what is nitrogen? nitrogen makes up about 78% of our atmosphere. nitrogen in the atmosphere it is...
TRANSCRIPT
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 ______________________.
N2
Nitrogen Cycle
Why we care about nitrogen…
Nitrogen is an essential component of
_____________________.The building blocks of life.
DNA, RNA and Proteins
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!
Nitrogen Cycle
(1) Nitrogen Fixation
(2) Ammonification(3) Nitrification
(4) Denitrification
Four
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 _______________.
NN
H
NHH
N2
Nitrogen Fixation
“fixed”
hydrogen oxygen
Ammonia (NH3) Nitrous Oxide (N2O)
Three ways to “fix” NitrogenMain 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 (Fertilizer)
bacteria
some
Lightning
Chemical
Process 2: Ammonification_____________________ - After all the living organisms have used the ___________________, decomposer bacteria convert the nitrogen to _______________.
N
H
H
H
Ammonificationorganic nitrogen
ammonia
Bacteria Ammonia
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?
_____________________N
N
NH
H
H
O O
O
O O
Nitrification
mostcan
Both
Bacteria!
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.
N2ONO3
N2
Denitrificationconvert back
bacteriaburning
Nitrogen Cycle
(4) Denitrification
(1) Nitrogen Fixation
(2) Ammonification
Nitrates in Soil Organic nitrogen is converted to ammonia.
N2
NH3
NO3
N2O
Ammonia is converted to nitrites and nitrates.
(3) Nitrification
Nitrogen inthe air
animal protein
dead plants & animalsurine & feces
ammonia
nitrites
nitrates
plant madeprotein
decomposition by bacteria & fungi
bacteria
(nitrifying bacteria)
nitrates absorbed
denitrifyingbacteria
root nodules(containing nitrogen fixing bacteria)
nitrogen fixing planteg pea, clover
bacteria
Human Impact___________________, releases toxic nitrogen compounds into the atmosphere.____________________________ release 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.
Combustion
Commercial Fertilizers
mineral deposits
municipal sewage
Commercial Fertilizers
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 apply about ___________________ as they need.
Extra nitrogen disrupts the ________________.
#1
limiting factor
twice as much
food chain
CFA1. What are the four main processes of the
nitrogen cycle?
2. What is it called when bacteria convert nitrogen into ammonia?
3. What organism is required for every step of the nitrogen cycle?