What is Nitrogen?
Nitrogen makes up about 78%
of our atmosphere.
Nitrogen in the atmosphere it is mostly in the
form of ______, which is a compound that plants
and animals cannot use.
The process of converting nitrogen into
compounds that can be used by plants and
animals is called the ______________________.
Why we care about nitrogen…
Nitrogen is an essential
DNA, RNA and Proteins
The building blocks of life.
How does atmospheric nitrogen (N2) get
changed into a form that can be used by
most living organisms?
By traveling through one of the ________
processes in the Nitrogen Cycle!
(1) Nitrogen Fixation
Process 1: Nitrogen Fixation
___________________ is the process in
which the N2 compound in the atmosphere
breaks and combines with other compounds.
The nitrogen is _________ when it combines
with ______________ or _______________.
Nitrous Oxide (N2O)
Three ways to “fix” Nitrogen
Main process: Special ____________
convert the nitrogen gas (N2) to
ammonia (NH3), which only ________
plants can use (peas, beans).
_________________ strikes convert
N2 to N2O or NO3.
Industrial production. ____________
manipulation turns N2 into NH3
Process 2: Ammonification
_____________________ - After all the living
organisms have used the ___________________,
decomposer bacteria convert the nitrogen to
Organic Nitrogen (proteins)
Process 3: Nitrification
_______________ is the process that
converts ammonia (NH3) into nitrites
(NO2) and nitrates (NO3) which ____
plants _______ use.
Note: Ammonia comes from ______
nitrogen fixation and ammonification
How is it done?
Process 4: Denitrification
_______________: Process in which nitrogen
compounds _____________________ into
atmospheric nitrogen (N2 or N2O).
The main process is performed by
_____________________ in the soil. It can
also happen by _____________ fossil fuels.
(1) Nitrogen Fixation
Ammonia is converted
to nitrites and nitrates.
Nitrates in Soil
Organic nitrogen is
converted to ammonia.
eg pea, clover plant made
dead plants & animals
urine & feces
decomposition by bacteria & fungi
___________________, releases toxic nitrogen
compounds into the atmosphere.
nitrous oxide into the atmosphere and introduce
excess nitrogen into the environment.
Remove nitrogen from the soil when we mine it
for nitrogen rich __________________________.
Discharge of ___________________________
releases excess nitrogen into the water ecosystems
which disrupts the aquatic balance and kills fish.
Are the ______ contributor of new nitrogen in
the nitrogen cycle.
Added because nitrogen is a ________________
for plant growth.
Problems: hard to apply fertilizer and keep it in
one area. Runoff, evaporation, etc.. So farmers
twice as much
apply about ___________________ as they
Extra nitrogen disrupts the ________________.