Question

Asymbiotic nitrogen fixation

Answer 1

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I am smaller than you so I am writing about Asymbiotic nitrogen fixation in soil ...

Abstract Nitrogen fixation, the biological conversion of di-nitrogen to plant-available ammonium, is the primary natural input of nitrogen to ecosystems 1, and influences plant growth and carbon exchange at local to global scales 2, 3, 4, 5, 6.

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Answer 2

Priority of discovery in science has always been difficult to assess, and the field of asymbiotic nitrogen fixation is no exception. Although most textbooks confidently state that Winogradsky discovered the first free-living microorganism able to use molecular nitrogen, others had paved the way for this noteworthy finding. As early as 1862 Jodin (Stephenson 1949)1 had noted that a vigorous growth of “mycoderms” occurred in a solution containing only minerals and a source of carbon. Even more remarkable, he established an actual loss of N2 from the atmosphere—an analytical precaution neglected by many a subsequent investigator. Berthelot in 1885 demonstrated by chemical analysis a rise in the nitrogen content of soil enclosed in pots. In his initial memoir published in 1895 (Winogradsky 1949) as well as in his Avant-Propos to the subject written in 1945, Winogradsky specifically rejects Berthelot’s claims of priority of discovery insofar as bacteria are concerned.