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 ...
The process is called nitrogen fixation.
Soil converts nitrogen into a form plants can use. Nitrates in soil and water are
converted to nitrogen by bacteria, fixed by lightning and released into the air ...
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
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.
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 ...
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
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.