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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 ... 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.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.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 ... By what process is atmospheric molecular nitrogen converted into a form that plants  ...

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 ...

environ.andrew.cmu.edu/m3/s4/cycleNitro.shtml

Seventy-nine percent of the atmosphere is nitrogen in the form of N2 gas. ... This process of conversion is called nitrogen fixation, and makes the nitrogen ... Plants can not use N2, and the N2 can therefore escape into the atmosphere. Farmers ...

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.

www.lenntech.com/nitrogen-cycle.htm

Nitrogen in the gaseous form cannot be absorbed and used as a nutrient by plants and animals; ... Plants can use ammonia as a nitrogen source. ... bacteria will start a process called ammonification, to convert them back into ammonia and ...

www.conserve-energy-future.com/nitrogen-cycle.php

The nitrogen cycle is split up into five main processes. ... Nitrogen gas cannot be directly used by plants and therefore needs to be converted into nitrate compound by nitrogen fixing ... Nitrogen is found in two major forms in the atmosphere. ... The nitrogen can also be used as energy for these organisms to produce carbon ...