what are three ways that nitrogen can be added to soil in an ecosystem?
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In the atmosphere, nitrogen is fixed (i.e. N2 is converted to NH3) in three ways: (1) bacteria, (2) by humans through a manufacturing process called Haber process used in fertilizer production, and (3) through a chemical process initiated by lightning. Certain bacteriaare diazotrophs (or more simply, nitrogen-fixers).
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nitrifiying bacteria in the soil convert ammonia into nitrite and then into nitrate. the process is called nitrification. compound such as nitrate, nitrite, ammonium can be taken up from soils by plants and then used in the formation of plant and animal protein
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