Question

What is the difference between nitrogen fixation and nitrogen assimilation?
Describe in brief the process of abiological nitrogen fixation.

Answer 1

Answer:

Nitrogen Fixation is the fixing of atmospheric nitrogen to Ammonium ions by free-living azotobacter bacteria or mutualistic rhizobium bacteria. Nitrification is the conversion of Ammonium ions to Nitrate ions for assimilation by plants. ... Nitrification is an important step in the nitrogen cycle in soil.

Answer 2

1. Nitrogen fixation:

It is a process by which molecular nitrogen in the air is converted into ammonia or other nitrogenous compounds in soil. It is the most important part of nitrogen cycle responsible for making nitrogen available for plants for their nutrition. This is mainly achieved by means of the nitrogen-fixing soil bacteria like Rhizobium, Azotobacter, etc.

2. Nitrogen assimilation:

It is the process by which plants take up the fixed nitrogen from the soil for their growth and other functions.

3. Abiological (abiotic) nitrogen fixation

• Lightning: This is a natural process when nitrogen in the atmosphere combines with oxygen to form oxides of nitrogen. These oxides trickle down along with rain water making them available in the soil.

• Ultraviolet radiation: In the presence of UV rays some molecular nitrogen reacts with water vapour to produce ammonia and hydrazine.

• Haber-Bosch process: This is an industrial process in which synthetic ammonia is produced from a mixture of nitrogen and hydrogen in the presence of a catalyst (iron oxides) at a very high temperature and pressure.

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