Atmosphere is the main source of nitrogen .Due to various processes ,it is available to the plants and animals .Due to the high temperature released during lighting , nitrogen and oxygen of Atmosphere combine together to form nitrous oxide and nitric oxide .These oxides of nitrogen dissolve in rain water and formation of nitrous and nitric acid take palace .When these acids come down to the earth ,they react with different salts present in the soil and nitrates are formed .Similarly ,Nitrogen fixing bacteria convert the Atmosphere nitrogen to nitrate azotobactek ,Alostridium ,Rhradosprillium etc . are some examples of nitrogen fixing bacteria . The bodies of plants and animals contain plenty of protein .After the death of plants and animals , fungi and bacteria start to decompose the protein found in these dead bodies ,ammonia gas is formed . This process is called ammonofication .With help of nitrifying bacteria ,these salts and nitrate bacteria ,these salts and compounds will be converted into nitrate bacteria are two types of nitrifying bacteria. Thus the process of converting ammonia or ammonium compounds to available formed nitrate by nitrification .The nitrogen thus released is mixed in the Atmosphere Plants absorb required amount of nitrogen by their roots . After absorbing nitrate ,plants convert it into ammonia .The nitrogen released in this process is mixed to the Atmosphere .A kind of free living bacteria is found in the soil ,which is known as denitrifying .These bacteria action the soil nitrate converting it in to nitrogen nitrous oxide ,ammonia ,oxygen etc. This process is known as denitrification. In this way , the nitrogen cycle is maintained in nature .
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