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Type: Artigo de periódico
Title: The Effect Of The Herbicide Diuron On Soil Microbial Activity.
Author: Prado, A G
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 micro-organisms 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 micrograms 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 micrograms 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.
Subject: Ammonium Sulfate
Dose-response Relationship, Drug
Soil Microbiology
Soil Pollutants
Rights: fechado
Identifier DOI: 10.1002/ps.321
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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