Researchers have engineered strains of the ubiquitous, nitrogen-fixing soil bacterium Azotobacter vinelandii to produce ammonia and excrete it at high concentrations, transferring it into crop plants ...
Mortenson, L. E., The Bacteria, 3, 119, edit. by Gunsalus, I. C., and Stanier, R. Y. (Academic Press, New York, 1962).
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