soil quality. For the Cr, the obtained values in the two soils were considered below the limit values used as a reference of quality for the soil. The results demonstrate that there was increase of the heavy metals in the plants and in the soil given the applied doses, demonstrating that the successive applications with higher doses of swine manure can result in environmental contamination.

Availability of heavy metal in Tifton 85 fertilized with manure from swine