Effect of glyphosate on the microbial activity of two Brazilian soils.

Abstract:

:Glyphosate [N-(phosphonomethyl)-glycine] is a broad-spectrum, non-selective, post-emergence herbicide that is widely used in agricultural. We studied, in vitro, changes in the microbial activity of typical Hapludult and Hapludox Brazilian soils, with and without applied glyphosate. Glyphosate was applied at a rate of 2.16 mg glyphosate kg(-1) of soil and microbial activity was measured by soil respiration (evolution of CO(2)) and fluorescein diacetate (FDA) hydrolysis over a period of 32 days. We found an increase of 10-15% in the CO(2) evolved and a 9-19% increase in FDA hydrolyses in the presence of glyphosate compared with the same type of soil which had never received glyphosate. Soil which had been exposed to glyphosate for several years had the strongest response in microbial activity. Most probable number (MPN) counts showed that after 32 days incubation the number of actinomycetes and fungi had increased while the number of bacteria showed a slight reduction. After the incubation period, high pressure liquid chromatography (HPLC) detected the glyphosate metabolite aminomethyl phosphonic acid (AMPA), indicating glyphosate degradation by soil microorganisms.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Araújo AS,Monteiro RT,Abarkeli RB

doi

10.1016/S0045-6535(03)00266-2

subject

Has Abstract

pub_date

2003-08-01 00:00:00

pages

799-804

issue

5

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(03)00266-2

journal_volume

52

pub_type

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