Question

how do nitrogen cycle occure​

Answer 1

Atmospheric nitrogen occurs primarily in an inert form (N2) that few organisms can use; therefore it must be converted to an organic – or fixed – form in a process called nitrogen fixation. ... First, nitrogen is deposited from the atmosphere into soils and surface waters, mainly through precipitation.

Answer 2

Nitrogen cycle consists of four main steps namely:

Nitrogen Fixation

Ammonification/ Decay

Nitrification

De-nitrification

Nitrofen Fixation:

This is the first step of the nitrogen cycle. This step is characterised by the conversion of atmospheric N2 into ammonia (NH3). Bacteria like Azotobacter and Rhizobium have a major role in this process. They are harbored in the roots of the leguminous plants and help convert inert nitrogen to ammonia. Nitrogen fixation can occur in any of the following ways: atmospheric fixation (involves lightening), industrial fixation(manufacturing ammonia under high temperature and pressure condition).

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