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Denitrification in soil. I. Methods of investigation

Published online by Cambridge University Press:  27 March 2009

J. M. Bremner  and
K. Shaw
J. M. Bremner
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts
K. Shaw
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts
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Extract

1. Methods of investigating denitrification in soil are critically discussed with special reference to methods based on total-N analysis.

2. A modified Kjeldahl method of determining nitrogen which includes nitrate and nitrite and is applicable to waterlogged soil is described and the use of this method in studies on denitrification in soil is illustrated and discussed.

3. It is shown that rapid denitrification of nitrate in soil can be induced by incubating the soil under waterlogged conditions with organic materials such as glucose and that denitrification can be followed by total-N analyses if the organic material used to induce denitrification is not added in such excess that it also promotes significant fixation of atmospheric nitrogen.

4. The percentage of added nitrate-N lost by denitrification on incubation of waterlogged soils with different amounts of nitrate and sufficient glucose for denitrification was found to be the same whatever the level of application of nitrate.

5. Denitrification of nitrate in waterlogged soil containing glucose was found to be accompanied by a rapid but temporary accumulation of large quantities of nitrite and by the formation of smaller amounts of ammonia. Hydroxylamine could not be detected during denitrification, but it was found that this compound was rapidly decomposed in the soils examined by a process which appeared to be purely chemical.

6. It is shown that denitrification of nitrate in soil is a microbiological process and that the viability of the micro-organisms responsible for denitrification is not affected by air-drying and storage of the soil.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 51 , Issue 1 , August 1958 , pp. 22 - 39
Copyright
Copyright © Cambridge University Press 1958

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