what are the main Headings of nitrogen cycle?

1.	what are the main Headings of nitrogen cycle?
Answer» Nitrogen is present in the environment in a wide variety of chemical forms including organic nitrogen,ammonium(NH+4),nitrite(NO−2),nitrate(NO−3),nitrous oxide,(N2O),nitric oxide(NO) or inorganic nitrogen gas (N2). Organic nitrogen may be in the form of a living organism,humusor in the intermediate products of organic matter decomposition. The processes in the nitrogen cycle is to transform nitrogen from one form to another. Many of those processes are carried out bymicrobes, either in their effort to harvest energy or to accumulate nitrogen in a form needed for their growth. For example, thenitrogenous wastesin animalurineare broken down bynitrifying bacteriain the soil to be used as new. The diagram {besides} alongside shows how these processes fit together to form the nitrogen cycle

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