Estudo do impacto do herbicida Metribuzin sobre o crescimento de bactÃrias mesofÃlicas aerÃbicas de solo virgem

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The microbiot biomass of the ground is the main component of the subsystems decompositores, that regulate the cycles of nutrients, the flow of energy, the productivity of the plants and ecosystems and, therefore, the measurement of this compartment and its activity is excellent for the conservation of ground. The work had as objective to analyze the behavior of the aerobics mesofilic bacteria and the filamentous fungi from soil impacted by the use of the herbicide Metribuzin. The collected samples from soil had been separate in two groups being, one for control (CG) and another impactado (IG). The herbicide Metribuzin was sprayed in 40, 80, 160μl e 1ml concentrations in the samples from soil of the IG for posterior comparison with the CG. The counting standard of microorganisms had been carried through in agreement current law at the moment of the collection of the material. The analyses had followed the methodology praised for the American Public Health Association. The comments of the microscopically characteristics had been carried through using comments a alive and in vitro for the bacteria and the fungi. Graphs with the UFC/ml you counted versus the period of incubation time had been mounted to analyze and to argue the results of the experiments. Os they had shown that in the ground impacted by metribuzin the amount of positive Gram bacteria they had increased (92% IG and 82% CG) while the negative Gram bacteria and the filamentous fungi had diminished (18% CG and 8% IG). In CG and IG 72% of the bacteria they were mobile and 28% property. The herbicide metribuzin revealed a product that if used in adequate way does not offer risks to the health or the environment.

ASSUNTO(S)

solo virgem virgin soil metribuzin metribuzin herbicide quimica dos produtos naturais herbicida

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