- the conversion of atmospheric nitrogen into nitrogenous compounds by bacteria (nitrogen fixers) found in the root nodules of legumes and certain other plants, and in the soil
- the conversion of free nitrogen into nitrogenous compounds of commercial value by any of various processes
nitrogen fixationnitrogen fixation
- The conversion of atmospheric nitrogen into compounds, such as ammonia, by natural agencies or various industrial processes.
- The conversion by certain soil microorganisms, such as rhizobia, of atmospheric nitrogen into compounds that plants and other organisms can assimilate.