The nitrogen cycle is a biogeochemical process whereby nitrogen is converted into multiple forms and continually transferred between the atmosphere, terrestrial and marine ecosystems, and soil. It involves nitrogen fixation, ammonification, nitrification, assimilation, and denitrification. The nitrogen cycle is important as it makes nitrogen available to plants in a form they can absorb and use to synthesize chlorophyll. However, human activities like burning fossil fuels and excessive application of nitrogen fertilizers can disrupt the nitrogen cycle and harm ecosystems by increasing biologically available nitrogen levels.

1. Nitrogen
Cycle
Group 3 : Fazzah, Amelie & Jiehan

2. — Rob Nixon
“We have decisively changed
the carbon cycle, the nitrogen
cycle, and the rate of
extinction”

3. Table of contents
Introduction
Introduction of nitrogen
cycle
The nitrogen cycle
Process of nitrogen cycle
Human effect
The effect of humans to the
nitrogen cycle
Example
Example of when nitrogen
cycle is used
The benefit
The benefit of nitrogen cycle
and why it is important
01 02 03
04 05

4. Introduction to Nitrogen
Nitrogen (N) is a colorless and odorless element. The
soil, water and air are all made of nitrogen! The
atmosphere contains 78% of nitrogen!

5. Introduction
01
What is nitrogen cycle?

6. Nitrogen cycle is a biogeochemical process in which the
nitrogen converts into many forms and it is consistently
passing from the the atmosphere to the non-living
organism and living organisms and back into the
atmosphere.
What is nitrogen cycle?

7. The nitrogen
cycle
02
The process of nitrogen cycle

8. First the nitrogen from the
atmosphere goes through
fixation then it goes through
ammonification, then
nitrification, and the nitrate will
go through assimilation and
lastly denitrification.
Process of nitrogen cycle

9. The definition
1. Fixation: a process that causes free nitrogen to combine chemically with other
elements to form more-reactive nitrogen compounds such as ammonia, nitrates, or
nitrites. nitrogen cycle.
2. Ammonification: The process where when an organism excretes waste or dies, the
nitrogen in its tissues is in the form of organic nitrogen (e.g. amino acids, DNA).
3. Nitrification: The process by which bacteria in soil and water oxidize ammonia and
ammonium ions and form nitrites and nitrates.
4. Assimilation: the process by which inorganic nitrogen compounds are used to form
organic nitrogen compounds
5. Denitrification: the microbial process of reducing nitrate and nitrite to gaseous forms of
nitrogen.

10. The benefit
03
The benefit of nitrogen cycle and why it is important

11. What is the
benefit of
Nitrogen cycle?
The benefits of nitrogen cycle is to help the synthesis chlorophyll
from the nitrogen. Nitrogen gas can converting into a usable form
for the plants by the biochemical process.

12. Why is it
important?
The importance of Nitrogen cycle is to help in converting
inert nitrogen gas into a usable for the plants. The
ammonification process, the bacteria help in decomposing
the animal and plant matter, it could directly help to clean
up the environment easily.

13. Human effect
04
The effect of humans to the nitrogen cycle

14. Human impact on nitrogen cycle
- Burning fossil fuels
- application of nitrogen-based fertilizers
Any activities that can dramatically increase the amount of biologically
available nitrogen in an ecosystem can disrupt the nitrogen cycle.

15. Why disrupting the nitrogen cycle is
harmful?
It is because excess nitrogen that is contributed by human activities can pollute
fresh waters and coastal zone, contribute to climate change Such ecological
damage could be reduced by the adoption of time-honored sustainable practices.

16. Example
05
Example of when nitrogen cycle is used

17. The example of Nitrogen Cycle
The first example
The second example
When plants or a animals die,
the organic nitrogen is
released. The bacteria able are
organic into ammonium. This
process is called
mineralization.
Plant take nitrogen from the
soil and absorb through the
roots
The third example
The nitrogen get into the ocean and
the result of the runoff from the
ground water or i will be rains

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