There is about 78% loss of nitrogen in our atmosphere. Nitrogen is an important constituent of proteins, nucleic acids (DNA and RNA) and some vitamins, which are important for organisms. It is also present in biologically important compounds urea and alkali. Nitrogen is essential for all living things, and all organisms are still living simply if they cannot use nitrogen directly in the organism’s atmosphere. Except for certain types of bacteria, no living organism is capable of converting nitrogen into nitrate and nitrite, as in the atmosphere. These nitrogen fixing bacteria live independently or in association with some species oaf legumes. Very often nitrogen fixation bacteria are found in the root structures of the roots of legume plants, such as the root hours.
In addition to these bacteria, nitrogen is converted to nitrate and nitrite, by physical means only, when lightning occurs in the atmosphere at high pressure and temperature, nitrogen and nitrogen are converted to oxides. It dissolves in rain water and falls to the ground with rain water as nitrous acid and nitric acid. It is later used by many living beings.
Nitrogen once converted into usable nitrogenous molecules. What happens? Plants usually convert them into amino acids using nitrates and nitrites. These amino acids are used for the production of proteins. In many other biochemical processes, it is used to form complex nitrogen compounds. Animals consume these proteins and complex nitrogen compounds. After the plant or animal dies, some bacteria turn the nitrogen compounds back into nitrates and nitrites. Many other bacteria then convert nitrates and nitrites into nitrogen.
In this way, nitrogen in the atmosphere in the nitrogen cycle, from the basic form into simple molecules of water and soil, then converted into complex molecules in the body of the organism and returned to the atmosphere as simple nitrogen.
Source-Internet
