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Nitrogen is Recycled in the Air
Atmosphere contains 78% nitrogen gas
Nitrogen is needed for making proteins for
growth
Plants get nitrogen from soil
Animals get proteins by eating these plants…read more

Slide 3

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Decomposers
Break down proteins in rotting
plants & animals and urea in
animal waste into ammonia ­
nitrogen recycled...…read more

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Nitrogen Fixation
The process of turning N2 from the air into
Nitrogen Compounds that plants can use.
2 Ways this can Occur:
· Lightening ­ energy in this makes nitrogen react
with oxygen in the air to produce nitrates
· Nitrogen-fixing Bacteria in roots and soil…read more

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Bacteria
DECOMPOSERS ­ Decompose proteins and
urea and turn them into ammonia
NITIRFYING BACTERIA ­ Turn ammonia in
decaying matter into nitrates
NITROGEN FIXING BACTERIA ­ turn
atmospheric N2 into Nitrogen compounds
that plants can use
DENITRIFYING BACTERIA ­ turn nitrates
back into N2 gas…read more

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Legume Plants
Some nitrogen-fixing bacteria live in the soil, others
live in nodules on the roots of these plants.
Legume plants are great at putting nitrogen back
into the soil because they have a mutualistic
relationship with the bacteria...
- Bacteria get food
- Plant gets nitrogen compounds…read more

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