Summary and conclusions
Though the discovery of molybdenum as an element necessary for the growth ofAzotobacter enables us to cultivate this organism in a purely synthetic medium, free of combined nitrogen, the optimal medium for its development is not known as yet. Evidence is given that organic matter of the soil if highly favourable.
Molybdenum acts as a reductor in the assimilation of atmospheric nitrogen. For the reduction of nitrate nitrogen there is needed less Mo than for the reduction of free nitrogen.
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Burema, S.J., Wieringa, K.T. Molybdenum as a growth factor ofAzotobacter chroococcum . Antonie van Leeuwenhoek 8, 123–133 (1942). https://doi.org/10.1007/BF02272772
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DOI: https://doi.org/10.1007/BF02272772