Seleção de espécies bioindicadoras para uso em bioensaios de lixiviação e persistência de atrazina no solo

SELECTION OF BIOINDICATORS FOR USE ON LEACHING AND PERSISTENCE OF ATRAZINE IN SOIL BIOASSAYS The present work aimed to select cultivated species with potential to act as bioindicators of atrazine presence on persistence leaching assays. The experiment was conducted at a completely randomized design with four replications in a factorial scheme 5 x 6, being the A factor consisted of atrazine concentrations WG formulatios (0, 150, 300, 600, atrazine 1200 g ha-1) and B factor by bioindicators species: oat, wheat, okra, tomatoes, peas and radish. The herbicide was applied in pre emergence of the species in a clay soil. It were performed four evaluations of plant stature and injury and at the end were evaluated fresh and dry matter of the shoots. Overall, the experiment allowed to classify the species according to their level of sensitivity to atrazine: okra and peas showed little sensitivity, oats and wheat had an intermediate sensitivity, while the tomato and radish had the highest sensitivity level. KEY-WORDS: ATRAZINE; BIOINDICATOR SPECIES; BIOASSAY; LEACHING; PERSISTENCE.