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 ...
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 ...
Jul 30, 2013 ... As a gas, however, nitrogen can't be used by most living things. ... It has to be
converted or 'fixed' to a more usable form through a process called fixation. ...
Animals obtain these compounds when they eat the plants. ... Nitrifying bacteria
in the soil convert ammonia into nitrite (NO2<sup>-</sup>) and then into ni...
Almost all of these forms are used by one type of organism or another, and as
they ... Nitrogen fixation is the conversion of inert dinitrogen gas into a form that
can be ... tissue compounds of photosynthetic organisms: algae and higher
plants. ... is the reduction of living tissue and organic waste to ammonia, a
process that is ...
But most organisms cannot use nitrogen in this form. Plants must secure ... Three
processes are responsible for most of the nitrogen fixation in the biosphere:
atmospheric ... Ammonia can be taken up directly by plants — usually through
their roots. However, most of the ammonia produced by decay is converted into
The problem is that green plants can't use the nitrogen that's free in the
atmosphere. ... The process of chemically altering unusable, free atmospheric
nitrogen into a form usable by organisms is referred to as nitrogen fixation. ... The
process of converting ammonia to nitrate, called nitrification, is usually
Plants normally use nitrogen in only the ammonium and nitrate forms. ... Bacteria
can convert nitrogen to organic forms through fixation. ... Moisture and oxygen
are necessary for microbial function in both the mineralization and nitrification
processes. .... When a plant residue with a wide C:N ratio is incorporated into the
Denitrification: Conversion of nitrate to atmospheric forms of nitrogen ... Organic
nitrogen must be converted to ammonium before it is used by plants. ... In the soil,
nitrogen fixating organisms can form special relationships with plants, called ... is
necessary to convert N2 gas into ammonium through this biological process.
Feb 10, 2013 ... As a result, nitrogen is most often utilized by organisms in the form ... Atmospheric
nitrogen can be converted into the nitrates, the usable form of nitrogen. ... into
nitrates and ammonium ions, which can then be used by plants.
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 ...