What will happen if nitrogen fixation does not take place?

If nitrogen fixation does not take place it will disturb the nitrogen cycle.

Plants will not grow if all the nitrogen from the soil is exhausted as they will not get nitrogen from the soil to grow thus creating a barren landscap.Entire food chain will be disturbed as herbivores will not have plants to eat so they will die and in turn carnivores will die because they wont have any herbivores to feed on. If all the carnivores will die in an ecosystem, humans will also not get food, neither products from plants nor food from animal flesh.