Question

explain the nitrogen cycle briefly......​

Answer 1

The atmosphere contains mainly nitrogen. in fact, the percentage of nitrogen in the air is 78%.

1) atmospheric nitrogen is converted into nitrates in the soil by nitrogen fixing bacteria present in the root nodules of leguminous plants

2)nitrogen fixing bacteria present freely in the soil convert atmospheric nitrogen into ammonia in the soil

3)nitrates in the soil are assimilated (absorbed or taken up) by plants

4) plants are eaten by animals

5) when plants and animals die or excrete, the nitrates and ammonia go back into the soil

6) denitrifying bacteria converts nitrates in the soil back into atmospheric nitrogen and thus the cycle continues

7)NOTE- atmospheric nitrogen can also be converted into nitrates in the soil by lightening storms. lightening creates so much energy in the atmosphere that the atmospheric nitrogen reacts and enters the soil as nitrates