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Effect of metolachlor on azotobacter nitrogen fixation in soil
Author(s) -
MartinezToledo Maria V.,
GonzalezLopez J.
Publication year - 1989
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620080906
Subject(s) - azotobacter chroococcum , azotobacter , nitrogenase , diazotroph , nitrogen fixation , inoculation , chemistry , nitrogen , agronomy , azotobacteraceae , metolachlor , biology , horticulture , pesticide , bacteria , atrazine , genetics , organic chemistry
The effect on nitrogen fixation of 100, 200, 300, 400 and 500 μg metolachlor per gram of soil was studied in nonsterile soil incubated under aerobic conditions and sterilized soil inoculated with Azotobacter chroococcum . Metolachlor at concentrations of 400 and 500 μg/g significantly reduced dinitrogen fixation in nonsterile soil and sterile soil inoculated with Azotobacter sp. However, this inhibitory effect on nitrogenase activity disappeared after 24 h, showing that acrobic diazotrophs populations present in the soil can tolerate high concentration of this herbicide without significant changes in their nitrogenase activity.