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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, 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 ...

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.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.

www.answers.com/Q/What_is_the_process_of_converting_nitrogen_into_a_form_that_plants_can_use

The process of converting nitrogen into a form plants can use is known as nitrogen? ... The conversion of nitrogen (N2) from the atmosphere into a form readily ...

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.

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.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 ... Plants lacking sufficient nitrogen become yellow and ... Four forms of nitrogen are used as fertilizer: ▫. Nitrate. ▫.

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 ...

www.scienceclarified.com/Mu-Oi/Nitrogen-Cycle.html

The problem is, however, that plants are unable to use nitrogen in its elemental form—as dinitrogen. Any process by which elemental dinitrogen is converted to a  ...