The nitrogen cycle
This presentation is the property of its rightful owner.
Sponsored Links
1 / 7

The nitrogen cycle PowerPoint PPT Presentation


  • 107 Views
  • Uploaded on
  • Presentation posted in: General

The nitrogen cycle. Why is the cycle important and what is nitrogen used for?. Not many organisms can use nitrogen directly from the air (78%) Recycling of nitrates allows plants to manufacture proteins for growth. Therefore it is a limiting factor for yield/ dry mass. 4 Main stages.

Download Presentation

The nitrogen cycle

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


The nitrogen cycle

The nitrogen cycle


Why is the cycle important and what is nitrogen used for

Why is the cycle important and what is nitrogen used for?

  • Not many organisms can use nitrogen directly from the air (78%)

  • Recycling of nitrates allows plants to manufacture proteins for growth.

  • Therefore it is a limiting factor for yield/ dry mass


4 main stages

4 Main stages

  • Ammonification- production of ammonia from organic compounds.

  • Nitrification- Conversion of ammonium ions to nitrate ions.

  • Nitrogen fixing:

  • 1) Free living bacteria- nitrogen gas reduced to ammonia.

  • 2) Mutualistic bacteria- symbiotic relationship with plants.

  • Denitrification- Conversion of ammonium ions to gaseous nitrogen.


Non living living stages

Non-living/ living stages

  • Nitrogen in the soil is classed as a non-living phase of the cycle.

  • When ions are absorbed or fixed through nodules into producers, consumers and decomposers the ammonium in the macromolecules becomes part of the living phase.


Final links processes in the cycle

Final links/ processes in the cycle

  • Death and excretion- Saprobiotic organisms break down urea or dead organisms into ammonium ions.

  • Absorption- Nitrate ions actively transported through root hair cells.

  • Feeding- Consumers obtain nitrates from digestion.


Put it all together

Put it all together

Non-living

living

Nitrogen fixing (free living bacteria)

Ammonium ions

Nitrogen in the atmosphere

Nitrite ions

Nitrate ions

Nitrification

De-nitrification

Nitrogen fixation (mutualistic bacteria)

Absorption

Ammonium containing molecules (protein)

Producers

Ammonium containing molecules (protein)

Consumers

Digestion

Death

Death and excretion

Ammonification

Ammonium containing molecules (protein)

Decomposers


Typical questions

Typical questions

  • Where and how does nitrogen entre the living and non-living stages of the nitrogen cycle?

  • How is nitrogen recycled in the nitrogen cycle?

  • Why do farmers achieve a faster rate of crop growth when they plough?


  • Login