Biodegradation, sorption and desorption of 14C-diuron in two brazilian soils amended with sewage sludg. / Biodegradação, sorção e dessorção do herbicida 14C-Diuron em dois Latossolos tratados com lodo de esgoto.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Adding sludge to agricultural soil may modify the behavior of pesticides in the soil. In some cases, the application of organic amendment increases the degradation of pesticides, by providing nutrients and energy to the microorganisms able to degrade the molecule (Felsot &Dzantor, 1990), in other cases, the sorption is increased, resulting in the decrease of leaching potential of the molecule, and smaller bioavailability of the pesticide to the plants and to the microorganisms. In this context, the aim of this work was to evaluate the effect of the sewage sludge on the biodegradation of the diuron herbicide in 2 oxisoils. The biodegradation was evaluated weekly, for 63 days, by methods of the radiorespirometry, under controlled condition of the humidity and temperature. At the end of the incubation, the original compounds and their metabolites were extracted and quantify. Completely randomized design was used with a factorial experiment of 2 (soil ) x 3 (sewage sludge: 0, 10 e 20 ton ha-1). In parallel to this study, were evaluated the microbial activity and biomass, using the same treatments of the biodegradation experiment, but with two factories for herbicide (with and without herbicide).

ASSUNTO(S)

degradation sorption biomassa microbiana latossolo química do solo biodegradação física do solo sewage sludge lodo de esgoto diuron pesticida herbicide

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