Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/75081
Type: Artigo de periódico
Title: The effect of the herbicide diuron on soil microbial activity
Author: Prado, AGS
Airoldi, C
Abstract: The inhibitory effect of the herbicide diuron [3-(3,4-dichlorophenyl)-1,1-dimethylurea] on microbial activity in red Latosol soil was followed using microcalorimetry. The activity of the microorganisms in 1.50 g of soil sample was stimulated by addition of 6.0 mg of glucose and 6.0 mg of ammonium sulfate under 35% controlled humidity at 298.15 (+/- 0.02) K. This activity was determined by power-time curves that were recorded for increasing amounts of diuron, varying from zero to 333.33 mug g(-1) soil. An increase in the amount of diuron in soil caused a decrease of the original thermal effect, to reach a null value above 333.33 mug g(-1) of herbicide. The power-time curve showed that the lag-phase period and peak time increased with added herbicide. The decrease of the thermal effect evolved by micro-organisms and the increase of the lag-phase period are associated with the death of microbial populations caused by diuron, which strongly affects soil microbial communities. (C) 2001 Society of Chemical Industry.
Subject: pesticide
toxicity
soil
micro-organisms
microcalorimetry
Country: Inglaterra
Editor: John Wiley & Sons Ltd
Rights: fechado
Identifier DOI: 10.1002/ps.321
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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