Nitrogen cycle

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Last updated 8:58 AM on 9/6/26
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6 Terms

1
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Nitrogen fixation

certain "nitrogen-fixing bacteria" break the triple bond in nitrogen gas, found in the soil and root nodules (legumes), add hydrogen atoms to form ammonia (NH4+)

<p>certain "nitrogen-fixing bacteria" break the triple bond in nitrogen gas, found in the soil and root nodules (legumes), add hydrogen atoms to form ammonia (NH4+)</p>
2
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Assimilation (of ammonia)

ammonia taken up by plants to make DNA, RNA and proteins, not all absorbed as too much is toxic

3
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Nitrification

conversion of ammonia to nitrates so some plants can assimilate nitrates, done by nitrifying bacteria, add oxygen to ammonia, chemical reaction first converts ammonia to nitrite (NO2-) then to nitrate (NO3-), since oxygen is needed this happens best in well aerated soil

<p>conversion of ammonia to nitrates so some plants can assimilate nitrates, done by nitrifying bacteria, add oxygen to ammonia, chemical reaction first converts ammonia to nitrite (NO2-) then to nitrate (NO3-), since oxygen is needed this happens best in well aerated soil</p>
4
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Assimilation (of nitrates)

nitrates taken up by plants that rejected ammonia assimilation, nitrogen in plants can then be passes on to other living things through food webs

<p>nitrates taken up by plants that rejected ammonia assimilation, nitrogen in plants can then be passes on to other living things through food webs</p>
5
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Ammonification

process where all living things die and decompose, returning nitrogen to the soil as ammonia

<p>process where all living things die and decompose, returning nitrogen to the soil as ammonia</p>
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Denitrification

done by denitrifying bacteria, which converts nitrates into nitrogen gas again, this happens best in low-oxygen environments like water logged soil, which reduces fertility in soil

<p>done by denitrifying bacteria, which converts nitrates into nitrogen gas again, this happens best in low-oxygen environments like water logged soil, which reduces fertility in soil</p>