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Unit 5
Lesson 11
Plant and Soil Science
The Nitrogen Cycle
PSS.HO.1
Nitrogen cycle
Nitrogen fixation
Nitrogen-fixing bacteria
Ammonification
Nitrification
Denitrification
PSS.HO.2
The pathway that nitrogen follows within an
ecosystem
The process by which gaseous nitrogen in the air is
converted into ammonia
Lives in the roots of legumes and convert
atmospheric nitrogen into ammonia
In the nitrogen cycle the formation of ammonia
compounds
The process in the nitrogen cycle by which nitrites
and nitrates are produced
A final step in the nitrogen cycle, during which
nitrogen gas is returned to the atmosphere
PSS.PP.1