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en.wikipedia.org/wiki/Nitrogen_cycle

The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into various chemical forms as it circulates among the atmosphere and terrestrial and marine ecosystems. The conversion of nitrogen can be carried out through both biological and ... The processes of the nitrogen cycle transform nitrogen from one form to ...

en.wikipedia.org/wiki/Nitrogen_fixation

Nitrogen fixation is a process by which nitrogen in the Earth's atmosphere is converted into .... Although by far the majority of plant species able to form nitrogen-fixing root nodules are in the legume family Fabaceae, there are exceptions:.

www.boundless.com/microbiology/textbooks/boundless-microbiology-textbook/microbial-ecology-16/nutrient-cycles-195/the-nitrogen-cycle-984-5464

The nitrogen cycle is the process by which nitrogen is converted from organic to inorganic forms; many ... Nitriates are a form of nitrogen that is usable by plants.

www.answers.com/Q/What_is_the_process_of_converting_nitrogen_into_a_form_that_plants_can_use

What converts nitrogen from a form that can be assimilated by plants to N2. ... The process of converting nitrogen into a form plants can use is known as nitrogen ...

www.sciencelearn.org.nz/resources/960-the-nitrogen-cycle

Jul 30, 2013 ... Approximately 78% of the atmosphere is made up of nitrogen gas (N2). ... It has to be converted or 'fixed' to a more usable form through a process called fixation. ... Plants take up nitrogen compounds through their roots.

passel.unl.edu/pages/informationmodule.php?idinformationmodule=1130447042&topicorder=2&maxto=8

As described earlier, fixation is the process of converting dinitrogen gas to chemically reactive forms — where nitrogen combines with other elements such as ...

www.cas.miamioh.edu/mbi-ws/biogeochemicalcycles/Nitrogen/nitrogen.htm

Overview: The nitrogen cycle involves three major steps: nitrogen fixation, ... These organisms convert nitrogen in the soil to ammonia, which can then be taken ... the form of nitrates while animals assimilate their nitrogen by eating the plants.

www.siue.edu/~rbrugam/Nitrogen.pdf

Step 2- Nitrification- Nitrification is the process which converts the ammonia into nitrite ions which the plants can take in as ... Nitric Oxide (NO) is released into the atmosphere when any type of fuel is ... Plants lacking sufficient nitrogen become.

www.fondriest.com/news/nitrogencycle.htm

Aug 2, 2010 ... The cycling of nitrogen among its many forms is a complex process that ... Nitrogen fixation is the process by which gaseous nitrogen (N2) is converted to ... Plants take up these forms of nitrogen through their roots, and ...

tolweb.org/notes/?note_id=3920

The process of biological nitrogen fixation was discovered by the Dutch ... Plants cannot fix nitrogen on their own, but need it in one form or another to make ... in this cycle converting nitrogen containing compounds to ammonia, NH3, nitrates,  ...