What is Nitrogen?
Nitrogen makes up about 78%
of our atmosphere.
Nitrogen in the atmosphere it is mostly in the
N2
form ...
Why we care about nitrogen…
Nitrogen is an essential
component of
DNA, RNA and Proteins
_____________________.
The buildin...
How does atmospheric nitrogen (N2) get
changed into a form that can be used by
most living organisms?
Four
By traveling th...
Process 1: Nitrogen Fixation
Nitrogen Fixation
___________________ is the process in
which the N2 compound in the atmosphe...
Three ways to “fix” Nitrogen
bacteria
Main process: Special ____________
convert the nitrogen gas (N2) to
some
ammonia (N...
Process 2: Ammonification
Ammonification
_____________________ - After all the living
organic nitrogen
organisms have used...
Process 3: Nitrification
Nitrification
_______________ is the process that
converts ammonia (NH3) into nitrites
most
(NO2)...
Process 4: Denitrification

Denitrification
_______________: Process in which nitrogen
convert back
compounds ____________...
N2
N2O

(1) Nitrogen Fixation

(4) Denitrification

Nitrogen
Cycle

(2) Ammonification

(3) Nitrification
Ammonia is conve...
Nitrogen in
the air
nitrogen fixing
plant
eg pea, clover plant made

animal protein

protein

root nodules
(containing nit...
Human Impact
Combustion
___________________, releases toxic nitrogen
compounds into the atmosphere.
Commercial Fertilizer...
Commercial Fertilizers
Are the ______ contributor of new nitrogen in
#1
the nitrogen cycle.
limiting factor
Added becaus...
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Nitrogen cycle

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Nitrogen cycle

  1. 1. What is Nitrogen? Nitrogen makes up about 78% of our atmosphere. Nitrogen in the atmosphere it is mostly in the N2 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 Nitrogen Cycle animals is called the ______________________.
  2. 2. Why we care about nitrogen… Nitrogen is an essential component of DNA, RNA and Proteins _____________________. The building blocks of life.
  3. 3. How does atmospheric nitrogen (N2) get changed into a form that can be used by most living organisms? Four By traveling through one of the ________ processes in the Nitrogen Cycle! (1) Nitrogen Fixation (4) Denitrification Nitrogen Cycle (3) Nitrification (2) Ammonification
  4. 4. Process 1: Nitrogen Fixation Nitrogen Fixation ___________________ is the process in which the N2 compound in the atmosphere breaks and combines with other compounds. “fixed” The nitrogen is _________ when it combines hydrogen oxyge with ______________ or _______________. n N H H N N N2 H Ammonia (NH3) Nitrous Oxide (N2O)
  5. 5. Three ways to “fix” Nitrogen bacteria Main process: Special ____________ convert the nitrogen gas (N2) to some ammonia (NH3), which only ________ plants can use (peas, beans). Lightning _________________ strikes convert N2 to N2O or NO3. Chemical Industrial production. ____________ manipulation turns N2 into NH3 (Fertilizer)
  6. 6. Process 2: Ammonification Ammonification _____________________ - After all the living organic nitrogen organisms have used the ___________________, decomposer bacteria convert the nitrogen to ammonia _______________. H N H Bacteria Organic Nitrogen (proteins) H Ammonia
  7. 7. Process 3: Nitrification Nitrification _______________ is the process that converts ammonia (NH3) into nitrites most (NO2) and nitrates (NO3) which ____ can plants _______ use. Both Note: Ammonia comes from ______ nitrogen fixation and ammonification How is it done? Bacteria! _____________________ H H O N H N O O O N O
  8. 8. Process 4: Denitrification Denitrification _______________: Process in which nitrogen convert back compounds _____________________ into atmospheric nitrogen (N2 or N2O). The main process is performed by bacteria _____________________ in the soil. It can burning also happen by _____________ fossil fuels. N2 NO3 N2O
  9. 9. N2 N2O (1) Nitrogen Fixation (4) Denitrification Nitrogen Cycle (2) Ammonification (3) Nitrification Ammonia is converted to nitrites and nitrates. NO3 NH3 Nitrates in Soil Organic nitrogen is converted to ammonia.
  10. 10. Nitrogen in the air nitrogen fixing plant eg pea, clover plant made animal protein protein root nodules (containing nitrogen fixing bacteria) denitrifying bacteria nitrates absorbed dead plants & animals urine & feces decomposition by bacteria & fungi nitrates bacteria (nitrifying bacteria) ammonia nitrites bacteria
  11. 11. Human Impact Combustion ___________________, releases toxic nitrogen compounds into the atmosphere. Commercial Fertilizers ____________________________ release nitrous oxide into the atmosphere and introduce excess nitrogen into the environment. Remove nitrogen from the soil when we mine it mineral deposits for nitrogen rich __________________________. Discharge of ___________________________ municipal sewage releases excess nitrogen into the water ecosystems which disrupts the aquatic balance and kills fish.
  12. 12. Commercial Fertilizers Are the ______ contributor of new nitrogen in #1 the nitrogen cycle. limiting factor 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 need. food chain Extra nitrogen disrupts the ________________.

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