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Cody Guenzler, Period 3 Nitrogen Fixation Conversion of Nitrogen Assimilation Ammonification Nitrification Denitrification
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Nitrogen Fixation During this phase, the atmospheric nitrogen is processes to be use by plants. Most of the fixation is done by free-living bacteria. The bacteria combines gaseous nitrogen with hydrogen to produce ammonia which is then converted to make organic compounds.
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Conversion of Nitrogen The conversion of nitrogen contains four ways to convert nitrogen into more chemically reactive forms. 1.Biological fixation Fixation from free-living bacteria 2.Industrial N-fixation Great pressure, heat of 600 o C, and the use of an iron catalyst 3.Combustion of fossil fuels Release of nitrogen oxides 4.Other processes Lightning stikes
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Assimilation At this phase, plants absorb nitrogen from the soil through their roots in forms of either nitrate ions or ammonium ions. All nitrogen that are collected by animals can be traced back to the eating of plants at some point in the food chain.
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Ammonification At this point, when a plant or animal dies, the initial form of the nitrogen is organic. Bacteria converts the organic nitrogen from the remains back to ammonium through the process called mineralization.
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Nitrification This is the conversion of ammonia to nitrate by soil- living bacteria and other nitrifying bacteria. In nitrification, ammonium is oxidized by bacteria which converts ammonia to nitrites.
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Denitrification Denitrification is the reduction of nitrates back to a large amount of inert nitrogen gas and completing the nitrogen cycle.
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