Effect of herbicides on nitrogen fixation (C 2H 2 reduction) associated with rice rhizosphere

In a field study nitrogenase activity associated with rice rhizosphere was differently influenced by the applied herbicides. Pretilachlor at two application levels had no effect on nitrogenase activity while butachlor and benthiocarb exerted marginal stimulation. Cinmethylin consistently stimulated...

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Bibliographic Details
Published in:Chemosphere (Oxford) 1995, Vol.30 (2), p.339-343
Main Authors: Patnaik, G.K., Kanungo, P.K., Moorthy, B.T.S., Mahana, P.K., Adhya, T.K., Rajaramamohan Rao, V.
Format: Article
Language:English
Subjects:
2,4-D
acetylene
anilofos
Animal, plant and microbial ecology
Applied ecology
Azospirillum
Azospirillum - drug effects
Azospirillum - growth & development
Azotobacter
Azotobacter - drug effects
Azotobacter - growth & development
Biological and medical sciences
butachlor
cinmethylin
Ecotoxicology, biological effects of pollution
enzyme activity
Fundamental and applied biological sciences. Psychology
herbicide residues
Herbicides - pharmacology
nitrogen fixation
Nitrogen Fixation - drug effects
Nitrogen Fixation - physiology
nitrogen-fixing bacteria
nitrogenase
Nitrogenase - drug effects
Nitrogenase - metabolism
Oryza - microbiology
Oryza sativa
pretilachlor
reduction
rhizosphere
Terrestrial environment, soil, air
thiobencarb
toxicity
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Summary:In a field study nitrogenase activity associated with rice rhizosphere was differently influenced by the applied herbicides. Pretilachlor at two application levels had no effect on nitrogenase activity while butachlor and benthiocarb exerted marginal stimulation. Cinmethylin consistently stimulated nitrogenase activity throughout the plant growth period. Anilofos when applied singly had no substantial effect on nitrogenase activity but in combination with 2,4-D the activity was enhanced. Populations of anaerobic nitrogen-fixing bacteria and Azospirillum sp. and Azotobacter sp. were stimulated in such a combination.
ISSN:0045-6535
1879-1298
DOI:10.1016/0045-6535(94)00401-F