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Nitrogen fixation (C2H2 reduction) in the rice rhizosphere soil as influenced by pesticides and methods of their application

Published online by Cambridge University Press:  27 March 2009

J. L. N. Rao ,
I. C. Pasalu  and
V. Rajaramamohan Rao
J. L. N. Rao
Affiliation:
Division of Soil Science and Microbiology, Centred Rice Research Institute, Cuttack 753006, India
I. C. Pasalu
Affiliation:
Division of Soil Science and Microbiology, Centred Rice Research Institute, Cuttack 753006, India
V. Rajaramamohan Rao
Affiliation:
Division of Soil Science and Microbiology, Centred Rice Research Institute, Cuttack 753006, India
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Summary

The effect of pesticides on nitrogenase activity in rhizosphere soil from rice fields was investigated. The differential response of insecticides on nitrogenase depended on the method of field application. Results also showed that the differential response to the pesticides of. specific groups of nitrogen-fixing micro-organisms depended upon the method of application.

Soil incorporation of carbofuran stimulated the rhizosphere nitrogenase, while endosulfan and hexachlorocyclohexane inhibited it. Carbofuran and hexachlorocyclohexane stimulated nitrogenase when applied to the standing water. Seedling root dips of isofenphos stimulated nitrogenase, while endosulfan, BPMC and carbaryl showed a variable effect. Quinalphos inhibited nitrogenase irrespective of method of application.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 100 , Issue 3 , June 1983 , pp. 637 - 642
Copyright
Copyright © Cambridge University Press 1983

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