How can nitrogen be fixed naturally for plant use?

1 Answer

Nitrogen fixation is a process by which nitrogen in the atmosphere is converted into ammonia.


Nitrogen fixation occurs naturally in the soil by nitrogen fixing bacteria.

Some nitrogen fixing bacteria ( Rhizobia ) have a symbiotic relationship with plants.
Non symbiotic nitrogen fixing by bacteria ( Azospirilum ) also occurs in cases like rice roots.
Prokaryotic micro organisms that can fix nitrogen are called diazotrophs.

All biological nitrogen fixation is done by the enzyme nitrogenase which contains a metallic component ( iron ,molybdenum and vanadium ) .

Nitrogen fixation also occurs naturally in the air by means of lightning.

You can watch a video about nitrogen fixation from Britannica here and read more extensively about biological nitrogen fixation here.