The nitrogen is present in the atmosphere in huge amount but plants fail to utilize it . Why ?

Explanation

Though nitrogen is abundant in atmosphere, plants does not have the ability to directly absorb the molecular nitrogen `(N_2)` in atmosphere. So it has to be converted to absorbable from like nitrates `(NO_3^-)` and nitrates `(NO_2^-)` by nitrogen fixation. So that they can be utilised by plants.