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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 ...

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 ... Nitrogen is converted from atmospheric nitrogen (N2) into usable forms, such as ... to use atmospheric nitrogen (N2), it must be "fixed" or converted into ammonia (NH3). ... This is important because plants can assimilate nitrate into their tissues, and they  ...

www.answers.com/Q/What_is_the_process_of_converting_nitrogen_into_a_form_that_plants_can_use

If nitrogen in the atmosphere is not in a form plants can use how do they get nitrogen what is this process called? they get threw their roots and it is called ...

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. ... this nitrogen to ammonium ions (NH4+), which can be used by plants. ... Nitrifying bacteria in the soil convert ammonia into nitrite (NO2-) and ...

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

These organisms convert nitrogen in the soil to ammonia, which can then be taken up by ... After nitrogen has been fixed, other bacteria convert it into nitrate, in a process ... Plants cannot use the nitrogen in our atmosphere without the assistance of ... Plant roots assimilate Nitrogen mainly in the form of nitrates while animals ...

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

Plants normally use nitrogen in only the ammonium and nitrate forms. ... it through the processes of fixation, mineralization, nitrification, leaching, plant assimilation, ... Bacteria can convert nitrogen to organic forms through fixation. .... or more is adequate to move urea far enough into the soil to minimize volatilization loss.

www.fondriest.com/news/nitrogencycle.htm

Aug 2, 2010 ... N2 can be converted directly into NO3- through processes that exert a tremendous ... A small group of bacteria and cyanobacteria are capable using the ... forms of nitrogen through their roots, and incorporate them into plant ...

www.biology-pages.info/N/NitrogenCycle.html

Plants must secure their nitrogen in "fixed" form, i.e., incorporated in ... Three processes are responsible for most of the nitrogen fixation in the biosphere: ... Ammonia can be used directly as fertilizer, but most of its is further processed to urea and ... However, most of the ammonia produced by decay is converted into nitrates.

www.lenntech.com/nitrogen-cycle.htm

Nitrogen in the gaseous form cannot be absorbed and used as a nutrient by plants and ... Plants can use ammonia as a nitrogen source. ... nitrate during the assimilation process, after which they are converted into nitrogen-containing organic ...

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

into compounds they can use. This process is called ... Step 1- Nitrogen Fixation- Special bacteria convert the nitrogen gas (N2 ) to ammonia (NH3) which the plants can use. ▫. Step 2- Nitrification- Nitrification is the process which converts the ammonia ... Four forms of nitrogen are used as fertilizer: ▫. Nitrate. ▫. Ammonia.