Some observations on the assimilation of atmospheric nitrogen by a free living soil organism Azotobacter Chroococcum of Beijerinck

A - Papers appearing in refereed journals

Ashby, S. F. 1907. Some observations on the assimilation of atmospheric nitrogen by a free living soil organism Azotobacter Chroococcum of Beijerinck. The Journal of Agricultural Science. 2 (1), pp. 35-51.

AuthorsAshby, S. F.
Abstract

Some years before the appearance of Hellriegel and Wilfarth's work on the sources of nitrogen of leguminous plants, and while the part played by atmospheric nitrogen in the nutrition of crops was under active discussion, Berthelot was making some exact observations on the behaviour of uncropped soils towards the free element. He found that when 50 kilograms of air-dry arable soil were exposed to the air and rain in a vessel for seven months a great increase in the nitrogen content could be observed; the total nitrogen of the original soil had increased from 50 grams to 63, or a gain of over 25 per cent, after allowing for the small amount of combined nitrogen brought down by rain; in another experiment where the soil had first been washed free from nitrates, a gain of 46 per cent, of nitrogen was proved. In many other cases, however, the gain was only from 10–15 per cent, of the original nitrogen present in the soil.

Year of Publication1907
JournalThe Journal of Agricultural Science
Journal citation2 (1), pp. 35-51
Digital Object Identifier (DOI)doi:10.1017/S0021859600000988
Open accessPublished as non-open access
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Output statusPublished
Publication dates
Print01 Jan 1907
PublisherCambridge University Press (CUP)
ISSN0021-8596

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