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nitrification    
n. 氮化合,氮饱和,硝化作用

氮化合,氮饱和,硝化作用

nitrification
n 1: the chemical process in which a nitro group is added to an
organic compound (or substituted for another group in an
organic compound)
2: the oxidation of ammonium compounds in dead organic material
into nitrates and nitrites by soil bacteria (making nitrogen
available to plants)

Nitrification \Ni`tri*fi*ca"tion\, n. [Cf. F. nitrification. see
{Nitrify}.]
1. (Chem.)
(a) The act, process, or result of combining with nitrogen
or some of its compounds.
(b) The act or process of oxidizing nitrogen or its
compounds so as to form nitrous or nitric acid.
[1913 Webster]

2. A process of oxidation, in which nitrogenous vegetable and
animal matter in the presence of air, moisture, and some
basic substances, as lime or alkali carbonate, is
converted into nitrates.
[1913 Webster]

Note: The process is going on at all times in porous soils
and in water contaminated with nitrogenous matter, and
is supposed to be due to the presence of a bacteria,
such as members of the genus {Azotobacter}, formerly
called nitrification ferments. In former times the
process was extensively made use of in the production
of saltpeter.
[1913 Webster PJC]


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