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 ...
Nitrogen in the gaseous form cannot be absorbed and used as a nutrient by
plants and ... Plants can use ammonia as a nitrogen source. ... anaerobic bacteria
will convert them back into nitrogen gas, during a process called denitrification.
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 ... The
fixation of nitrogen, in which the gaseous form dinitrogen, N2) is converted into
forms ... it to an inorganic form (usually ammonium, NH4<sup>+</sup>) that plants can use.
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
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
Soil nitrogen exists in three general forms: organic nitrogen compounds,
ammonium ... This nitrogen is not directly available to plants, but some can be
converted to ... grouped into a system called the nitrogen cycle, which can be
presented in ... The quantity of inorganic nitrogen available for crop use often
depends on the ...
Denitrification: Conversion of nitrate to atmospheric forms of nitrogen ...
Ammonium can escape from the surface of the soil under certain conditions and
is harmful ... Organic nitrogen must be converted to ammonium before it is used
by plants. ... is necessary to convert N2 gas into ammonium through this
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 ...
Nitrogen fixation is the process wherein N2 is converted to ammonium, or NH4<sup>+</sup>.
... Once in the form of ammonium, nitrogen is available for use by plants or for
further ... Eventually, this atmospheric nitrogen can be blown into nitrogen-